 Paul-Louis Simond

Paul-Louis Simond (30 July 1858 – 3 March 1947) was a French physician, chief medical officer and biologist whose major contribution to science was his demonstration that the intermediates in the transmission of bubonic plague from rats to humans are the fleas "Xenopsylla cheopis" that dwell on infected rats.Paul-Louis Simond was born in Beaufort-sur-Gervanne, (Drome, France) on 30 July 1858.