Gerhard Armauer Hansen
Encyclopedia
Gerhard Henrik Armauer Hansen (29 July 1841 – 12 February 1912) was a Norwegian physician, remembered for his identification of the bacterium
Bacteria
Bacteria are a large domain of prokaryotic microorganisms. Typically a few micrometres in length, bacteria have a wide range of shapes, ranging from spheres to rods and spirals...

 Mycobacterium leprae
Mycobacterium leprae
Mycobacterium leprae, also known as Hansen’s coccus spirilly, mostly found in warm tropical countries, is a bacterium that causes leprosy . It is an intracellular, pleomorphic, acid-fast bacterium. M. leprae is an aerobic bacillus surrounded by the characteristic waxy coating unique to mycobacteria...

in 1873 as the causative agent of leprosy
Leprosy
Leprosy or Hansen's disease is a chronic disease caused by the bacteria Mycobacterium leprae and Mycobacterium lepromatosis. Named after physician Gerhard Armauer Hansen, leprosy is primarily a granulomatous disease of the peripheral nerves and mucosa of the upper respiratory tract; skin lesions...

.

Hansen was born in Bergen
Bergen
Bergen is the second largest city in Norway with a population of as of , . Bergen is the administrative centre of Hordaland county. Greater Bergen or Bergen Metropolitan Area as defined by Statistics Norway, has a population of as of , ....

 and studied medicine at the Royal Frederik's University (now the University of Oslo
University of Oslo
The University of Oslo , formerly The Royal Frederick University , is the oldest and largest university in Norway, situated in the Norwegian capital of Oslo. The university was founded in 1811 and was modelled after the recently established University of Berlin...

), gaining his degree in 1866. He served a brief internship at the National Hospital in Christiania (Oslo
Oslo
Oslo is a municipality, as well as the capital and most populous city in Norway. As a municipality , it was established on 1 January 1838. Founded around 1048 by King Harald III of Norway, the city was largely destroyed by fire in 1624. The city was moved under the reign of Denmark–Norway's King...

) and as a doctor in Lofoten
Lofoten
Lofoten is an archipelago and a traditional district in the county of Nordland, Norway. Though lying within the Arctic Circle, the archipelago experiences one of the world's largest elevated temperature anomalies relative to its high latitude.-Etymology:...

. In 1868 Hansen returned to Bergen to study leprosy while working with Daniel Cornelius Danielssen
Daniel Cornelius Danielssen
Daniel Cornelius Danielssen was a Norwegian physician, from Bergen. He worked with Gerhard Armauer Hansen, discovering the bacteria causing leprosy, and made Bergen a world centre of lepra research in the middle of the nineteenth century.Danielssen was a member of the Royal Swedish Academy of...

, a noted expert.

Leprosy was regarded as largely hereditary or otherwise miasmic
Miasma theory of disease
The miasma theory held that diseases such as cholera, chlamydia or the Black Death were caused by a miasma , a noxious form of "bad air"....

 in origin. Hansen concluded on the basis of epidemiological
Epidemiology
Epidemiology is the study of health-event, health-characteristic, or health-determinant patterns in a population. It is the cornerstone method of public health research, and helps inform policy decisions and evidence-based medicine by identifying risk factors for disease and targets for preventive...

 studies that leprosy was a specific disease
Disease
A disease is an abnormal condition affecting the body of an organism. It is often construed to be a medical condition associated with specific symptoms and signs. It may be caused by external factors, such as infectious disease, or it may be caused by internal dysfunctions, such as autoimmune...

 with a specific cause. In 1870-71 Hansen travelled to Bonn
Bonn
Bonn is the 19th largest city in Germany. Located in the Cologne/Bonn Region, about 25 kilometres south of Cologne on the river Rhine in the State of North Rhine-Westphalia, it was the capital of West Germany from 1949 to 1990 and the official seat of government of united Germany from 1990 to 1999....

 and Vienna
Vienna
Vienna is the capital and largest city of the Republic of Austria and one of the nine states of Austria. Vienna is Austria's primary city, with a population of about 1.723 million , and is by far the largest city in Austria, as well as its cultural, economic, and political centre...

 to gain the training necessary for him to prove his hypothesis
Hypothesis
A hypothesis is a proposed explanation for a phenomenon. The term derives from the Greek, ὑποτιθέναι – hypotithenai meaning "to put under" or "to suppose". For a hypothesis to be put forward as a scientific hypothesis, the scientific method requires that one can test it...

. 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.

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 conflict between Neisser and Hansen, Hansen as discoverer of the bacillus and Neisser as identifier of it as the etiological
Etiology
Etiology is the study of causation, or origination. The word is derived from the Greek , aitiologia, "giving a reason for" ....

 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
Microbiological culture
A microbiological culture, or microbial culture, is a method of multiplying microbial organisms by letting them reproduce in predetermined culture media under controlled laboratory conditions. Microbial cultures are used to determine the type of organism, its abundance in the sample being tested,...

 in an artificial medium or to prove that the rod-shaped
Bacillus (shape)
The word bacillus may be used to describe any rod-shaped bacterium, and such bacilli are found in many different taxonomic groups of bacteria. However, the name Bacillus, capitalized and italicized, refers to a specific genus of bacteria...

 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
Hospital
A hospital is a health care institution providing patient treatment by specialized staff and equipment. Hospitals often, but not always, provide for inpatient care or longer-term patient stays....

.

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.

Hansen had suffered from syphilis
Syphilis
Syphilis is a sexually transmitted infection caused by the spirochete bacterium Treponema pallidum subspecies pallidum. The primary route of transmission is through sexual contact; however, it may also be transmitted from mother to fetus during pregnancy or at birth, resulting in congenital syphilis...

 since the 1860s but died of heart disease
Cardiovascular disease
Heart disease or cardiovascular disease are the class of diseases that involve the heart or blood vessels . While the term technically refers to any disease that affects the cardiovascular system , it is usually used to refer to those related to atherosclerosis...

.

In Bergen, a medical museum
Museum
A museum is an institution that cares for a collection of artifacts and other objects of scientific, artistic, cultural, or historical importance and makes them available for public viewing through exhibits that may be permanent or temporary. Most large museums are located in major cities...

 has been designated Hansen, which is often referred to as the Leprosy Museum. The University of Bergen
University of Bergen
The University of Bergen is located in Bergen, Norway. Although founded as late as 1946, academic activity had taken place at Bergen Museum as far back as 1825. The university today serves more than 14,500 students...

 has also dedicated a research facility to him - Armauer Hansen Building - located at Haukeland University Hospital
Haukeland University Hospital
Haukeland University Hospital is a hospital in Bergen, Norway, and one of the 11 institutions that form the Bergen Hospital Trust. The hospital is the largest in Norway in terms of number of patients, and serves as the local hospital of Bergen, Midthordland and Nordhordland, the central hospital of...

 in Bergen. The Leprosy Archives in Bergen has been nominated by UNESCO
UNESCO
The United Nations Educational, Scientific and Cultural Organization is a specialized agency of the United Nations...

 to the list:Memory of the World.
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