Jack jumper ant
|Jack jumper ant|
|Jack jumper worker|
F. Smith, 1858
|The jack jumper ant is endemic to most of Australia, including Tasmania.|
The jack jumper ant (Myrmecia pilosula), commonly known as the hopper ant, jumper ant or jumping jack, is a species of venomous ant native to Australia. Most commonly found in Tasmania and southeast Australia, it is a member of the Myrmecia giant bull ant genus and was first identified by Frederick Smith in 1858. The queen has a similar appearance to a worker, and males are easily noticeable due to their perceptibly smaller mandibles. They are large ants; workers and males are around the same size (12 to 14 millimetres (0.47 to 0.55 in) for workers and 11 to 12 millimetres (0.43 to 0.47 in) for males). The queen is larger, measuring 14 to 16 millimetres (0.55 to 0.63 in) in length.
Jack jumpers are primarily active during the day and live in nests surrounded by gravel and sandy soil, which can be found in woodlands and urban areas. Jack jumpers prey on small insects and sting them, killing the insect with injected venom. Other ants and predatory invertebrates prey on the jack jumper ant. The average jack jumper worker has a life expectancy of over one year. They possess the gamergates gene, which allows workers to reproduce with drones, either with or without the queen present in the colony. The jack jumper ant is a part of the Myrmecia pilosula species complex; this ant and other members of the complex are known to have a single pair of chromosomes.
The jack jumper's sting generally only causes a mild local reaction. However, along with other ants in the Myrmecia genus, it is one of the very few ant species that can be dangerous to humans. The ant venom is particularly immunogenic for an insect venom. The venom causes about 90% of Australian ant allergies. In endemic areas, up to 3% of the human population has developed an allergy to the venom and about half of these allergic people can suffer from anaphylactic reactions (increase of heart rate, falling blood pressure, and many other symptoms), which can lead to death on rare occasions. Between 1980 to 2000, there were four deaths due to anaphylaxis from jack jumper stings, all of which were in Tasmania. However, total deaths could be as high as six. Allergen immunotherapy (desensitisation) can be given to people who are prone to severe allergic reactions caused by jack jumper stings.
- 1 Taxonomy
- 2 Description
- 3 Distribution and habitat
- 4 Behaviour and ecology
- 5 Genetics
- 6 Interaction with humans
- 7 Historical treatment
- 8 See also
- 9 References
- 10 Further reading
- 11 External links
|External identifiers for Jack jumper ant|
|Encyclopedia of Life||484351|
The taxonomy of the genus Myrmecia has had several name changes, now considered as junior synonyms. These synonyms are Halmamyrmecia, Pristomyrmecia and Promyrmecia. In several publications by John Clark, the jack jumper goes under the name of Promyrmecia Pilosula, separated from the genus Myrmecia and apart of Promyrmecia instead, although these were considered a subgenus at the time. The jack jumper ant was first identified in 1858 by British entomologist Frederick Smith in his Catalogue of hymenopterous insects in the collection of the British Museum part VI, under the binomial name Myrmecia pilosula, from specimens he collected in Hobart in Tasmania. There, Smith described the specimens of a worker, queen and male jack jumper. The type specimen is located in the British Museum in London.
One synonym for the species has been published – Ponera ruginoda, also described by Smith in the same work, but was later found to be a junior synonym of the jack jumper ant, after specimens of each were compared. Among ants with occiptal carinae, the species was shown to be a monophyletic grouping, while other such Myrmecia ants were found to form a paraphyletic and basal assemblage. It has been shown that the jack jumper ant is not actually a single species, but instead show a range of chromosomes, which suggests that it is a sibling species, known as the Myrmecia pilosula species complex.
