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Volume 16, Number 2—February 2010

Letter

Origin of Highly Pathogenic Porcine Reproductive and Respiratory Syndrome Virus, China

Tong-Qing An, Zhi-Jun Tian, Yan Xiao, Ran Li, Jin-Mei Peng, Tian-Chao Wei, Yi Zhang, Yan-Jun Zhou, and Guang-Zhi TongComments to Author 
Author affiliations: Harbin Veterinary Research Institute, Harbin, People's Republic of China (T.-Q. An, Z.-J. Tian, Y. Xiao, R. Li, J.-M. Peng, T.-C. Wei, Y. Zhang, G.-Z. Tong); Shanghai Veterinary Research Institute, Shanghai, People's Republic of China (Y.-J. Zhou, G.-Z. Tong)

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Appendix Figure

Phylogenetic relationships of 67 porcine reproductive and respiratory syndrome viruses (PRRSVs) based on their whole-genome sequences. The unrooted phylogenetic tree was generated by the neighbor-joining method using Molecular Evolutionary Genetics Analysis 4 (5). Bootstrap values were calculated on 1,000 replicates. The 53 isolates from China were classified into 4 subgroups (circled). Four commercially available attenuated live vaccine viruses are marked with asterisks. MLV, modified live vacc

Appendix Figure. Phylogenetic relationships of 67 porcine reproductive and respiratory syndrome viruses (PRRSVs) based on their whole-genome sequences. The unrooted phylogenetic tree was generated by the neighbor-joining method using Molecular Evolutionary Genetics Analysis 4 (5). Bootstrap values were calculated on 1,000 replicates. The 53 isolates from China were classified into 4 subgroups (circled). Four commercially available attenuated live vaccine viruses are marked with asterisks. MLV, modified live vaccine; NVSL, National Veterinary Services Laboratories; CH, China; SP, Singapore; HN, Henan; BJ, Beijing; HB, Hebei; WUH, Wuhan; JX, Jiangxi; GD, Guangdong; LN, Liaoning; NM, Neimenggu; JS, Jiangsu; SH, Shanghai; TJ, Tianjin; SX, Shanxi; HUB, Hubei; YN, Yunnan; NX, Ningxia, GS, Gansu.

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