Methods for inactivation of Toxoplasma gondii cysts in meat and tissues of experimentally infected sheep.
This study utilized infectivity bioassays in cats and mice to assess the efficacy of inactivation of Toxoplasma gondii cysts in experimentally infected sheep meat and tissues subjected to chilling, freezing, heating, microwave cooking, and gamma ray irradiation. Heating at 60 degrees C or 100 degrees C for 10 minutes, freezing at either -10 degrees C for 3 days or -20 degrees C for 2 days, or irradiation at doses of 75 or 100 krad was sufficient to kill tissue cysts. Meanwhile, neither cooking in a microwave nor chilling at 5 degrees C for 5 days was sufficient to kill tissue cysts.
El-Nawawi
Fathi A
FA
Department of Food Hygiene, Faculty of Veterinary Medicine, Cairo University, Cairo, Egypt.
Tawfik
Mohamed A
MA
Shaapan
Raafat M
RM
D000818:Animals; D002371:Cat Diseases / Q000469:parasitology; D002415:Cats; D003080:Cold Temperature; D005260:Female; D005514:Food Irradiation; D016266:Food Parasitology; D005720:Gamma Rays; D006358:Hot Temperature; D008460:Meat / Q000469:parasitology* / Q000528:radiation effects; D051379:Mice; D008872:Microwaves; D012756:Sheep; D012757:Sheep Diseases / Q000469:parasitology; D013997:Time Factors; D014122:Toxoplasma / Q000472:pathogenicity / Q000528:radiation effects*; D014124:Toxoplasmosis, Animal / Q000469:parasitology