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Table 1 Distribution of S. flexneri and S. sonnei serotypes in Beijing between 1994 and 2010

From: Changing trends and serotype distribution of Shigella species in Beijing from 1994 to 2010

  No. (%) of isolates
Surveillance time Total S. flexneri serotype 1a S. flexneri serotype 1b S. flexneri serotype 2a S. flexneri serotype 2b S. flexneri serotype 3a S. flexneri serotype 3b S. flexneri serotype 4a S. flexneri serotype 4b S. flexneri serotype 4c S. flexneri serotype 5 S. flexneri serotype 6 S. flexneri serotype x S. flexneri serotype y S. sonnei
1994 615 (10.36) 113 (18.37) 0 (0.00) 262 (42.60) 3 (0.49) 0 (0.00) 0 (0.00) 3 (0.49) 3 (0.49) 2 (0.33) 1 (0.16) 2 (0.33) 0 (0.00) 1 (0.16) 225 (36.59)
1995 793 (13.36) 4 (0.50) 1 (0.13) 632 (79.69) 0 (0.00) 2 (0.25) 0 (0.00) 14 (1.77) 2 (0.25) 10 (1.26) 0 (0.00) 8 (1.01) 5 (0.63) 20 (2.52) 95 (11.98)
1996 1192 (20.09) 5 (0.42) 1 (0.08) 984 (82.55) 0 (0.00) 6 (0.50) 0 (0.00) 23 (1.93) 2 (0.17) 28 (2.35) 1 (0.08) 3 (0.25) 4 (0.34) 21 (1.76) 114 (9.56)
1997 474 (7.99) 2 (0.42) 0 (0.00) 365 (77.02) 0 (0.00) 1 (0.21) 0 (0.00) 4 (0.84) 1 (0.21) 6 (1.26) 1 (0.21) 0 (0.00) 6 (1.26) 9 (1.90) 79 (16.65)
1998 600 (10.11) 1 (0.17) 2 (0.33 340 (56.67) 0 (0.00) 0 (0.00) 0 (0.00) 0 (0.00) 3 (0.50) 4 (0.67) 0 (0.00) 3 (0.50) 8 (1.33) 11 (1.83) 228 (38.00)
1999 475 (8.00) 6 (1.26) 3 (0.63) 192 (40.42) 3 (0.63) 11 (2.32) 2 (0.42) 4 (0.84) 2 (0.42) 2 (0.42) 2 (0.42) 24 (5.05) 54 (11.37) 23 (4.84) 147 (30.95)
2000 433 (7.30) 7 (1.62) 1 (0.23) 132 (30.48) 19 (4.39) 7 (1.62) 0 (0.00) 0 (0.00) 2 (0.46) 3 (0.69) 23 (5.31) 8 (1.85) 16 (3.70) 7 (1.62) 208 (48.04)
2001 214 (3.61) 1 (0.47) 1 (0.47) 81 (37.85) 6 (2.80) 0 (0.00) 1 (0.47) 11 (5.14) 1 (0.47) 15 (7.01) 0 (0.00) 1 (0.47) 4 (1.87) 0 (0.00) 92 (42.99)
2002 397 (6.69) 8 (2.02) 0 (0.00) 116 (29.14) 57 (14.37) 0 (0.00) 0 (0.00) 13 (3.28) 3 (0.76) 11 (2.77) 1 (0.25) 1 (0.25) 43 (10.84) 8 (2.02) 136 (34.30)
2003 88 (1.48) 4 (4.55) 2 (2.27) 13 (14.77) 15 (17.05) 0 (0.00) 0 (0.00) 12 (13.64) 7 (7.95) 9 (10.23) 0 (0.00) 0 (0.00) 9 (10.23) 4 (4.55) 13 (14.77)
2004 247 (4.16) 4 (1.62) 1 (0.41) 7 (2.68) 16 (6.49) 3 (1.22) 0 (0.00) 58 (23.52) 8 (3.24) 65 (26.36) 1 (0.41) 0 (0.00) 17 (6.89) 2 (0.81) 65 (26.36)
2005 148 (2.49) 3 (2.03) 0 (0.00) 9 (5.96) 11 (7.44) 0 (0.00) 0 (0.00) 25 (16.91) 3 (2.03) 30 (20.30) 0 (0.00) 3 (2.03) 7 (4.74) 1 (0.68) 56 (37.89)
2006 112 (1.89) 7 (6.25) 1 (0.89) 11 (9.83) 6 (5.36) 0 (0.00) 0 (0.00) 5 (4.46) 7 (6.25) 0 (0.00) 0 (0.00) 0 (0.00) 4 (3.57) 2 (1.79) 69 (61.60)
2007 74 (1.25) 5 (6.77) 0 (0.00) 10 (13.40) 1 (1.35) 0 (0.00) 0 (0.00) 1 (1.35) 2 (2.71) 1 (1.35) 0 (0.00) 0 (0.00) 1 (1.35) 1 (1.35) 52 (70.36)
2008 17 (0.29) 1 (5.81) 0 (0.00) 2 (12.80) 1 (5.81) 0 (0.00) 0 (0.00) 0 (0.00) 1 (5.81) 2 (11.63) 0 (0.00) 0 (0.00) 0 (0.00) 0 (0.00) 10 (58.14)
2009 31 (0.52) 0 (0.00) 0 (0.00) 1 (3.54) 0 (0.00) 0 (0.00) 0 (0.00) 0 (0.00) 0 (0.00) 0 (0.00) 0 (0.00) 0 (0.00) 0 (0.00) 0 (0.00) 30 (96.46)
2010 24 (0.40) 0 (0.00) 1 (4.11) 3 (13.59) 0 (0.00) 0 (0.00) 0 (0.00) 0 (0.00) 0 (0.00) 0 (0.00) 0 (0.00) 0 (0.00) 0 (0.00) 0 (0.00) 20 (82.30)
Total 5,934 (100) 171 (2.88) 14 (0.24) 3,160 (53.25) 138 (2.33) 30 (0.51) 3 (0.05) 173 (2.92) 47 (0.79) 188 (3.17) 30 (0.51) 53 (0.89) 178 (3.00) 110 (1.85) 1,639 (27.62)