Worldwide serologic prevalences in free-range or backyard chickens using the MAT performed in my laboratory are given in Table 12.1. Prevalence varied from 2 to 100% depending on the source of the chickens. Additionally, Deyab and Hassanein et al. 255a found MAT antibodies in 18.7% of 150 chickens from slaughterhouses in Egypt, and Yan et al.1379b reported MAT T. gondii antobodies in 11.4% of 361 FR chickens and in 4.1% of caged chickens in People’s Republic of China.