Grancher is remembered for his research of tuberculosis. He was a pioneer in the creation of safeguards for the prevention of childhood tuberculosis, and was an advocate of isolation and antisepsis in the fight against the disease. In 1897 with Jules Comby (1853–1947) and Antoine Marfan (1858–1942), he published "Traité des maladies de l’enfance" (Treatise of the Diseases of Childhood).
In 1885, Grancher and Alfred Vulpian (1826–1887) were instrumental in convincing Louis Pasteur (1822–1895) to perform the first successful vaccination against rabies on Joseph Meister, a 9-year-old boy who had been mauled by a rabid dog. In 1887 at the request of Pasteur, Grancher defended the rabies vaccination to the Académie de Médecine, citing its successful survival rate.[2]
^Gelfand, T (2002). "11 January 1887, the day medicine changed: Joseph Grancher's defense of Pasteur's treatment for rabies". Bulletin of the History of Medicine. 76 (4): 698–718. doi:10.1353/bhm.2002.0176. PMID12446976. S2CID33145788.