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Locations of specimen collection in this study. AH, GX, GZ, HuN, JS, SD, SH, ZJ, indicate Anhui, Guangxi, Guizhou, Hunan, Jiangsu, Shandong, Shanghai, Zhejiang provinces of China, where the specimen were collected in this study during 2003 to 2008. I and II indicate the presence of isolates corresponding to Clade I and II as classified by the phylogenetic tree.