Their characteristic jumping motion when agitated or foraging inspires the common name "jack jumper", a behaviour also shared with other Myrmecia ants, such as the Myrmecia nigrocincta. This is the most common name for the ant, along with "jumper ant", "jumping jack" and "black jumper". It is also named after the jumping-jack firecracker. The jack jumper is a member of the genus Myrmecia, apart of the subfamily Myrmeciinae. Most ancestors to the jack jumper ant, and Myrmecia as a whole, are only found in fossils, with the exception of Nothomyrmecia macrops, the only known living relative.
The jack jumper ant, like its relatives, has a powerful sting and large mandibles. Jack jumper ants can be black or blackish-red in colour, and they may have yellow or orange legs. The jack jumper is medium-sized in comparison to other Myrmecia species, where workers are typically 12 to 14 millimetres (0.47 to 0.55 in) long. The ant's antennae, tibiae, tarsi and mandibles are also yellow or orange. Pubescence (hair) on the jack jumper is greyish, short and erect, and is longer and more abundant on their gaster, rather long on their mandibles, absent on their antennae, and very short and suberect on their legs. The pubescence on the male is grey and very long, and abundant throughout the ant's body, but it shortens on the legs.
The queen has a very similar appearance to the workers, but its sculpture (body) is more irregular and coarser. The queen is also the largest, measuring 14 to 16 millimetres (0.55 to 0.63 in) in length. Males are either smaller or around the same size as workers, measuring 11 to 12 millimetres (0.43 to 0.47 in). Males also have much smaller triangular mandibles than workers and queens. The mandibles on the male contain a large tooth at the centre, between the apex and the base of the inner border. Punctures (tiny dots) are noticeable on the head, where they are large and shallow, and the thorax and node are also irregularly punctuated. The pubescence on the male's gaster is white and yellowish.
Distribution and habitat
Jack jumper ants are abundant in most of Australia. They can be found as far from the center of population as Western Australia, where they have been seen in the sand hills around Albany, Mundaring, Denmark and Esperance. Jack jumpers are rarely sighted in the northern regions of Western Australia. In South Australia, they have been found at Mount Lofty, Normanville and Aldgate. There are dense populations on the western seaboard of Kangaroo Island. Jack jumpers are common in Victoria and New South Wales, especially in the Snowy Mountains, Blue Mountains and coastal regions of these states. The ants are also common in the Australian Capital Territory. In Queensland, they are present in the Bunya Mountains, Fletcher, Stanthorpe, Sunshine Coast, Tamborine Mountain and Millmerran, and have been found as far north as Rockhampton. The jack jumper ant also resides in Tasmania.
Jack jumper ants live in open habitats, such as pastures, gardens and lawns, preferring fine gravel and sandy soil. They can also be spotted around light bushland. Their preferred natural habitats include woodlands, open forests and rural areas, and are less common in urban areas. Populations of jack jumpers are usually very dense in higher mountain regions. Their nests are usually mounds built from finely granular gravel or soil, which are 20 to 60 centimetres (7.9 to 23.6 in) in diameter. Some nesting mounds can be as tall has half a metre in height. They can be found hidden under rocks, which is where queen jack jumper ants will most likely form their colony, or around small piles of gravel instead. The jack jumper's range in southern Australia, like other regional ant species, appears to be that of a relict ant. They often reside in damp areas, such as forests, that separate populations with broad stretches of arid land. Jack jumpers have been found in dry sclerophyll forests, at elevations ranging from 121 to 1,432 metres (397 to 4,698 ft), averaging around 1,001 metres (3,284 ft).
In Tasmania, jack jumper ants mostly live in rural areas, and can be found in warm, dry, open eucalypt woodlands; the climate provides the ant with isolation and warmth. This environment also produces the ant's food, which includes nectar and invertebrate prey. Jack jumpers are known to utilise the warmth of rocks and dry soil, and they decorate their nests with seeds, soil, charcoal, stones, sticks, and even small invertebrate corpses. In suburban areas, they are found in native vegetation, and use rockeries, cracks in concrete walls, dry dirt and grass to build nests. One study found that suburbs with voluminous vegetation cover, such as Mount Nelson, Fern Tree and West Hobart, have jack jumper populations, while places like North Hobart and Battery Point, suburbs which are heavily urbanised, do not.
