Table 2

Serum LPS antibody responses to S. Typhi, S. Paratyphi A, and S. Paratyphi B

IgSerovarPeak fold Ab increasea (mean ± SE)P value compared to:Hierarchy of response
S. TyphiS. Paratyphi A
IgAS. Typhi5.42 ± 1.54S. Typhi = S. Paratyphi B = S. Paratyphi A
S. Paratyphi A3.50 ± 0.400.89
S. Paratyphi B4.47 ± 0.990.670.62
IgGS. Typhi4.49 ± 0.76S. Typhi = S. Paratyphi B = S. Paratyphi A
S. Paratyphi A4.46 ± 0.990.56
S. Paratyphi B3.47 ± 0.530.550.8
  • a Peak postvaccination fold increase in Ab titer at day 7 or 42 compared to corresponding prevaccination level.