Figure 1

Real-time PCR amplification of S . Typhi and S . Paratyphi A in blood and bone marrow specimens from patients with culture confirmed enteric fever. The Ct values of amplification positive blood and bone marrow specimens have been converted by dilution factor to copies per ml of biological material (y axis). The median and quartile ranges of the number of copies per ml of biological sample are shown for amplification positive blood samples with S. Paratyphi A (n = 18), amplification positive blood samples with S. Typhi (n = 23) and amplification positive bone marrow samples with S. Typhi (n = 28). Statistical significance was calculated using a none-parametric student's t-test.