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Vostalová E., I. Literák, I. Pavlásek, K. Sedlák: Prevalence of Toxoplasma gondii in Finishing Pigs in a Large-scale Farm in the Czech. Acta Vet. Brno 1999, 69: 209-212. In January, April and November 1999, slaughter pigs from a large-scale farm in South Bohemia, Czech Republic, were tested for Toxoplasma gondii antibodies and assayed for T. gondii. The complement fixation test (CFT) revealed antibodies in 4 of 787 pigs (0.5%). The Sabin-Feldman test (SFT) of 259 slaughter pigs revealed antibodies in 1 pig (0.4%). In the two tests, titres 8 and 4 respectively were considered positive. An isolation biological assay on laboratory mice was used to test tissue specimens from the brain and diaphragm muscles of 97 randomly selected pigs from the April and November tests. The results of the isolation tests were negative. The results showed that between 1981-1990 and 1999, no significant toxoplasmosis seroprevalence changes occurred on this modern large-scale pig farm characterized by a high standard of zoohygiene and veterinary supervision. Pigs, Toxoplasma gondii, antibodies, isolation Swine toxoplasmosis is a world-wide infection caused by an intracellular parasite, Toxoplasma gondii. In pigs, a latent form of the disease usually develops, but clinical cases of the infection have also been reported (Dubey and B eattie 1988). The real problem of toxoplasmosis in pigs lies in the fact that tissues of infected animals may contain T. gondii tissue cysts and these, if ingested in insufficiently cooked pork and if personal hygiene principles were poor when cooking it, may cause latent or even clinical infections in man (Jíra and R osick˘ 1983). Pig toxoplasmosis has been given particular attention in countries where pork plays an important role in the human diet. In the Czech Republic, several studies of pig toxoplasmosis have been made in recent decades. The results of serological tests for pig toxoplasmosis from the 1948-1970 period were summarized by Kouba et al. (1974). In that period, seroprevalence among pigs was 37.5 %, 41.9 % and 10.7 % as ascertained by Sabin-Feldman test (SFT), complement fixation test (CFT) and microprecipitation on agar gel (MPA), respectively. Another study of slaughter pigs was made between 1979 and 1989. In that period, the average seroprevalence in pigs was 8.8% (Hejlíãek and Literák 1993). The most extensive study was made from 1979 to 1990. It looked into the prevalence of toxoplasmosis among slaughter pigs in the South Bohemian district of Strakonice (He jlíãek and Literák 1993). Antibodies against T. gondii were found in 5.9%, 0.3% and 0.1% of the animals by SFT, CFT and MPA respectively. The pigs examined came from standard pig farms that offered a possibility for comparison. The results of this study showed a marked decrease in the prevalence of toxoplasmosis among pigs in the 1979-1990 period in comparison with the 1948 - 1970 period. The highest prevalence was found among pigs from small backyard operations, while the prevalence among pigs from traditional large farms - and even more so from modern large-scale farms - were lower.

Prevalence of Toxoplasma gondii in Finishing Pigs in a Large-scale Farm in the Czech Republic