The increase of CD4⁺CD25⁺ T cells in the peripheral blood of pigs persistently infected with porcine reproductive and respiratory syndrome virus

Jingwen ZENG, Danting HE, Xin GUO, Xinna GE and Hanchun YANG

Turkish Journal of Veterinary and Animal Sciences 35 ( 3 ): 177 - 182 , 2011