|Nipah virus in the blood vessel of a pig's lung|
|Group:||Group V ((-)ssRNA)|
Henipavirus is a genus of the family Paramyxoviridae, order Mononegavirales containing three established species: Hendra virus, Nipah virus and Cedar Virus. The henipaviruses are naturally harboured by Pteropid fruit bats (flying foxes) and some microbat species. Henipavirus is characterised by a large genome, a wide host range, and their recent emergence as zoonotic pathogens capable of causing illness and death in domestic animals and humans.
In 2009, RNA sequences of three novel viruses in phylogenetic relationship to known Henipaviruses were detected in Eidolon helvum (the African Straw-coloured fruit bat) in Ghana. The finding of these novel putative Henipaviruses outside Australia and Asia indicates that the region of potential endemicity of Henipaviruses extends to Africa.
- 1 Virus structure
- 2 Genome structure
- 3 Hendra virus
- 4 Nipah virus
- 5 Cedar virus
- 6 Causes of emergence
- 7 See also
- 8 References
- 9 External links
Henipaviruses are pleomorphic (variably shaped), ranging in size from 40 to 600 nm in diameter. They possess a lipid membrane overlying a shell of viral matrix protein. At the core is a single helical strand of genomic RNA tightly bound to N (nucleocapsid) protein and associated with the L (large) and P (phosphoprotein) proteins, which provide RNA polymerase activity during replication.
Embedded within the lipid membrane are spikes of F (fusion) protein trimers and G (attachment) protein tetramers. The function of the G protein is to attach the virus to the surface of a host cell via EFNB2, a highly conserved protein present in many mammals. The F protein fuses the viral membrane with the host cell membrane, releasing the virion contents into the cell. It also causes infected cells to fuse with neighbouring cells to form large, multinucleated syncytia.
As with all viruses in the Mononegavirales order, the Hendra virus and Nipah virus genomes are non-segmented, single-stranded negative-sense RNA. Both genomes are 18.2 kb in size and contain six genes corresponding to six structural proteins.
In common with other members of the Paramyxovirinae subfamily, the number of nucleotides in the henipavirus genome is a multiple of six, consistent with what is known as the 'rule of six'. Deviation from the rule of six, through mutation or incomplete genome synthesis, leads to inefficient viral replication, probably due to structural constraints imposed by the binding between the RNA and the N protein.
Henipaviruses employ an unusual process called RNA editing to generate multiple proteins from a single gene. The specific process in henipaviruses involves the insertion of extra guanosine residues into the P gene mRNA prior to translation. The number of residues added determines whether the P, V or W proteins are synthesised. The functions of the V and W proteins are unknown, but they may be involved in disrupting host antiviral mechanisms.
Hendra virus (originally Equine morbillivirus) was discovered in September 1994 when it caused the deaths of thirteen horses, and a trainer at a training complex in Hendra, a suburb of Brisbane in Queensland, Australia.
The index case, a mare, was housed with 19 other horses after falling ill, and died two days later. Subsequently, all of the horses became ill, with 13 dying. The remaining 6 animals were subsequently euthanised as a way of preventing relapsing infection and possible further transmission. The trainer, Victory ('Vic') Rail, and a stable hand were involved in nursing the index case, and both fell ill with an influenza-like illness within one week of the first horse’s death. The stable hand recovered while Mr Rail died of respiratory and renal failure. The source of the virus was most likely frothy nasal discharge from the index case.
A second outbreak occurred in August 1994 (chronologically preceding the first outbreak) in Mackay 1,000 km north of Brisbane resulting in the deaths of two horses and their owner. The owner, Mark Preston, assisted in necropsies of the horses and within three weeks was admitted to hospital suffering from meningitis. Mr Preston recovered, but 14 months later developed neurologic signs and died. This outbreak was diagnosed retrospectively by the presence of Hendra virus in the brain of the patient.
A survey of wildlife in the outbreak areas was conducted, and identified pteropid fruit bats as the most likely source of Hendra virus, with a seroprevalence of 47%. All of the other 46 species sampled were negative. Virus isolations from the reproductive tract and urine of wild bats indicated that transmission to horses may have occurred via exposure to bat urine or birthing fluids. However, the only attempt at experimental infection reported in the literature, conducted at CSIRO Geelong, did not result in infection of a horse from infected flying foxes. This study looked at potential infection between bats, horses and cats, in various combinations. The only species that was able to infect horses was the cat (Felix spp.).
As of June 2014, a total of fifty outbreaks of Hendra virus have occurred in Australia, all involving infection of horses. As a result of these events, eighty-three horses have died or been euthanised. A further four died or were euthanised as a result of possible hendra infection.
Case fatality rate in humans is 60% and in horses 75%.
Four of these outbreaks have spread to humans as a result of direct contact with infected horses. On 26 July 2011 a dog living on the Mt Alford property was reported to have HeV antibodies, the first time an animal other than a flying fox, horse, or human has tested positive outside an experimental situation.
These events have all been on the east coast of Australia, with the most northern event at Cairns, Queensland and the event furthest south at Kempsey, NSW. Until the event at Chinchilla, Queensland in July 2011, all outbreak sites had been within the distribution of at least two of the four mainland flying foxes (fruit bats); Little red flying fox, (Pteropus scapulatus), black flying fox, (Pteropus alecto), grey-headed flying fox, (Pteropus poliocephalus) and spectacled flying fox, (Pteropus conspicillatus). Chinchilla is considered to be only within the range of little red flying fox and is west of the Great Dividing Range. This is the furthest west the infection has ever been identified in horses.
The timing of incidents indicates a seasonal pattern of outbreaks, possibly related to the breeding cycle of the little red flying foxes. These species typically give birth between April and May. There is no evidence of transmission to humans directly from bats, and, as such it appears that human infection only occurs via an intermediate host, a horse.
