College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China;
Department of Animal, Dairy, and Veterinary Sciences, Utah State University, Utah 84322-5600, USA;
Department of Animal, Dairy, and Veterinary Sciences, Utah State University, Utah 84322-5600, USA;
Cryptosporidium parvum; hydrogen peroxide; free radical scavengers; excystation; cell culture;