When did Joseph Messner die?

Joseph Meister was the first person to be treated from rabies. He was treated by Louis Pasteur.

Joseph Meister was a 9-year-old boy who had been attacked by a rabid dog (which he had provoked by poking it with a stick), an automatic death sentence at the time (1885). Louis Pasteur administered an early, experimental version of his rabies vaccine to Meister, who survived - the first person in history so treated. Good thing it worked: Pasteur was not a licensed physician, and could have been prosecuted, but since he saved the boy from an inevitable, agonizing death, legalities were overlooked and he became a national hero.

Meister went on to become somewhat of a hero himself, as the caretaker at the Pasteur Institute: In 1940, he committed suicide at age 64 by shooting himself with his WWI service revolver, rather than allow the Wehrmacht to enter the Pasteurs' crypt.