as Louis Pasteur
as Robert Koch
as Emile Roux
as Marie Pasteur
as Emmy Koch
as Gertrud Koch
as Mme Meister
as Joseph Meister
as M. Gaffky
as Hedwige
as M. Rossignol
as M. Kaufer
as M. Maunoury
as Dr. Grancher
as M. Fischer
as Louis Thuillier
as French scientist
as Veterinary
as Veterinary's wife
as Journalist
as German scientist
as Pasteur's assistant
as Koch's assistant
as Narration