Thirty six CMU BJ strains (), 20 other BJ strains (), 52 representative CHN strains and 25 international reference strains (including 14 EV71 C4 strains marked with , BrCr marked with and 10 representative strains of different subgenotypes) are included in this dendrogram. The 52 representative CHN strains were selected from more than 19 provinces and 20 cities in mainland China from 1987 to 2011 according to available locality, time distribution and grouping type. Details of all the EV71 strains included in the dendrogram are provided in Table S1. Country abbreviations: NL, Netherlands; AUS, Australia; KOR, Korea; AUT, Austria; GER, Germany; FRA, France; JPN, Japan; VNM, Vietnam; THA, Thailand; MAL, Malaysia; USA, United States of America; CHN, People's Republic of China. Region abbreviation: TW, Taiwan. Abbreviation of Chinese cities: BJ, Beijing; SH, Shanghai; CQ, Chongqing. Abbreviation of Chinese provinces: HLJ, Heilongjiang; SD, Shandong; GD, Guangdong; GX, Guang Xi; ZJ, Zhejiang; YN, Yunnan; AH, Anhui; HuB, Hubei; JS, Jiangsu; GS, Gansu; HeN, Henan; HeB, Hebei; SC, Si Chuan; SX, Shanxi (taiyuan); SHX, Shanxi (xi'an); NM, Neimeng; NX, Ning Xia; JL, Ji Lin; HuN, Hu Nan.