There is only limited information on the prevalence of T. gondii in monkeys in the wild. Garcia et al.571 found MAT (1:16) antibodiesin 30.2% of Cebus spp. (capuchin monkeys), and 17.6% of 17 Alouatta spp. (howler monkeys); these animals were caught wild in remote areas of the Paraná River basin, Paraná state, Brazil. Yabsley et al.1378 reported MAT (1:50) antibodies in 3 of 52 ringtailed lemurs (Lemur catta) but not in 4 black and white ruffed lemurs (Varecia variegata), and 6 blue-eyed black lemurs (Eulemur macaco flavifrons); these animals were caught in the wild on St. Catherines Island, Georgia. File and Kessler510 found T. gondii (1:16 titer, ELISA) in 10.2% of 243 Macaca mulatta from Cayo Santiago, Puerto Rico; these sera were from animals bled between 1956 and 1988. Ekanayake et al.457 found T. gondii antibodies in 12% of 170 toque macaques (Macaca sinica) from Sri Lanka. They did not nd any clinical signs or evidence of maternal transmission of T. gondii in these animals. T. gondii antibodies were found in 17.5% by MAT and 20% by IFA in sera of 40 captive M. mulatta in Brazil.1255