 Pasteur never gave proper credit to Toussaint and his discovery.Pasteur's nephew, bacteriologist Adrien Loir (1862-1941) was aware of Toussaint's work with the vaccine, of which he documented in the 1938 treatise, "A l'ombre de Pasteur" ("In the Shadow of Pasteur").From 1881, Toussaint was in declining health, reportedly from a nerve-related disease.