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Preliminary data on the efficacy of a Giardia vaccine in puppies.

Twenty puppies were vaccinated with a trophozoite-derived Giardia vaccine on day 0 and boosted on day 21 (Group 1); 10 control puppies received only saline (Group 2). Both groups were experimentally infected on day 35 with 1 x 10(6) Giardia duodenalis trophozoites by intraduodenal injection. Immunization provided protection to experimental Giardia infection.