Insecticidal control of the jack jumper ant is proven to be successful to maintain their populations around suburban habitats. Chemicals like bendiocarb, chlorpyrifos, diazinon and permethrin are effective against jack jumpers. Spraying of Solfac into nests is an effective way of controlling jack jumper nests if they are in a close range of areas with considerable amounts of congestion and human activity. The Australian National Botanic Gardens has an effective strategy of marking and maintaining jack jumper nests.
Behaviour and ecology
Jack jumpers are mainly diurnal, and will search for food during the day. They hibernate when temperatures are low. Jack jumper ants are highly territorial; fights among jack jumper ants are not uncommon, even between ones of the same colony. They are well known to be aggressive towards intruders, and have well developed vision, being able to observe and follow intruders from a metre away. Jack jumpers are easily attracted to movement. Wheeler (1922) compares jack jumper ants to "Lilliputian cavalry galloping to battle" when they are disturbed, due to their jumping behaviour." He wrote that they also made a ludicrous appearance as they emerge from their nests, in a series of short hops. The jack jumper ant has been observed on the inflorescences of Prasophyllum alpinum (mostly pollinated by wasps of the subfamily Ichneumonidae). Although pollinia is often seen in the ants' jaws, they have a habit of cleaning their mandibles on the leaves and stems of nectar-rich plants before moving on. This prevents pollen exchange, but indicates that the jack jumper does pollinate.
As with many species of bull ants, jack jumper ants are usually solitary when they forage, but only workers perform this role. Jack jumper ants are omnivores and scavengers, where they forage typically in warmer temperatures for food. They sting their victims with a painful venom, killing its victim quickly, that is similar to that of wasps, bees, and fire ants. Unlike the bee, the jack jumper ant is able to sting multiple times, rather than immediately dying. Jack jumper ants are skilled hunters, partly due to their excellent vision; they can even kill and devour wasps and bees. They also kill and eat other ants, such as carpenter ants (Camponotus) and feed on sweet floral secretions and other sugar solutions. Jack jumpers often hunt for spiders, and they will sometimes follow their prey for a short distance, usually with small insects and small arthropods. Jack jumper ants, alongside M. simillima, have been given frozen houseflies (Musca domestica) and blowflies (Calliphoridae) as food under testing conditions. The jack jumper has been observed to run and leap energetically at flies when they land, particularly on Acacia shrubs, plants or trees. These ants have been studied eating on dog carcasses (Canis Domesticus) in its early decomposition stage. Cockroaches and crickets are insects jack jumper ants and other Myrmecia ants will prey on.
Since mature adult jack jumpers mostly eat sweet substances, dead insects are given to their larvae they collected while foraging. They will mostly collect small insects, sap-sucking insects a long with the honeydew the sap-sucking insects collect to take back to their nest to feed their young as well. Throughout an experiment, observations were made of fly predation by European wasps and jack jumper ants. Jack jumpers would only attack the smaller fly species, as wasps would as well, but jack jumper ants would not attack larger fly species, unlike the European wasp.
Predators and parasites
The jack jumper and other Myrmecia species are preyed upon by other ants, as well as spiders, lizards, birds and mammals. Predatory invertebrates such as assassin bugs and redback spiders prey on jack jumpers and other Myrmecia ants, and echidnas, particularly the Short-beaked echidna (Tachyglossus Aculeatus), have been known to hunt them, eating their larvae and eggs. Nymphs of the assassin bug species Ptilocnemus lemur have been known to lure jack jumper ants. The jack jumper ant is a host to parasites such as the gregarines (Gregarinasina). Ants which host this parasite change colour from their typical black appearance to brown. This was discovered when brown jack jumpers were dissected, and were found to have gregarinasina spores, while black jack jumpers showed no spores. If it is present in large numbers, the parasite interferes with the normal darkening of the cuticle while the ant is in its pupal stage. The cuticle is known to soften due to the gregarine parasite.
