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Table 4 Prevalence and combination of virulence genes among 198 ESC-resistant Shigella isolates

From: Epidemic and virulence characteristic of Shigella spp. with extended-spectrum cephalosporin resistance in Xiaoshan District, Hangzhou, China

Isolate Serotype No. (%) of isolates that produced the following: No. (%) of isolates that contained the following combination of genes
ial ipaH virA set1A set1B sen I II III IV V
S. flexneri (n = 58) 1a (n = 2) 2 (3.4) 2 (3.4) 2 (3.4) 0 (0.0) 0 (0.0) 2 (3.4) 0 (0.0) 2 (3.4) 0 (0.0) 0 (0.0) 0 (0.0)
2a (n = 37) 37(63.8) 37 (63.8) 37 (63.8) 36 (62.1) 36 (62.1) 37 (63.8) 0 (0.0) 1 (1.7) 0 (0.0) 0 (0.0) 36 (62.1)
2b (n = 2) 2 (3.4) 2 (3.4) 2 (3.4) 0 (0.0) 0 (0.0) 2 (3.4) 0 (0.0) 2(3.4) 0 (0.0) 0 (0.0) 0 (0.0)
2c (n = 5) 5 (8.6) 5 (8.6) 5 (8.6) 0 (0.0) 0 (0.0) 5 (8.6) 0 (0.0) 5 (8.6) 0 (0.0) 0 (0.0) 0 (0.0)
4c (n = 12) 12(20.7) 12 (20.7) 12 (20.7) 10 (17.2) 10 (17.2) 12 (20.7) 0 (0.0) 2 (3.4) 0 (0.0) 0 (0.0) 10 (17.2)
  58 (100) 58 (100) 58 (100) 46 (79.3) 46 (79.3) 58 (100) 0 (0.0) 12 (20.7) 0 (0.0) 0 (0.0) 46 (79.3)
S. sonnei (n = 140)   140(100) 140(100) 140(100) 12 (8.6) 19 (13.6) 138(98.6) 2 (1.4) 114 (81.4) 5 (3.6) 12 (8.6) 7 (5.0)
S. flexneri vs S. sonnei (p value)   NA NA NA <0.001 0.003 0.360 0.364 <0.001 0.603 0.021 <0.001
Total   198(100) 198(100) 198(100) 58 (29.3) 65 (32.8) 196 (99.0) 2 (1.0) 123(62.1) 8 (4.0) 12 (6.1) 53 (26.8)
  1. p < 0.05 were considered statistically significant.
  2. I, ia1 + ipaH + virA; II, ia1 + ipaH + vir + sen; III, ia1 + ipaH + virA + setlA + sen; IV, ia1 + ipaH + virA + setlB + sen; V, ia1 + ipaH + virA + setlA + setlB + sen.
  3. NA, not available.