"Ridiculed over his theory that germs cause disease, Louis Pasteur continues his work and eventually finds a cure for anthrax. Despite the warnings of his fierces critic, Dr. Charbonnet, Pasteur risks imprisonment when he proceeds with the radical idea that injecting humans with the rabies virus will lead to immunization. His beliefs are soon put to the test when Charbonnet agrees to attend Pasteur's pregnant daughter but will only sterilize his instruments...