G.H.A. Hansen, discoverer of M. leprae in 1873 The<unk>  was traced to its origins by an international team of 22 geneticists using comparative genomics of the worldwide distribution of Mycobacterium leprae. Monot et al. (2005) determined that<unk>  originated in East Africa or the Near East and traveled with humans along their migration routes, including those of trade in goods and slaves. The four strains of M. leprae are based in specific geographic regions where each predominantly occurs: : Strain 1 – East Africa, Asia, and the Pacific region : Strain 2 – Ethiopia, Malawi, Nepal/North India, and New Caledonia : Strain 3 – Europe, North Africa, and the Americas; and : Strain 4 – West Africa and the Caribbean. They created a map of the dissemination of<unk>  in the world. This confirmed the spread of the disease along the migration, colonisation, and slave trade routes taken from East Africa to India, West Africa to the New World, and from Africa into Europe and vice versa. In 1873 G.H. Armauer Hansen in Norway discovered the causative agent of<unk> , Mycobacterium leprae. This was the first bacterium to be identified as causing disease in humans. From the 19th century, European nations adopted some practices of India and China, administering naturally occurring oils. They were given by injection and orally, and were believed to cure some people, but results were often disputed. It was not until the 1940s that the first effective treatment, promin, became available. The search for additional anti-leprosy drugs led to the use of clofazimine and rifampicin in the 1960s and 1970s. Later, Indian scientist Shantaram Yawalkar and his colleagues formulated a combined therapy using rifampicin and dapsone, intended to mitigate bacterial resistance. Multi-drug therapy (MDT) combining all three drugs was first recommended by the World Health Organization (WHO) of the United Nations in 1981. These three anti-leprosy drugs are still used in the standard MDT regimens.
History of leprosy
History of smallpox
History of chemical warfare
History of polio
History of syphilis
History of HIV/AIDS
History of penicillin
History of plague