Figure 3

Minimal spanning tree of 74 Inaba strains of O1 El Tor V. cholerae isolated in China based on the rfbT sequence. Subtypes are indicated by circles, whose diameter increases as the number of strains increases. Colors were used to indicate the different time periods when the strains were isolated. The strain names in different subtypes are shown in the corresponding circles except the one labeled A. Strains in circle A were characterized with 11-bp deletion and isolated during the first Inaba dominated epidemic period (1979–1988). Circle A includes strain BJ821, JX801361, BJ83801, FJ85063, HN8232, JS80269, JX801360, SD83101, AH88602, FJ86104, HN81331, JX801309, JX801363, BJ83795, JS80215, JX801305, JX84172, JX8788, SD83163, SD83164, SD83167, SX8429, JX801342, HN84345, FJ80004, GD791080, GD791084, GD861812, HN81175, JX801295, JX8659, JX87123, SC83535, ZJ861071, FJ8004, JX84190, LN85092, SD83176, JX801290, JS80252, FJ85010 and ZJ82428.