Figure 1: Determination of infection severity: BALB/C and C57BL/6 derived macrophages were challenged with the stationary phase of promastigotes. Smears were taken and stained by Giemsa method from BALB/c (white bar) and C57BL/6 derived macrophages (black bar) for infection severity. (A) Infection rate as the percentage of infected macrophage cells. (B) Parasite burden as the mean number of parasites/ macrophage. Data was shown as mean ± SEM and P£0.05 defined as significant level.