Léon Charles Albert Calmette (July 12, 1863 – October 29, 1933) was a French physician, bacteriologist and immunologist, and
an important officer of the Pasteur Institute. He discovered the Bacillus Calmette-Guérin, an attenuated form of Mycobacterium
used in the BCG vaccine against tuberculosis. He also developed the first antivenin for snake venom, the Calmette's serum.
Calmette was born in Nice, France.
