for thousands of year,rabies meant certain death any bite from a strange animal caused great fear then,in 1885,a famous French biologist,Louis Pasteur,developed a vaccine.the vaccine stopped the rabies virus.however,it only worked if the victim was given the vaccine at an early stage.In some cases,people did not get the vaccine soon enough.Then rabies symptoms appeared.The vaccine did not work at later stages,and the victim died.