Based on observations of six jack jumper worker ants, the average life expectancy of the jack jumper is around 1.3 years, but workers were shown to live as little as 1.12 years or as long as 1.6, with the queen living much longer than the workers. This data gives a life expectancy estimation of 401 – 584 days, with an average of 474 days. Egg clumping is common, as observed in laboratory colonies. These clumps were often carried by worker ants, and these clumps would contain two to 30 eggs, without any larvae to hold them together. This confirms that eggs from jack jumper colonies do not always lie singly apart. Newborns can also eclose (emerging from their pupa stage) without assistance from other ants. George C. Wheeler and Jeanette Wheeler (1971) studied and described larvae collected from New South Wales and South Australia. Very young larvae of the jack jumper as 2.4mm in length, with two types of body hair. They also described young larvae (matured from very young larvae) at 2.7mm in length, but with similar body characteristics to mature larvae, at 12.5mm in length.
Sometimes, like other Myrmecia species, a queen will raid a nest, kill the resident queen and take over the colony. Jack jumper workers, once born are able to identify distinct tasks, which is an obvious primitive trait Myrmecia ants are known for.
Queens will mate with between one and nine males during a nuptial flight, and the effective number of mates per queen was ranged at 1.0 to 11.4. Studies however show that the majority of queen ants will only mate with 1-2 males. It has been found that as the number of available male mates increases, the number of effective matings per queen decreases. Jack jumper colonies are polygyne, which means that they have multiple queens in one colony. When the queen establishes a nest after mating, she will hunt for food to feed her young, making her semi-claustral. Nests can hold as little as 500 ants, or as many as 1,000. Using the measuring method of alloenzymes, it was found that some colonies are polygynous and polyandrous. In a study of jack jumper colony genetic structure, there were between one and four queens per colony, and 11 of the 14 colonies tested were polygynous (78.57%), indicating that this is common in jack jumper colonies. The jack jumper ant possesses the gamergates gene, which gives workers the ability to reproduce in both queenless and queenright (colonies with a queen) colonies.
In multiple-queen colonies, the egg-laying queens are usually unrelated to one another. Because a majority of colonies are polygynous, a jack jumper colony can have around one to four queens on average. Though mentioned earlier, polygyny and polyandry societies can occur in some jack jumper nests, but it has also shown that some nests (in rare situations), a colony can be both polygynous and high polyandrous, rather than being either polygynous or polyandrous. Polyandry in jack jumper colonies is low in comparison to other Myrmecia ants, but it is comparable to M. pyriformis ants. In 1979, Craig and Crozier investigated the genetic structure of jack jumper ant colonies, and although queens are unrelated to one another as mentioned in a journal article, it was found that the occurrence of related queens in a single colony was indeed possible. During colony foundation, there are suggestions of dependent colony foundation in jack jumper queens, although independent colony foundations could occur, as the queens do indeed have fully developed wings and can fly. Isolation by distance (IBD) patterns have been recorded, specifically where nests that tend to be closer to one another were more genetically similar in comparison to other nests further away.
As colonies closer to one another are more genetically similar, independent colony foundation is most likely associated with nuptial flight if they disperse far from genetically similar colonies they originate from. Inseminated queens could even seek adoption into alien colonies if a suitable nest site area for independent colony foundation is restricted or cannot be carried out, known as the nest-site limitation hypothesis. Some queens could even try to return to their nests that they came from after nuptial flight, but end up in a different nest, in association to the fact that nests nearby will be similar to the queens birth nest.