Timing of outbreaks also appears more likely during the cooler months when it is possible the temperature and humidity are more favourable to the longer term survival of the virus in the environment.
|List of Australian Hendra outbreaks|
|August 1994||Mackay, Queensland||Death of two horses and one person, Mark Preston.|
|September 1994||Hendra, Queensland||20 horses died or were euthanised. Two people infected, with one death, Victory (Vic) Rail who was a nationally prominent trainer of racing horses.|
|January 1999||Trinity Beach, Cairns, Queensland||Death of one horse.|
|October 2004||Gordonvale, Cairns, Queensland||Death of one horse. A veterinarian involved in autopsy of the horse was infected with Hendra virus, and suffered a mild illness.|
|December 2004||Townsville, Queensland||Death of one horse.|
|June 2006||Peachester, Sunshine Coast, Queensland||Death of one horse.|
|October 2006||Murwillumbah, New South Wales||Death of one horse.|
|July 2007||Peachester, Sunshine Coast, Queensland||Infection of one horse (euthanised)|
|July 2007||Clifton Beach, Cairns, Queensland||Infection of one horse (euthanised).|
|July 2008||Redlands, Brisbane, Queensland||Death of five horses; four died from the Henda virus, the remaining animal recovered but was euthanised because of a government policy that requires all animals with antibodies to be euthanised due to a potential threat to health. Two veterinary workers from the affected property were infected leading to the death of one, veterinary surgeon Ben Cuneen, on 20 August 2008. The second veterinarian was hospitalized after pricking herself with a needle she had used to euthanize the horse that had recovered. A nurse exposed to the disease while assisting Cuneen in caring for the infected horses was also hospitalized. The Biosecurity Queensland website indicates that 8 horses died during this event, however a review of the event indicates that five horses are confirmed to have died from HeV and three of the horses "are regarded as improbable cases of Hendra virus infection ...".|
|July 2008||Proserpine, Queensland||Death of four horses.|
|July 2009||Cawarral, Queensland||Death of four horses. Queensland veterinary surgeon Alister Rodgers tested positive after treating the horses. On 1 September 2009 after two weeks in a coma, he became the fourth person to die from exposure to the virus.|
|September 2009||Bowen, Queensland||Death of two horses.|
|May 2010||Tewantin, Queensland||Death of one horse.|
|20 June 2011 – 31 July 2011||Mt Alford, (near Boonah) Queensland||Death of three horses (all confirmed to have died of Hendra) and sero-conversion of a dog. The first horse death on this property occurred on 20 June 2011, although it was not until after the second death on 1 July 2011 that samples taken from the first animal were tested. The third horse was euthanised on 4 July 2011. On 26 July 2011 a dog from this property was reported to have tested positive for HeV antibodies. Reports indicate that this Australian Kelpie, a family companion, will be euthanised in line with government policy. Biosecurity Queensland suggest the dog most likely was exposed to HeV though one of the sick horses. Dusty was euthanised on 31 July 2011 following a second positive antibody test.|
|26 June 2011||Kerry, Queensland||The horse was moved after it became sick to another property at Beaudesert, Queensland. Death of one horse.|
|28 June 2011||Loganlea, Logan City, Queensland||Death of one horse. Unusually this horse had HeV antibodies present in its blood at the time of death. How this immune response should be interpreted is a matter of debate.|
|29 June 2011||Mcleans Ridges, Wollongbar, New South Wales||Death of one horse. The second horse on the property tested positive to Hendra and was euthanised on 12 July 2011.|
|3 July 2011||Macksville, New South Wales||Death of one horse.|
|4 July 2011||Park Ridge, Logan City, Queensland||Death of one horse.|
|11 July 2011||Kuranda, Queensland||Death of one horse.|
|13 July 2011||Hervey Bay, Queensland||Death of one horse.|
|14 July 2011||Lismore, New South Wales||Death of one horse.|
|15 July 2011||Boondall, Queensland||Death of one horse.|
|22 July 2011||Chinchilla, Queensland||Death of one horse.|
|24 July 2011||Mullumbimby, New South Wales||Death of one horse.|
|13 August 2011||Mullumbimby, New South Wales||Death of one horse. A horse was found dead after being unwell the day before. HeV infection was confirmed on 17 August 2011.|
|15 August 2011||Ballina, New South Wales||Death of one horse.|
|17 August 2011||South Ballina, New South Wales||Death of two horses. The 2 horses were found dead in a field. Both tested positive to HeV. The exact date of death is not known however HeV infection was confirmed on 17 August 2011.|
|23 August 2011||Currumbin Valley, Gold Coast, Queensland||Death of one horse.|
|28 August 2011||North of Ballina, New South Wales||Death of one horse.|
|11 October 2011||Beechmere, Caboolture Queensland||One horse euthanised after testing positive. A horse died one week previous on the property may have died of HeV. On 15 October 2011 another horse on the property was euthanised following a positive HeV antibody test.|
|3 January 2012||Townsville, Queensland||A horse that died or was euthanised on 3 January 2012 returned a positive HeV test on 5 January 2012.|
|26 May 2012||Rockhampton, Queensland||One horse died.|
|28 May 2012||Ingham, Queensland||One horse died. A dog returned a positive test but was subsequently cleared.|
|19 July 2012||Rockhampton, Queensland||One horse died. On 27 July it was announced that two other horses on the property, showing clinical signs of the disease, were euthanised. Two dogs are being assessed, and the property remains quarantined.|
|27 June 2012||Mackay, Queensland||One horse was euthanised after returning a positive HeV test. 15 horses on the property are being tested and quarantined, along with horses on neighbouring properties.|
|27 July 2012||Cairns, Queensland||One horse died.|
|5 September 2012||Port Douglas, Queensland||One horse died. The property with 13 other horses is quarantined.|
|1 November 2012||Ingham, Queensland||One symptomatic horse euthanised; the following day returning a positive HeV test. The property, with seven other horses, quarantined.|
|20 January 2013||Mackay, Queensland||One horse died.|
|19 February 2013||Atherton Tablelands, North Queensland||One horse died. Four horses and four people from the property being assessed.|
|3 June 2013||Macksville, New South Wales||Death of one horse, a second horse vaccinated, 5 cats and a dog being monitored.|
|1 July 2013||Tarampa, Queensland||One horse dies.|
|4 July 2013||Macksville, New South Wales||Six year old gelding died, several other horses, dogs and cats being tested. A dog from this property tested positive for HeV and was euthanised around 19 July 2013 |
|5 July 2013||Gold Coast, Queensland||One horse died, no other horses on property.|
|6 July 2013||Kempsey, New South Wales||Eighteen year old unvaccinated mare died, other animals on property under observation.|
|9 July 2013||Kempsey, New South Wales||Thirteen year old unvaccinated quarterhorse died, other animals on property under observation.|
|18 March 2014||Bundaberg, Queensland||Unvaccinated horse euthanased.|
|1 June 2014||Beenleigh, Queensland||Horse euthanased and property quarantined after outbreak at a property at Beenleigh, south of Brisbane.|
Events of June–August 2011
In the years 1994–2010, fourteen events were recorded. Between 20 June 2011 and 28 August 2011, a further seventeen events were identified, during which twenty-one horses died.
