World Leprosy
Sunday, January 25, 2026
In 1873, Cause of. Leprosy Discovered. Norwegian physician Gerhard Hansen discovered Mycobacterium leprae, the bacterium that causes leprosy, making it the first bacterium to be identified as causing disease in humans
History
Cause of Leprosy Discovered. Norwegian physician Gerhard Hansen discovered Mycobacterium leprae, the bacterium that causes leprosy, making it the first bacterium to be identified as causing disease in humans
How It's Celebrated
World Leprosy is observed by recognizing the importance of the day, learning about its background and significance, and sharing awareness with others through conversation and social media. Many people take time to reflect on the meaning of the observance and participate in relevant activities or community events.