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Nine ponies, three horses and one mule aged six months to 13 years received orally 10 000 oocysts of strain GT-1 and were killed after 33-476 days. All remained clinically normal. Eleven animals were serologically negative before inoculation, but one pony had a titre of 1:40 in the modified agglutination test and another pony a titre of 1:40 in the dye test. Six (4 horses, a pony and the mule) had low antibody titres at death and T. gondii was not isolated from three of these (two horses and a pony). The remaining 7 ponies developed high titres, generally higher in the dye and modified agglutination tests than in latex agglutination. It is concluded that both the latex and the modified agglutination tests are useful for diagnosis in Equidae, a titre of 1:64 being specific, and that Equidae can develop high titres without clinical signs.