It's not clear why there has been a sudden increase in the number of spillover events between June and August 2011. Typically HeV spillover events are more common between May and October. This time is sometimes called "Hendra Season", which is a time when there are large numbers of fruit bats of all species congregated in SE Queensland's valuable winter foraging habitat. The weather (warm and humid) is favourable to the survival of henipavirus in the environment.
It is possible flooding in SE Queensland and Northern NSW in December 2010 and January 2011 may have had an impact on the health of the fruit bats. Urine sampling in flying fox camps indicate that a larger proportion of flying foxes than usual are shedding live virus. Biosecurity Queensland's ongoing surveillance usually shows 7% of the animals are shedding live virus. In June and July nearly 30% animals have been reported to be shedding live virus. Present advice is that these events are not being driven by any mutation in HeV itself.
Other suggestions include that an increase in testing has led to an increase in detection. As the actual mode of transmission between bats and horses has not been determined, it is not clear what, if any, factors can increase the chance of infection in horses.
Following the confirmation of a dog with HeV antibodies, on 27 July 2011, the Queensland and NSW governments will boost research funding into the Hendra virus by $6 million to be spent by 2014–2015. This money will be used for research into ecological drivers of infection in the bats and the mechanism of virus transmission between bats and other species. A further 6 million dollars was allocated by the federal government with the funds being split, half for human health investigations and half for animal health and biodiversity research.
Prevention, detection and treatment
Three main approaches are currently followed to reduce the risk to humans.
- Vaccine for horses. In November 2012, a vaccine became available for horses. The vaccine is to be used in horses only, since, according to CSIRO veterinary pathologist Dr Deborah Middleton, breaking the transmission cycle from flying foxes to horses prevents it from passing to humans, as well as, "a vaccine for people would take many more years."
- The vaccine is a subunit vaccine that neutralises Hendra virus and is composed of a soluble version of the G surface antigen on Hendra virus and has been successful in ferret models.
- Stall-side test to assist in diagnosing the disease in horses rapidly. Although the research on the Hendra virus detection is ongoing, a promising result has found using antibody-conjugated magnetic particles and quantum dots.
- Post-exposure treatment for humans.
Nipah virus and Hendra virus are closely related paramyxoviruses that emerged from bats during the 1990s to cause deadly outbreaks in humans and domesticated animals. National Institute of Allergy and Infectious Diseases (NIAID)-supported investigators developed vaccines for Nipah and Hendra virus based on the soluble G-glycoproteins of the viruses formulated with adjuvants. Both vaccines have been shown[who?] to induce strong neutralizing antibodies in different laboratory animals.
Flying foxes experimentally infected with the Hendra virus develop a viraemia then excrete the virus in their urine, faeces and saliva for approximately one week. Although they excrete active virus during this time there is no other indication of an illness. Symptoms of Hendra virus infection of humans may be respiratory, including hemorrhage and edema of the lungs, or encephalitic, resulting in meningitis. In horses, infection usually causes pulmonary oedema, congestion and / or neurological signs.
Hendra virus has been classified as a Bio-safety Level 4 Hot Agent.
Nipah virus was identified in April 1999, when it caused an outbreak of neurological and respiratory disease on pig farms in peninsular Malaysia, resulting in 257 human cases, including 105 human deaths and the culling of one million pigs. In Singapore, 11 cases, including one death, occurred in abattoir workers exposed to pigs imported from the affected Malaysian farms. The Nipah virus has been classified by the Centers for Disease Control and Prevention as a Category C agent. The name "Nipah" refers to the place, Kampung Baru Sungai Nipah in Negeri Sembilan State, Malaysia, the source of the human case from which Nipah virus was first isolated.
The outbreak was originally mistaken for Japanese encephalitis (JE), however, physicians in the area noted that persons who had been vaccinated against JE were not protected, and the number of cases among adults was unusual Despite the fact that these observations were recorded in the first month of the outbreak, the Ministry of Health failed to react accordingly, and instead launched a nationwide campaign to educate people on the dangers of JE and its vector, Culex mosquitoes.
Symptoms of infection from the Malaysian outbreak were primarily encephalitic in humans and respiratory in pigs. Later outbreaks have caused respiratory illness in humans, increasing the likelihood of human-to-human transmission and indicating the existence of more dangerous strains of the virus.
Based on seroprevalence data and virus isolations, the primary reservoir for Nipah virus was identified as Pteropid fruit bats, including Pteropus vampyrus (Large Flying Fox), and Pteropus hypomelanus (Small flying fox), both of which occur in Malaysia.
The transmission of Nipah virus from flying foxes to pigs is thought to be due to an increasing overlap between bat habitats and piggeries in peninsular Malaysia. At the index farm, fruit orchards were in close proximity to the piggery, allowing the spillage of urine, faeces and partially eaten fruit onto the pigs. Retrospective studies demonstrate that viral spillover into pigs may have been occurring in Malaysia since 1996 without detection. During 1998, viral spread was aided by the transfer of infected pigs to other farms, where new outbreaks occurred.
