FIG. 7.

Ability of C57BL/6 mice challenged with 10² (●) or 10⁶ (□) L. major metacyclic promastigotes to transmit parasites to P. papatasi. Individual footpads of infected mice (4 to 6 mice per group at each time point) were exposed to 15 to 20 sand flies for 2 h. Blood-fed females from each vial were separated and dissected after 48 to 72 h and examined microscopically for the presence of promastigotes. Results are pooled from two separate experiments and are expressed as the percentages of the total numbers of blood-fed flies that were positive for promastigotes at each time point.