The jack jumper ant genome is contained on a single pair of chromosomes (males have just one chromosome, as they are haploid). This is the lowest number known (indeed possible) for any animal. A study found that jack jumper ants have chromosome numbers that ranged from 2n to 32. Jack jumper ants are taxonomically discussed as a single biological species in the Myrmecia pilosula species complex, this information has also indicated that the chromosome numbers change in accordance with habitat elevation. In the jack jumper ant, chromosome rearrangement was used to explain the origin of a long metacentric chromosome through the fusion of the subtelocentric and an acrocentric chromosome. A study found that the jack jumper had 9 polymorphic loci, which yielded a total of 67 alleles, that ranged from 3 to 12 with an average of 7.44 per locus, and the observed heterozygosities ranged from 0.5625 to 0.9375, and from 0.4863 to 08711, respectively.
Interaction with humans
Dr. Paul Clark first drew medical attention to the jack jumper ant in 1986. Prior to this, there had been no history on fatalities or study on their sting venom. The Australasian Society of Clinical Immunology and Allergy registered reactions to the jack jumper between 1989 and 1994, where they recorded 454 sting episodes in 224 subjects. Identification of jack jumper venom allergens began in the early 1990s. Prior to Brown's immunotherapy program, there were several attempts to desensitise patients, who experienced allergic reactions, but the products used were ineffective and later withdrawn in the 1990s. Between 1980 and 2000, there have been four recorded deaths, all in Tasmania and all due to anaphylactic shock. Outside this time period, there has been one fatality in New South Wales and another separate incident in Tasmania, bringing the total fatalities to six. In 2001, the University of Technology, Sydney developed an immunotoxin, which targets malignant cells with a toxin that was found in the jack jumper ants venom, revealing that the venom can destroy cancer cells. In 2003, Professor Simon Brown established the jack jumper desensitisation program, although the program is at risk of closure. There has been no recorded deaths from the jack jumper ant since 2003 since the establishment of the program. Before establishment, the fatality rate was one person every four years from the sting. There has been numerous calls for the program to be rebated.
The extent of the jack jumper sting problem differs between areas. Allergy prevalence rates are significantly low in highly urbanised areas and much higher in rural areas. Jack jumper ants represent a hazard towards people in the southern states of Australia, due to a high proportion of the population having significant allergies to the ants sting. In urban areas, 17-30% of anaphylaxis cases are due to stings, but in rural areas, this is around 60%. The jack jumper ant is responsible for the majority of anaphylaxis cases in Australia, and rates of anaphylaxis are twice those of honeybee stings.
The jack jumper ant is notorious in Tasmania, where the most fatalities have been recorded. In 2005, over a quarter of all jack jumper sting incidents were sustained in Tasmania, which is rather excess in comparison to its 2006 population of only 476,000 people. The jack jumper ant has also been a major cause of anaphylaxis outside Tasmania, notably around Adelaide and the outskirts of Melbourne, while cases in New South Wales and Western Australia have been more distributed. One in 50 adults have been reported to suffer anaphylaxis due to the jack jumper or other Myrmecia ants. One in three million annually die of general anaphalaxis in Australia alone. Over 90% of Australian ant venom allergies have been caused by the jack jumper.
The jack jumper ant and its relatives in the genus Myrmecia are among the most dangerous ant genera and have fearsome reputations for their extreme aggression; Guinness World Records even listed Myrmecia pyriformis as the world's most dangerous ant. Jack jumpers have been compared to other highly aggressive ant species, such as Pachycondyla sennaarensis, Pachycondyla chinensis and the red imported fire ant (Solenopsis invicta). Their venom has been shown to contain haemolytic and eicosanoid elements, as well as histamines. It contains a range of active ingredients and enzymatic activity, which includes phospholipase A2 and B, hyaluronidase, acid and alkaline phosphatase. The venom of the ant also contains two peptides; one being pilosulin 1, which causes cytotoxic effects, and the other being pilosulin 2, which has antihypertensive properties. The peptides have known molecular weights. Pilosulin 1 inhibits the incorporation of methyl-3H thymidine into rapidly reproducing Epstein–Barr transformed (EBV) B-cells. The LD50 (lethal dose) occurs at a lower concentration than for melittin, a peptide found in bee venom. Foraging queens collected from Hobart contained a sting bulb gland, but an incomplete section series has not shown one in worker ants.