Eight more outbreaks of Nipah virus have occurred since 1998, all within Bangladesh and neighbouring parts of India. The outbreak sites lie within the range of Pteropus species (Pteropus giganteus). As with Hendra virus, the timing of the outbreaks indicates a seasonal effect. Cases occurring in Bangladesh during the winters of 2001, 2003, and 2004, were determined to have been caused by the Nipah virus. In February 2011, a Nipah outbreak began at Hatibandha Upazila in the Lalmonirhat District of northern Bangladesh. To date (7 February 2011), there have been 24 cases and 17 deaths in this outbreak.
- 2001 January 31 – 23 February, Siliguri, India: 66 cases with a 74% mortality rate. 75% of patients were either hospital staff or had visited one of the other patients in hospital, indicating person-to-person transmission.
- 2001 April – May, Meherpur District, Bangladesh: 13 cases with nine fatalities (69% mortality).
- 2003 January, Naogaon District, Bangladesh: 12 cases with eight fatalities (67% mortality).
- 2004 January – February, Manikganj and Rajbari districts, Bangladesh: 42 cases with 14 fatalities (33% mortality).
- 2004 19 February – 16 April, Faridpur District, Bangladesh: 36 cases with 27 fatalities (75% mortality). 92% of cases involved close contact with at least one other person infected with Nipah virus. Two cases involved a single short exposure to an ill patient, including a rickshaw driver who transported a patient to hospital. In addition, at least six cases involved acute respiratory distress syndrome, which has not been reported previously for Nipah virus illness in humans. This symptom is likely to have assisted human-to-human transmission through large droplet dispersal.
- 2005 January, Tangail District, Bangladesh: 12 cases with 11 fatalities (92% mortality). The virus was probably contracted from drinking date palm juice contaminated by fruit bat droppings or saliva.
- 2007 February – May, Nadia District, India: up to 50 suspected cases with 3–5 fatalities. The outbreak site borders the Bangladesh district of Kushtia where eight cases of Nipah virus encephalitis with five fatalities occurred during March and April 2007. This was preceded by an outbreak in Thakurgaon during January and February affecting seven people with three deaths. All three outbreaks showed evidence of person-to-person transmission.
- 2008 February – March, Manikganj and Rajbari districts, Bangladesh: Nine cases with eight fatalities.
- 2010 January, Bhanga subdistrict, Faridpur, Bangladesh: Eight cases with seven fatalities. During March, one physician of Faridpur Medical College Hospital caring for confirmed Nipah cases died
- 2011 February: An outbreak of Nipah Virus has occurred at Hatibandha, Lalmonirhat, Bangladesh. The deaths of 21 schoolchildren due to Nipah virus infection were recorded on 4 February 2011. IEDCR has confirmed the infection is due to this virus. Local schools were closed for one week to prevent the spread of the virus. People were also requested to avoid consumption of uncooked fruits and fruit products. Such foods, contaminated with urine or saliva from infected fruit bats, were the most likely source of this outbreak.
Nipah virus has been isolated from Lyle's flying fox (Pteropus lylei) in Cambodia and viral RNA found in urine and saliva from P. lylei and Horsfield's roundleaf bat (Hipposideros larvatus) in Thailand. Infective virus has also been isolated from environmental samples of bat urine and partially eaten fruit in Malaysia. Antibodies to henipaviruses have also been found in fruit bats in Madagascar (Pteropus rufus, Eidolon dupreanum) and Ghana (Eidolon helvum) indicating a wide geographic distribution of the viruses. No infection of humans or other species have been observed in Cambodia, Thailand or Africa thus far.
In humans, the infection presents as fever, headache and drowsiness. Cough, abdominal pain, nausea, vomiting, weakness, problems with swallowing and blurred vision are relatively common. About a quarter of the patients have seizures and about 60% become comatose and might need mechanical ventilation. In patients with severe disease, their conscious state may deteriorate and they may develop severe hypertension, fast heart rate, and very high temperature.
Nipah virus is also known to cause relapse encephalitis. In the initial Malaysian outbreak, a patient presented with relapse encephalitis some 53 months after his initial infection. There is no definitive treatment for Nipah encephalitis, apart from supportive measures, such as mechanical ventilation and prevention of secondary infection. Ribavirin, an antiviral drug, was tested in the Malaysian outbreak, and the results were encouraging, though further studies are still needed.
While no vaccine currently exists, a recent (2012) study of a trial vaccine developed using the outer proteins of Hendra virus was shown to induce protection against Nipah in African Green Monkeys.
In animals, especially in pigs, the virus causes a porcine respiratory and neurologic syndrome, locally known as "barking pig syndrome" or "one mile cough."
In popular culture
In the pilot episode of The Blacklist, Ranko Zamani (Jamie Jackson) has contracted the Nipah virus and wants to launch a chemical weapons attack in Washington D.C. before he dies.
Nipah virus was included as a Scenario in the recent update of Plague Inc.
Cedar Virus (CedPV) was first identified in pteropid urine during work on Hendra virus undertaken in Queensland in 2009.
Although the virus is reported to be very similar to both Hendra and Nipah, it does not cause illness in laboratory animals usually susceptible to paramyxoviruses. Animals were able to mount an effective response and create effective antibodies.
The scientists who identified the virus report:
- Hendra and Nipah viruses are 2 highly pathogenic paramyxoviruses that have emerged from bats within the last two decades. Both are capable of causing fatal disease in both humans and many mammal species. Serological and molecular evidence for henipa-like viruses have been reported from numerous locations including Asia and Africa, however, until now no successful isolation of these viruses have been reported. This paper reports the isolation of a novel paramyxovirus, named Cedar virus, from fruit bats in Australia. Full genome sequencing of this virus suggests a close relationship with the henipaviruses. Antibodies to Cedar virus were shown to cross react with, but not cross neutralize Hendra or Nipah virus. Despite this close relationship, when Cedar virus was tested in experimental challenge models in ferrets and guinea pigs, we identified virus replication and generation of neutralizing antibodies, but no clinical disease was observed. As such, this virus provides a useful reference for future reverse genetics experiments to determine the molecular basis of the pathogenicity of the henipaviruses.
