INFECTIVITY OF CRYPTOSPORIDIUM-MURIS DIRECTLY ISOLATED FROM THE MURINE STOMACH FOR VARIOUS LABORATORY-ANIMALS

Oocysts of Cryptosporidium muris, directly isolated from the stomach o f experimentally infected laboratory mice were orally inoculated into rats, gerbils, guinea pigs, dogs, and rabbits. Weaned rats developed p atent C. muris infection as evidenced by the endogenous stages in gast ric glands and oocyst shedding 10-17 days later, No signs of clinical illness or macroscopic findings were detected in mice and rats. Labora tory raised suckling rabbits, guinea pigs, gerbils and dogs fed C. mur is rarely developed patent infections and they were considered not a t rue host for C. muris.