Detecção de anticorpos IgG anti Toxoplasma gondii em ovinos utilizados em sistema de produção semi-intensivo

Abstract

Toxoplasma gondii is a Apicomplexa protozoan that family Sarcocystidae. Presentes a definitive hosts the Felidae family members, and birds mammals as intermediate hosts. T.gondii is an important pathogen of sheep, being observed abortious in tissues since 1942. The of this study was IgG antibobies frequency against T. gondii in sheep kep in a reproduction program. We used sera from 113 Santa Inês bred sheeps (79 multiparous and 34 nuliparous), two dogs and a cat, in a property with semi-intensive production system in the city of Entre Rios – Bahia. Sera were tested using the indirect hemagglutination test (IHA) to detection of IgG antibodies of T.gondii. Serum samples were screened at a dilution of 1:64 and. Those with positive reaction, were diluted in serially (ratio of two), until there is no more reaction. Six samples (5.30%) were positive by indirect hemagglutination test. Two samples were positive at 1:64, two samples at of 1:128 and more two in of 1:256. All sheep were positive multiparous. Only one dog was positive at titers of 1:128. The cat tested show no reaction in the test. The results lead us to conclude that 5.30% of the sheep have antibodies IgG anti T.gondii in the study conditions. This indicat that the parasite may be present on farms that use semi intensive production system and reproduction programs.