Causes of emergence
The emergence of henipaviruses parallels the emergence of other zoonotic viruses in recent decades. SARS coronavirus, Australian bat lyssavirus, Menangle virus and probably Ebola virus and Marburg virus are also harbored by bats and are capable of infecting a variety of other species. The emergence of each of these viruses has been linked to an increase in contact between bats and humans, sometimes involving an intermediate domestic animal host. The increased contact is driven both by human encroachment into the bats’ territory (in the case of Nipah, specifically pigpens in said territory) and by movement of bats towards human populations due to changes in food distribution and loss of habitat.
There is evidence that habitat loss for flying foxes, both in South Asia and Australia (particularly along the east coast) as well as encroachment of human dwellings and agriculture into the remaining habitats, is creating greater overlap of human and flying fox distributions.
- Li, Y; Wang, J; Hickey, AC; Zhang, Y; Li, Y; Wu, Y; Zhang, Huajun et al. (December 2008). "Antibodies to Nipah or Nipah-like viruses in bats, China [letter]". Emerging Infectious Diseases 14 (12): 1974. doi:10.3201/eid1412.080359. PMID 19046545.
- Sawatsky et al. (2008). "Hendra and Nipah Virus". Animal Viruses: Molecular Biology. Caister Academic Press. ISBN 978-1-904455-22-6.
- Drexler JF, Corman VM, Gloza-Rausch F, Seebens A, Annan A et al. (2009). "Henipavirus RNA in African Bats". In Markotter, Wanda. PLoS ONE 4 (7): e6367. doi:10.1371/journal.pone.0006367.
- Hyatt AD, Zaki SR, Goldsmith CS, Wise TG, Hengstberger SG; Zaki; Goldsmith; Wise; Hengstberger (2001). "Ultrastructure of Hendra virus and Nipah virus within cultured cells and host animals". Microbes and Infection 3 (4): 297–306. doi:10.1016/S1286-4579(01)01383-1. PMID 11334747.
- Bonaparte, M; Dimitrov, A; Bossart, K; (2005). "Ephrin-B2 ligand is a functional receptor for Hendra virus and Nipah virus". Proceedings of the National Academy of Sciences 102 (30): 10652–7. doi:10.1073/pnas.0504887102. PMC 1169237. PMID 15998730.
- Negrete OA, Levroney EL, Aguilar HC et al. (2005). "EphrinB2 is the entry receptor for Nipah virus, an emergent deadly paramyxovirus". Nature 436 (7049): 401–5. doi:10.1038/nature03838. PMID 16007075.
- Wang L, Harcourt BH, Yu M et al. (2001). "Molecular biology of Hendra and Nipah viruses". Microbes and Infection 3 (4): 279–87. doi:10.1016/S1286-4579(01)01381-8. PMID 11334745.
- Kolakofsky, D; Pelet, T; Garcin, D; Hausmann, S; Curran, J; Roux, L (February 1998). "Paramyxovirus RNA synthesis and the requirement for hexamer genome length: the rule of six revisited". Journal of Virology 72 (2): 891–9. PMC 124558. PMID 9444980.
- Selvey LA, Wells RM, McCormack JG et al. (1995). "Infection of humans and horses by a newly described morbillivirus". Medical Journal of Australia 162 (12): 642–5. PMID 7603375.
- "Hendra virus: the initial research". Department of Employmennt, Economic Development, and Innovation, Queensland Primary Industries and Fisheries. Archived from the original on 2009-12-13. Retrieved 27 January 2014.
- Field, H; Young, P; Yob, JM; Mills, J; Hall, L; MacKenzie, J (2001). "The natural history of Hendra and Nipah viruses". Microbes and Infection 3 (4): 307–14. doi:10.1016/S1286-4579(01)01384-3. PMID 11334748.
- Jamie Walker (23 July 2011). "Hendra death toll hits 13 for month". The Australian. Retrieved 24 July 2011.
- Halpin, K; Young, PL; Field, HE; MacKenzie, JS (2000). "Isolation of Hendra virus from pteropid bats: a natural reservoir of Hendra virus". J. Gen. Virol. 81 (8): 1927–32. PMID 10900029.
- Williamson, MM; Hooper, PT; Selleck, PW; Gleeson, LJ; Daniels, PW; Westbury, HA; Murray, PK (December 1998). "Transmission studies of Hendra virus (equine morbillivirus) in fruit bats, horses and cats". Australian Veterinary Journal 76 (12): 813–818. doi:10.1111/j.1751-0813.1998.tb12335.x. PMID 9972433.
- Field, H; de Jong, C; Melville, D; Smith, C; Smith, I; Broos, A; Kung, YH; McLaughlin, A; Zeddeman, A et al. et al. (2011). "Hendra virus infection dynamics in Australian fruit bats". In Fooks, Anthony R. PLoS ONE 6 (12): e28678. Bibcode:2011PLoSO...628678F. doi:10.1371/journal.pone.0028678.
- "Chief vet says dog hendra case 'unprecedented'". 612 ABC Brisbane. 27 July 2011. Retrieved 27 January 2014.
- "Little Red Flying Fox (Pteropus scapulatus)". Wildlife Preservation Society of Queensland. Retrieved 21 May 2014.
- Plowright, RK; Field, H. E. et al. (2008). "Reproduction and nutritional stress are risk factors for Hendra virus infection in little red flying foxes (Pteropus scapulatus)". Proceedings of the Royal Society B: Biological Sciences 275 (1636): 861–869. doi:10.1098/rspb.2007.1260. PMC 2596896. PMID 18198149.
- Selvey L et al. Screening of Bat Carers for Antibodies to Equine Morbillivirus.
- Fogarty, R. Henipavirus susceptibility to environmental variables. Retrieved 27 January 2014.
- Field, HE; Barratt, PC; Hughes, RJ; Shield, J; Sullivan, ND (2000). "A fatal case of Hendra virus infection in a horse in north Queensland: clinical and epidemiological features". Australian Veterinary Journal 78 (4): 279–80. doi:10.1111/j.1751-0813.2000.tb11758.x. PMID 10840578.
- Hanna, JN; McBride, WJ; Brookes, DL (2006). "Hendra virus infection in a veterinarian". Medical Journal of Australia 185 (10): 562–4. PMID 17115969.
