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Table 2 Comparison of resistance patterns between Shigella flexneri and Shigella sonnei isolated in southern Vietnam between 1995 and 2008.

From: A changing picture of shigellosis in southern Vietnam: shifting species dominance, antimicrobial susceptibility and clinical presentation

Collection Serotype (n) Phenotypeb AMP CHL SXT TET NAL OFX CRO
A (1995 - 1996) sonnei (24) R 11 8 23 23 0 0 0
   S 13 16 1 1 24 24 24
  flexneri (56) R 54 10 53 53 9 0 0
   S 2 46 3 3 47 56 56
p Valuea    < 0.0001 0.1287 0.8102 0.8102 0.0371 - -
B (2000 - 2002) sonnei (54) R 50 10 53 52 9 0 1
   S 4 44 1 2 45 54 53
  flexneri (50) R 46 38 44 49 21 0 0
   S 4 12 6 1 29 50 50
p Valuea    0.9316 < 0.0001 0.0415 0.5577 0.0052 - 0.329
C (2007 - 2008) sonnei (71) R 17 5 71 69 51 0 12
   S 54 66 0 2 20 71 59
  flexneri (30) R 25 28 28 30 19 1 1
   S 5 2 2 0 11 29 29
p Valuea    < 0.0001 < 0.0001 < 0.0001 0.3696 0.4619 0.297 0.076
Combined sonnei (148) R 78 23 147 144 60 0 13
   S 70 125 1 4 88 148 135
  flexneri (136) R 125 76 125 132 49 1 1
   S 11 60 11 4 87 135 135
p Valuea    < 0.0001 < 0.0001 0.001 0.613 0.365 0.478 0.002
  1. a p Value calculated using the chi-squared test
  2. b Phenotype with respect to Resistant (R) or Sensitive (S)
  3. AMP; Ampicillin, CHL; Chloramphenicol, SXT; Trimethoprim- Sulfamethoxazole, TET; Tetracycline, NAL; Nalidixic Acid, OFX; Ofloxacin, CRO; Ceftriaxone.