Whole blood-mediated killing of isolates K1, K5 and non-
Escherichia coli. LOG CFU/mL of bacteria 1 h post-incubation in RPMI washed whole blood (A) or heparinized-whole blood (B) recovered from seronegative (dark bars) or seropositive (clear bars) African Green monkey. The error bars represent standard errors for triplicate samples, and the results shown are representative of three independent experiments. Treatments with different letters are significantly different from one another at p < 0.05. Asterisk indicates significant difference between treatments, p ≤ 0.05; Double asterisk indicates significant difference between treatments, p ≤ 0.001; Equal to indicates similarity between treatments, p > 0.05.