- Animal Health Surveillance (NSW Department of Primary Industries) 4: 4–5. 2006.
- ProMED-mail. Hendra virus, human, equine – Australia (Queensland) (03): correction. ProMED-mail 2007; 3 September: 20070903.2896.
- "Queensland vet dies from Hendra virus". Australian Broadcasting Corporation. 21 August 2008.
- Brown, Kimberly S (23 August 2008). "Horses and Human Die in Australia Hendra Outbreak; Government Comes Under Fire". The Horse. Retrieved 26 August 2008..
- "Independent review of Hendra virus cases at Redlands and Proserpine in July and August 2008" AKA the 2008 Perkins Review. Retrieved 30 July 2011.[dead link]
- "Vet tests positive to Hendra virus". The Australian. 20 August 2009. Retrieved 20 August 2009.
- Natasha Bita (2 September 2009). "Alister Rodgers dies of Hendra virus after 2 weeks in coma". The Australian. Retrieved 2 September 2009.
- "Horse dies from Hendra virus in Queensland". news.com.au. 20 May 2010. Retrieved 20 May 2010.
- "Biosecurity Queensland". Facebook. 1 July 2011. Retrieved 21 May 2014.
- "Biosecurity Queensland confirms second Hendra case in South East Queensland". Queensland Department of Agriculture, Fisheries and Forestry. Retrieved 3 July 2011.[dead link]
- "Another confirmed horse with Hendra virus at Mt Alford". Queensland Department of Agriculture, Fisheries and Forestry. 4 July 2011. Retrieved 5 July 2011.
- "Hendra virus infection confirmed in a dog". Facebook. 25 July 2011. Retrieved 26 July 2011.
- Kym Agius; Jessica Marszalek; Petrina Berry (26 July 2011). "Scientists guessing over Hendra dog". The Sydney Morning Herald. Retrieved 26 July 2011.
- Jessica Marszalek (31 July 2011). "Dog put down after more Hendra tests". The Sydney Morning Herald. Australian Associated Press. Retrieved 31 July 2011.
- Marissa Calligeros (29 June 2011). "Eight face Hendra tests after horse's death". Brisbane Times. Australian Associated Press. Retrieved 29 June 2011.
- "Biosecurity Queensland adds Logan result to confirmed Hendra cases". Facebook. 21 July 2011. Retrieved 23 July 2011.
- Janelle Miles; Josh Robertson (26 July 2011). "Biosecurity Queensland investigates possible Hendra virus case near Chinchilla". The Courier-Mail. Retrieved 24 July 2011.
- "Confirmed case of hendra virus on NSW North Coast". 1 July 2014. Retrieved 3 July 2011.[dead link]
- Jo Joyce (11 October 2011). "Hendra horse owners speak out". ABC North Coast NSW. Retrieved 11 October 2011.
- "Biosecurity Bulletin" (Press release). NSW Government Department of Primary Industries. 13 July 2011. Retrieved 16 July 2011.
- "Second case of Hendra virus in NSW near Macksville". Retrieved 7 July 2011[dead link]
- "Second horse dies from Hendra in New South Wales on property near Macksville". Australian Associated Press. 7 July 2011. Retrieved 24 July 2011.
- "Update: Hendra virus infection confirmed at Park Ridge" (Press release). Queensland Department of Agriculture, Fisheries and Forestry. 5 July 2011. Retrieved 5 July 2011.
- Daniel Hurst (12 July 2011). "Hendra outbreak at LNP candidate's horse riding property". Brisbane Times. Australian Associated Press. Retrieved 12 July 2011.
- "Hendra virus case confirmed in Hervey Bay" (Press release). Queensland Department of Agriculture, Fisheries and Forestry. 16 July 2011. Retrieved 16 July 2011.
- "Fourth NSW horse dies from Hendra virus". Australian Associated Press. 17 July 2014. Retrieved 17 July 2011.
- "Hendra virus case confirmed in Boondall area" (Press release). Queensland Department of Agriculture, Fisheries and Forestry. 16 July 2014. Retrieved 16 July 2011.
- "Hendra virus case confirmed in Chinchilla area". Facebook. 23 July 2011. Retrieved 24 July 2011.
- "Fifth Hendra case confirmed at Mullumbimby" (Press release). NSW Department of Primary Industries. 28 July 2011. Retrieved 28 July 2011.
- "Biosecurity Bulletin" (Press release). NSW Department of Primary Industries. 18 August 2011. Retrieved 18 August 2011..
- "Biosecurity Bulletin" (Press release). NSW Department of Primary Industries. 17 August 2011. Retrieved 17 August 2011..
- Stephanie Small (23 August 2011). "Another Hendra outbreak in Queensland". Retrieved 23 August 2011.
- "Biosecurity Bulletin" (Press release). NSW Department of Primary Industries. 30 August 2011. Retrieved 30 August 2011.
- "New Hendra Virus Case in Caboolture Area". Facebook. 10 October 2011. Retrieved 11 October 2011.
- "Second Hendra Virus Case Confirmed at Beachmere Property". Facebok. 15 October 2011. Retrieved 15 October 2011.
- "New Hendra virus case in Townsville area". Facebook. 4 January 2012. Retrieved 5 January 2012.
- "Two new Hendra virus cases confirmed". Facebook. 29 May 2012. Retrieved 30 June 2012.
- "Quarantine lifted after Hendra outbreaks". Australian Broadcasting Corporation. 12 July 2012. Retrieved 19 July 2012.
- "Hendra virus quarantines lifted in Ingham and Rockhampton". Queensland Department of Agriculture, Fisheries and Forestry. Retrieved 23 September 2012.[dead link]
- Annie Guest (20 July 2014). "Hendra virus found in Rockhampton". PM (Australian Broadcasting Corporation). Retrieved 19 July 2012.
- "Horses put down after showing Hendra symptoms". Australian Broadcasting Corporation. 27 July 2014. Retrieved 27 July 2012.
- "Two horses euthanased on Rockhampton property". Facebook. 26 July 2012. Retrieved 27 July 2012.
- "New Hendra virus case in Mackay". Facebook. 27 June 2012. Retrieved 30 June 2012.