Loss of cell viability in the jack jumper's venom was researched through cytometry, which measures the proportions of cells that glow in the presence of fluorescent dye and 7-Aminoactinomycin D. Examinations of the rapidly reproducing Epstein–Barr B-cells showed that the cells lost viability within minutes when exposed to pilosulin 1. Normal white blood cells were also found to alter easily when exposed to pilosulin 1. However, partial peptides of pilosulin 1 were less efficient at lowering cell viability; it is suggested that the residue 22 N-terminal plays a critical role in the cytotoxic activity of pilosulin 1.
20 percent of jack jumper ants have an empty venom sac, so failure to display a sting reaction should not be interpreted as a loss of sensitivity. Substantial amounts of ant venom have been analysed in order to characterise venom components, and the jack jumper has been one of the main subjects in these studies. An East Carolina University study which summarised the knowledge about ant stings and their venom showed that only the fire ant and jack jumper had the allergenic components of their venom extensively investigated. These allergenic components include peptides that are found as heterodimers, homodimers and pilosulin 3. Only six Myrmecia ants, including the jack jumper are capable of inducing IgE antibodies.
Signs and symptoms
Reactions to jack jumper stings show similar symptoms to fire ant stings; namely local swelling, reddening and fever, followed by the formation of a blister. The sting from jack jumpers, bees and wasps are the most common causes of anaphylaxis from insect stings. People most commonly feel a sharp pain after these stings, similar to that from an electric shock. Some patients developed a systemic skin reaction after being stung by a jack jumper. The heart rate increases, and blood pressure falls rapidly. A severe allergic reaction can cause symptoms such as difficulty breathing and talking, swelling of the tongue and throat, coughing, chest tightness, abdominal pain, nausea and vomiting, loss of consciousness or collapse, and in children, symptoms like paleness and floppiness.
In individuals allergic to the venom (about 2–3% of the population), a sting sometimes causes anaphylactic shock. Although the median time from sting to cardiac arrest is 15 minutes, the maximum period is around three hours. The jack jumper ant allergy does not disappear quickly, as it has been shown in studies that people with jack jumper allergies will most likely suffer from another allergic reaction if re-stung. Approximately 70 percent of patients with a history of systemic reaction to the ant's sting had a further reaction when stung again. In comparison, systemic reaction figures for the Western honey bee (Apis mellifera) and European wasp (Vespula germanica) after being stung show a rate of 50% and 25%. About half of these reactions were life-threatening and occurred predominantly in people who have had previous incidents with the sting. Anaphylaxis in jack jumper ant stings is not rare; 2.9% of 600 residents from semi-rural Victoria had allergic reactions to the ant's sting, according to a questionnaire. The sensitivity to stings is persistent for many years.
In 2011, an Australian ant allergy venom study was conducted, with the goal of determining which native Australian ants were associated with ant sting anaphylaxis. It showed that the jack jumper ant was responsible for the majority of patients' reactions to Myrmecia ant stings. Of the 265 patients who reacted to a sting from an ant belonging to the Myrmecia genus, 176 were from the jack jumper. 15 from M. nigrocincta and three from M. ludlowi. 56 patients had reacted to other Myrmecia ants. The study concluded that four native species of Australian ants caused anaphylaxis. Apart from Myrmecia species, the green-head ant (Rhytidoponera metallica) was also responsible for several systemic reactions.
First aid and emergency treatment
If there is no signs of an allergic reaction, an ice park or commercially available spray are recommended to be used to relieve the pain. Stingose is also recommended to treat a jack jumper sting. Other treatments include washing the stung area with soap and water, and if there is continuous pain for several days, it is recommended to take antihistamine tablets for one to three days.
