Susceptibility of gerbils to P. berghei ANKA (PbA) infection. Gerbils were infected intraperitoneally with different concentrations of PbA-infected red blood cells (pRBCs). Survival and parasitemia were monitored daily and every 2 days (respectively). a. Survival of gerbils according to the concentration of pRBC. b. Parasitemia level of PbA-infected gerbils according to the concentration of PbA, over 13 days post-infection. Lines represent mean ± S.E.M., N = 5 per group. A logrank (Mantel-cox) test was used to compare survival curves, *p < 0.05. One-way analysis of variance (ANOVA) was used to compare the differences in the level of parasitemia between the groups, p > 0.05.