FIG 2.
Body weight change and spleen size evaluation of all infected and noninfected samples. (A) Percentage of Rickettsia rickettsii-infected guinea pig body weight change. The weight was measured on days 1 and 6 of infection. (C) Spleen index at 6 days postinoculation. The spleen weight index was calculated based on the final body weight. +, mean value. (B and D) Comparative pairwise differences (95% CI) in mean percentage change in body weight by groups of isolates and spleen index, respectively, with the null reference line at 0. Differences in CIs that do not contain 0 are considered statistically significant at 5% significance. IO, Iowa; SAW, Sawtooth; GIL, Gila; SS, Sheila SmithT; CORI, Costa Rica; TAI, Taiaçu.