Porcine Respiratory and Reproductive Syndrome Virus Variants, Vietnam and China, 2007 by Qinghua Hu, Tiezhu Zhao, Tung Nguyen, Ken Inui, Ying Ma, Thi Hoa Nguyen, Van Cam Nguyen, Di Liu, Quang Anh Bui, Long Thanh To, Chuanbin Wang, Kegong Tian, George F. Gao

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