- "New Hendra virus case in Cairns area". Facebook. 27 July 2012. Retrieved 27 July 2012.
- "Testing underway after latest Hendra outbreak". Australian Broadcasting Corporation. 7 September 2012. Retrieved 7 September 2012.
- "New twist to Port Douglas Hendra death". Retrieved 14 September 2012.[dead link]
- "Horse dead after contracting Hendra virus". Australian Broadcasting Corporation. 3 November 2012. Retrieved 3 November 2012.
- "Horses to be tested after Hendra virus outbreak". Australian Broadcasting Corporation. 4 November 2012. Retrieved 4 November 2012.
- "Horse dies from Hendra virus near Mackay". Australian Broadcasting Corporation. 23 January 2013. Retrieved 23 January 2013.
- "New Hendra virus case confirmed in Qld". Australian Broadcasting Corporation. 22 February 2013. Retrieved 23 February 2013.
- Kim Honan (10 June 2013). "First NSW Hendra horse death in two years". Australian Broadcasting Corporation. Retrieved 10 June 2013.
- Sam Burgess (4 July 2013). "Second Brisbane Valley property faces Hendra virus lockdown". Australian Broadcasting Corporation. Retrieved 4 July 2013.
- Camilla Campbell (6 July 2013). "Hendra Outbreak Again in Macksville". NBN News. Retrieved 6 July 2013.
- "New Hendra case confirmed on NSW mid north coast" (Press release). NSW Department of Primary Industries. Retrieved 8 July 2013.
- "Dog infected with Hendra". The Land. NSW Department of Primary Industries. 20 July 2013. Retrieved 20 July 2013.
- "New Hendra virus case confirmed on Gold Coast". Facebook. 5 July 2013. Retrieved 6 July 2013.
- "Third Hendra case confirmed west of Kempsey" (Press release). NSW Department of Primary Industries. 8 July 2013. Retrieved 8 July 2013.
- "Hendra virus claims fourth horse death on NSW mid north coast" (Press release). NSW Department of Primary Industries. 10 July 2013. Retrieved 10 July 2013.
- "Fourth horse dies of Hendra virus at Kempsey on NSW mid north coast". Australian Broadcasting Corporation. 10 July 2013. Retrieved 10 July 2013.
- Jo Skinner (19 May 2014). "Tests reveal Hendra virus in horse on southern Qld property". Australian Broadcasting Corporation. Retrieved 19 May 2014.
- "Hendra virus outbreak south of Brisbane" - Australian Broadcasting Corporation - Retrieved 4 June 2014.
- Epidemiological methodology of communicating higher contagion periods for better common, non-scientific individual understanding
- Fogarty, R. D.; Halpin, K.; Hyatt, A. D.; Daszak, P.; Mungall, B. A. (2008). "Henipavirus susceptibility to environmental variables". Virus Research. 132 (1–2): 140–144. doi:10.1016/j.virusres.2007.11.010.
- Tony Moore (28 July 2011). "Nearly a third of bats now carry Hendra: researchers". The Sydney Morning Herald. Retrieved 29 July 2011..
- Janelle Miles; Andrew MacDonald; Koren Helbig (29 July 2011). "Fearon family plead with authorities for stay of execution for Hendra positive dog Dusty". The Courier-Mail. Retrieved 28 July 2011.
- Emma Sykes (4 July 2011). "Hendra virus research continues as more horses contract the disease". 612 ABC Brisbane. Retrieved 5 July 2011.
- "New hunt for Hendra in other species". The Sydney Morning Herald. Australian Associated Press. 27 July 2011. Retrieved 27 July 2011.
- Annie Guest (27 July 2011). "Urgent funds for hendra research". The World Today (Australian Broadcasting Corporation). Retrieved 27 July 2011.
- "Gillard Government helping in response to Hendra". Retrieved 11 August 2011.[dead link]
- "Opinion: combating the deadly Hendra virus". CSIRO. Retrieved 20 September 2012.[dead link]
- "Equine Henda Virus Vaccine Launched in Australia". The Horse. 1 November 2012. Retrieved 7 November 2012.
- John Taylor; Annie Guest (1 Nov 2012). "Breakthrough Hendra virus vaccine released for horses". Australian Broadcasting Corporation. Retrieved 1 November 2012.
- Pallister, J; Middleton, D; Wang, LF (2011). "A recombinant Hendra virus G glycoprotein-based subunit vaccine protects ferrets from lethal Hendra virus challenge". Vaccine 29 (24): 5623–30. doi:10.1016/j.vaccine.2011.06.015. PMC 3153950. PMID 21689706.
- Kelmeny Fraser (24 July 2011). "Hendra virus scientists push for vaccine to be fast-tracked". The Sunday Mail (Queensland). Retrieved 28 July 2011.
- "Hendra vaccine could be ready in 2012". Australian Associated Press. 17 May 2011. Retrieved 28 July 2011.
- Huw Morgan (20 September 2012). "A 'quantum' step towards on-the-spot Hendra virus detection". news@CSIRO. Retrieved 20 September 2012.
- Lisi F, Falcaro P, Buso B, Hill AJ, Barr JA, Crameri G, Nguyen T-L, Wang L-F, Mulvaney P; Falcaro; Buso; Hill; Barr; Crameri; Nguyen; Wang; Mulvaney (2012). "Rapid Detection of Hendra Virus Using Magnetic Particles and Quantum Dots". Advanced Healthcare Materials 1 (5): 631–634. doi:10.1002/adhm.201200072. PMID 23184798.
- Dr Jo Edmondston; Dr Hume Field (2009). "Research update: Hendra Virus". Australian Biosecurity CRC for Emerging Infectious Disease. Retrieved 17 July 2011.
- Middleton, D. "1Initial experimental characterisation of HeV (Redland Bay 2008) infection in horses". Retrieved 17 July 2011.
- Lee B, Ataman ZA; Ataman (2011). "Modes of paramyxovirus fusion: a Henipavirus perspective". Trends in Microbiology 19 (8): 389–399. doi:10.1016/j.tim.2011.03.005. PMC 3264399. PMID 21511478.
