Diversified Strains of Porcine Reproductive and Respiratory Syndrome Virus Circulating in China: A Mini-overview Journal title: Annual Research & Review in Biology Authors: Shao-Lun Zhai, Sheng-Nan Chen, Xiao-Hui Wen, Dian-Hong Lv, Zhong Huang, Man-Lin Luo, Wen-Kang Wei Subject(s):