Treatment of a jack jumper ant sting is very similar to treatment for wasp and bee stings. Jack jumper stings are the single most common cause of anaphylaxis in patients at the Royal Hobart Hospitals. Fatalities are rare and all known patients who died as a result of jack jumper stings were at at least 40 years old and had cardiopulmonary comorbidities. One in five people need a second adrenaline injection when being treated for severe anaphylaxis. Two of the victims were taking angiotensin-converting enzyme inhibitors, which are known to increase the risk of anaphylaxis. Three had ant sting allergies, while the fourth victim carried adrenaline, which he did not use. Severe laryngeal oedema and coronary atherosclerosis was detected in most of the autopsies of those who died. This showed that most of the victims died within 20 minutes of being stung. Medications such as antihistamines, H2 blockers, corticosteroids and anti-leukotrienes have no effect on anaphylaxis.
Desensitisation and prevention
Desensitisation (also called allergy immunotherapy) to the jack jumper sting venom has shown to be effective in preventing anaphylaxis, but no analytical techniques to standardise jack jumper venom has been validated. Unlike for bee and wasp stings, there is lack of funding for jack jumper immunotherapy. Venom stability and shelf-life must be demonstrated in order for it to be distributed for clinical use; Jack jumper venom was found to be stable at temperatures at -18 °C and 4 °C for 12 months, as well as being able to be stored in 22% sucrose for 12 months, concluding the venom is stable enough for medical practice. Venom is available; however, it is not produced commercially due to the small demand.
The Royal Hobart Hospital offers a desensitisation program for patients who have had a severe allergic reaction to a jack jumper sting. However, the program may face closure due to budget cuts. Professor Simon Brown, who founded the program commented, "Closing the program will leave 300 patients hanging in the lurch". The program has been campaigned to be available in Victoria. Rapid dose increases have been found to be as safe as slower dose increases during immunotherapy.
There have been multiple clinical trials for placebo treatment and venom immunotherapy. Systemic reactions were much more likely in people who were under placebo treatment in comparison to venom immunotherapy. Also, patients who did react while on venom immunotherapy had less severe reactions. Follow-ups of untreated people older than 30 years old and with a history of severe allergic reactions (such as respiratory compromise and hypotension) indicated that they would benefit from the venom immunotherapy.
The efficacy (capacity to induce a therapeutic effect) of ant whole body extract immunotherapy remains unknown, but it was shown to reduce the risk of systemic reactions caused by the jack jumper's sting; the risk rate declined from 72% to 3%. Although venom extraction has been developed, its small market size would incur limited availability. Ultrarush initiation of insect immunotherapy is also known to increase the risk of systemic reactions, in comparison to semirush initiation (65% versus 29% for systemic reactions and 12% versus 0% for severe reactions). Although immunotherapy is successful, only 10 percent of patients do not have any response to desensitisation.
It has been suggested that people should avoid jack jumpers, but this is difficult to do. Closed footwear (boots and shoes) along with socks should be worn, rather than thongs or sandals, which put the person at risk. With this said, jack jumpers are still capable of stinging through fabric, and can find their way through gaps in clothing.
Most people recover uneventfully following a mild local reaction and up to about 3% of individuals suffer a severe localised reaction. Most individuals who suffer from severe localised reactions will most likely encounter another reaction if stung again. Fatalities are rare. Venom immunotherapy can prevent fatalities.
There are several bush remedies that are used to treat jack jumper stings (and any other Myrmecia sting). The young tips of a bracken fern is a useful bush remedy to treat jack jumper stings, discovered and currently used by Indigenous Australians. The tips are simply rubbed on the stung area. The remedy may relieve the local pain after getting stung immediately. Another plant that is used as a bush remedy is Carpobrotus glaucescens (known as angular sea-fig or pigface). The leaves on the plant contain juices that can be squeezed and rubbed on the stung area, which will relieve the pain from the sting. This is also useful for other insect bites.
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