Figure 1

Ribotype distributions for studies in China (A,B), Hong Kong (C), Japan (D-G) and Korea (H-K). A: n = 75 isolates collected in 2008; 33 ribotypes identified [37]. B: n = 110, December 2008-May 2009; 16 ribotypes [39]. C: n = 345, 2009; 106 ribotypes [40]. D: n = 87, March 1996-November 1999; 12 ribotypes [8]. E: n = 148, November 1999-October 2004; 26 ribotypes [16]. F: n = 71, April 2005-March 2008; 20 ribotypes [14]. G: n = 87, 2003–2007; 18 ribotypes [17]. H: n = 187, 1980–2006; 39 ribotypes [27]. I: n = 105, 1995–2008; 11 ribotypes [32]. J: n = 337 toxigenic isolates, 2006–2008; 50 ribotypes [31]. K: n = 194, 2009–2010; 54 ribotypes [19].