Gerhard Armauer Hansen
|Gerhard Henrik Armauer Hansen|
Gerhard Armauer Hansen
29 July 1841|
|Died||12 February 1912
|Alma mater||University of Oslo|
|Notable awards||Royal Norwegian Order of St. Olav|
Gerhard Henrik Armauer Hansen (29 July 1841 – 12 February 1912) was a Norwegian physician, remembered for his identification of the bacterium Mycobacterium leprae in 1873 as the causative agent of leprosy.
Hansen was born in Bergen, Norway and attended the Bergen Cathedral School. He at Rikshospitalet in Christiania ( now Oslo) and as a doctor in Lofoten. In 1868 Hansen returned to Bergen to study leprosy while working at Lungegård Hospital (Lungegårdshospitalet) with Daniel Cornelius Danielssen, a noted expert.
Leprosy was regarded as largely hereditary or otherwise miasmic in origin. Hansen concluded on the basis of epidemiological studies that leprosy was a specific disease with a specific cause. In 1870–71 Hansen travelled to Bonn and Vienna to gain the training necessary for him to prove his hypothesis. In 1873, he announced the discovery of Mycobacterium leprae in the tissues of all sufferers, although he did not identify them as bacteria, and received little support. The discovery was done with a "new and better" microscope.
In 1879 he gave tissue samples to Albert Neisser who successfully stained the bacteria and announced his findings in 1880, claiming to have discovered the disease causing organism. There was some quarreling between Neisser and Hansen, Hansen as discoverer of the bacillus and Neisser as identifier of it as the etiological agent. Neisser put in some effort to downplay the assistance of Hansen. Hansen's claim was injured by his failure to produce a pure microbiological culture in an artificial medium or to prove that the rod-shaped organisms were infectious. Further Hansen had attempted to infect at least one female patient without consent and although no damage was caused, that case ended in court and Hansen lost his post at the hospital.
Hansen remained medical officer for leprosy in Norway and it was through his efforts that the leprosy acts of 1877 and 1885 were passed, leading to a steady decline of the disease in Norway from 1,800 known cases in 1875 to just 575 cases in 1901. His distinguished work was recognized at the International Leprosy Congress held at Bergen in 1909. 
- Leprosy Museum (Lepramuseet) at St. Jørgen Hospital in Bergen has been dedicated to Hansen. 
- Haukeland University Hospital has established Armauer Hansens hus as a research facility operated by the University of Bergen. 
- n Jerusalem, a 19th-century leprosarium has borne Hansen's name since 1950. It has been reconstructed into an art center while preserving the physician's surname in its title.
|Wikimedia Commons has media related to Gerhard Armauer Hansen.|
- Hansen GHA (1874). "Undersøgelser Angående Spedalskhedens Årsager (Investigations concerning the etiology of leprosy)". Norsk Mag. Laegervidenskaben (in Norwegian). 4: 1–88.
- Irgens L (2002). "The discovery of the leprosy bacillus". Tidsskr nor Laegeforen. 122 (7): 708–9. PMID 11998735.
- Venita Jay. "The Legacy of Armauer Hansen". Arch Pathol Lab Med—Vol 124, April 2000. Retrieved January 1, 2017.
- Irgens L; Rabson, S. M. (1984). "The discovery of Mycobacterium leprae. A medical achievement in the light of evolving scientific methods". Am J Dermatopathol. 6 (4): 337–43. doi:10.1097/00000372-198408000-00008. PMID 6388392.
- "Gerhard Henrik Armauer Hansen". whonamedit.com. Retrieved 22 March 2007.
- Bergenseren som løste lepra-gåten Aaftenposten . 16 September 2012
- Ole Didrik Lærum. "Gerhard Armauer Hansen, Lege". Norsk biografisk leksikon. Retrieved January 1, 2017.
- Svein Atle Skålevåg. "Gerhard Armauer Hansen". Store norske leksikon. Retrieved January 1, 2017.
- Biography of Gerhard Henrik Armauer Hansen whonamedit.com
- Gerhard Armauer Hansen (1814-1912) Journal of the Association of Physicians of India, vol 63, March, 2015
- "St. Jørgen hospital (Lepramuseet)". Medisinsk historie i Bergen. 6 May 2015. Retrieved January 1, 2017.
- "Armauer Hansens hus". Haukeland universitetssjukehus. 6 May 2015. Retrieved January 1, 2017.
- The Hansen Compound: From Leper Hospital to Multimedia Art Center. israelightly.wordpress.com. 31 May 2013