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Comparative Study
Journal Article
Long-term persistence of Toxoplasma gondii in tissues of pigs inoculated with T gondii oocysts and effect of freezing on viability of tissue cysts in pork.
American Journal of Veterinary Research 1988 June
To study the distribution of tissue cysts in porcine tissues, 16 pigs were fed oocysts of 4 strains of Toxoplasma gondii (4 pigs/strain). Pigs were euthanatized between postinoculation days 103 and 875 and portions of 5 to 14 organs were bioassayed in mice and/or cats for T gondii. For bioassays, 50- to 100-g portions of tissue were incubated in acidic pepsin solution to free bradyzoites from cysts in parenchyma, and washed sediment from the digests of each specimen was inoculated SC into mice (6 mice/organ). For bioassays in cats, a 500-g portion or whole organ was fed to Toxoplasma-free cats (1 cat/organ). Toxoplasma gondii was recovered from tissues of 14 of the 16 pigs (from the brains of 12, hearts of 11, tongues of 10, and diaphragms of 6). Toxoplasma gondii was isolated from commercial cuts of meat from 5 infected pigs; from the arm picnic and ham of 3, Boston butt, spareribs, and tenderloin of 2, and bacon and tailbone of 1. Regarding the 4 pigs euthanatized between postinoculation days 759 and 865, cats shed T gondii oocysts after the ingestion of hearts of all 4; tongues of 3; bacons, hams, arm picnics, Boston butts, spareribs, and diaphragms of 2; and livers, kidneys, and tenderloins of 1. Toxoplasma gondii was found to be inconsistently distributed among the organs and muscles, but overall, tongue and heart were more heavily infected than were other tissues. Tissue cysts in pork were rendered nonviable at -12 C for 3 days.
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