- Centers for Disease Control and Prevention (CDC) (30 April 1999). "Update: outbreak of Nipah virus—Malaysia and Singapore, 1999". Morbidity and Mortality Weekly Report (United States Centers for Disease Control and Prevention) 48 (16): 335–7. PMID 10366143.
- bt.cdc.gov[dead link]
- Siva SR, Chong HT, Tan CT (2009). "Ten year clinical and serological outcomes of Nipah virus infection". Neurology Asia 14: 53–58.
- "Dobbs and the viral encephalitis outbreak".. Archived thread from the Malaysian Doctors Only BBS.
- Chua KB, Chua BH, Wang CW; Chua; Wang (2002). "Anthropogenic deforestation, El Niño and the emergence of Nipah virus in Malaysia". The Malaysian Journal of Pathology 24 (1): 15–21. PMID 16329551.
- Chadha MS, Comer JA, Lowe L, Rota PA, Rollin PE, Bellini WJ, Ksiazek TG, Mishra A; Comer; Lowe; Rota; Rollin; Bellini; Ksiazek; Mishra (February 2006). "Nipah virus-associated encephalitis outbreak, Siliguri, India". Emerging Infectious Diseases 12 (2): 235–40. doi:10.3201/eid1202.051247. PMC 3373078. PMID 16494748.
- "Nipah Outbreak at Lalmonirhat". Bangladesh: Institute of Epidemiology, Disease Control and Research. 7 February 2011. Retrieved 21 May 2014.
- Chadha MS, Comer JA, Lowe L et al. (2006). "Nipah virus-associated encephalitis outbreak, Siliguri, India". Emerging Infectious Diseases 12 (2): 235–40. doi:10.3201/eid1202.051247. PMC 3373078. PMID 16494748.
- Hsu VP, Hossain MJ, Parashar UD et al. (2004). "Nipah virus encephalitis reemergence, Bangladesh". Emerging Infectious Diseases 10 (12): 2082–7. doi:10.3201/eid1012.040701. PMC 3323384. PMID 15663842.
- ICDDR,B (2005). "Nipah virus outbreak from date palm juice". Health and Science Bulletin 3 (4): 1–5.
- ICDDR,B (2007). "Person-to-person transmission of Nipah infection in Bangladesh". Health and Science Bulletin 5 (4): 1–6.
- ICDDR,B (2008). "Outbreaks of Nipah virus in Rajbari and Manikgonj". Health and Science Bulletin 6 (1): 12–3.
- ICDDR,B (2010). "Nipah outbreak in Faridpur District, Bangladesh, 2010". Health and Science Bulletin 8 (2): 6–11.
- "Arguments in Bahodderhat murder case begin". The Daily Star. 18 March 2008. Retrieved 21 May 2014.
- http://www.prothom-alo.com/detail/date/2011-02-04/news/128856[dead link]
- Reynes JM, Counor D, Ong S et al. (2005). "Nipah virus in Lyle's flying foxes, Cambodia". Emerging Infectious Diseases 11 (7): 1042–7. doi:10.3201/eid1107.041350. PMC 3371782. PMID 16022778.
- Wacharapluesadee S, Lumlertdacha B, Boongird K et al. (2005). "Bat Nipah virus, Thailand". Emerging Infectious Diseases 11 (12): 1949–51. doi:10.3201/eid1112.050613. PMC 3367639. PMID 16485487.
- Chua KB, Koh CL, Hooi PS et al. (2002). "Isolation of Nipah virus from Malaysian Island flying-foxes". Microbes and Infection 4 (2): 145–51. doi:10.1016/S1286-4579(01)01522-2. PMID 11880045.
- Lehlé C, Razafitrimo G, Razainirina J et al. (2007). "Henipavirus and Tioman virus antibodies in pteropodid bats, Madagascar". Emerging Infectious Diseases 13 (1): 159–61. doi:10.3201/eid1301.060791. PMC 2725826. PMID 17370536.
- Hayman D, Suu-Ire R, Breed A et al. (2008). "Evidence of henipavirus infection in West African fruit bats". In Montgomery, Joel Mark. PLoS ONE 3 (7): 2739. doi:10.1371/journal.pone.0002739. PMC 2453319. PMID 18648649.
- Bossart K. N., Rockx B., Feldmann F., Brining D., Scott D., LaCasse R., Geisbert J. B., Feng Y.-R., Chan Y.-P. et al. (2012). "A Hendra Virus G Glycoprotein Subunit Vaccine Protects African Green Monkeys from Nipah Virus Challenge". Science Translational Medicine 4 (146): 146ra107. doi:10.1126/scitranslmed.3004241.
- Mike Stobbe. "Uh-oh: Scientists say film 'Contagion' is for real". Yahoo News. Associated press. Retrieved 21 May 2014.
- Marsh, Glenn A.; de Jong, Carol; Barr, Jennifer A.; Tachedjian, Mary; Smith, Craig; Middleton, Deborah; Yu, Meng; Todd, Shawn; Adam J. Foord, Volker Haring, Jean Payne, Rachel Robinson, Ivano Broz, Gary Crameri, Hume E. Field, Lin-Fa Wang; Haring, Volker; Payne, Jean; Robinson, Rachel; Broz, Ivano; Crameri, Gary; Field, Hume E.; Wang, Lin-Fa (2 August 2012). "Cedar Virus: A Novel Henipavirus Isolated from Australian Bats". PLOS Pathogens 8 (8): e1002836. doi:10.1371/journal.ppat.1002836. PMID 22879820. Retrieved 4 August 2012.
- Biosecurity Queensland Hendra virus
- Hendra virus
- ViralZone: Henipavirus
- Hendra virus factsheet – CSIRO
- Nipah virus – CSIRO
- Henipavirus – Henipavirus Ecology Research Group (HERG) INFO
- The science and mystery of hendra virus – by Renee du Preez (ABC Rural) – Australian Broadcasting Corporation.
- Enserink M (February 2009). "Virus's Achilles' Heel Revealed". Science Now. AAAS.
- Virus Pathogen Database and Analysis Resource (ViPR): Paramyxoviridae