TABLE 2.

Associations between LPS O-antigen serotypes and patients' diseases

SerotypeaNo. of isolates from patients (% of total in subgroup) with:Relative risk (95% confidence interval)
Acute infection (n = 68)Chronic infection (n = 31)
O112 (17.6)b1 (3.2)1.4 (1.1-1.8)
O119 (13.2)c0 (0.0)1.5 (1.3-1.8)
O16 (23.5)d21 (67.7)3.5 (1.9-6.6)
  • a Serotype O4 was found in 4 (23.5%) of the 17 isolates from patients who died and in 4 (4.9%) of the 82 isolates from patients who survived (P = 0.03; relative risk, 3.5 [95% confidence interval, 1.5 to 8.2]).

  • b Significantly different from chronic infection group, P = 0.04 (Fisher's exact test).

  • c Significantly different from chronic infection group, P = 0.03 (Fisher's exact test).

  • d Significantly different from chronic infection group, P < 0.0001 (Fisher's exact test).