A medical term referring to infection by Hansen's bacillus, more commonly known as leprosy or Hansen's disease.
From Gerhard Armauer Hansen (1841-1912), the Norwegian physician who discovered the bacterium causing leprosy in 1873, combined with the medical suffix -osis meaning 'condition or disease.' The disease is formally called Hansen's disease in his honor.
Gerhard Hansen made one of medicine's greatest discoveries—he proved leprosy was caused by a microorganism, revolutionizing our understanding of infection at a time when people thought it was hereditary or a curse!
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