Guangdong Laboratory of Lingnan Modern Agriculture Guangdong Provincial Key Laboratory of Animal Nutrition Control National Engineering Research Center for Breeding Swine Industry College of Animal Science South China Agricultural University Guangzhou 510642 ChinaDepartment of Pathology Microbiology and Immunology Vanderbilt University School of Medicine Nashville TN 37232 USA;
Guangdong Laboratory of Lingnan Modern Agriculture Guangdong Provincial Key Laboratory of Animal Nutrition Control National Engineering Research Center for Breeding Swine Industry College of Animal Science South China Agricultural University Guangzhou 510642 China;
Guangdong Laboratory of Lingnan Modern Agriculture Guangdong Provincial Key Laboratory of Animal Nutrition Control National Engineering Research Center for Breeding Swine Industry College of Animal Science South China Agricultural University Guangzhou 510642 China;