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It was carried out an investigation during 2016 with the aim to study epidemiological aspects of Cystoisospora suis infections. Sixty-seven (67) intensive swine herds with a history of neonatal diarrhea were included. Overall, 572 litters and 1,712 fecal samples in mature pigs were examined. A written epidemiological survey was applied on all farms. Fecal samples were cultured in 2.5% potassium dichromate and analyzed with a copro-parasitological technique. C. suis was found in 55/67 herds (82.1 %) and 210 litters (36.7 %) with highest prevalence in the first 2 wk of age ( P <0.05). Regarding mature pigs, a significant correlation was found (rho= 0.35; P <0.05) between infection in piglets and sows, suggesting that mothers sows could act as infection sources. Statistical associations were determined among parity number and frequency values in litters and sows ( P <0.05), indicating that as parity increase, prevalence decrease. Probably these findings are associated with unknown immunologic mechanisms. Infection in litters less than 3 d of age, presupposes the existence of some alternative infection route. It is concluded that C. suis is broadly distributed at the central region of Venezuela and it could be controlled by improving the sanitary conditions of the herds; however, immunologic mechanisms might be involved in the protozoa transmission cycle which remain yet to be determined.

Comportamiento epidemiológico de Cystoisospora suis en granjas porcinas ubicadas en la región central de Venezuela