Blood-stage P. cynomolgi parasitemia results and drug regimens for each treatment group. Displays the number of P. cynomolgi blood-stage parasites per μl of blood observed via microscopy. Shaded areas represent the duration of drug administration when daily drug dosing was administered, with yellow for ivermectin, peach for chloroquine, blue for ivermectin plus chloroquine, and green for primaquine plus chloroquine. Drug concentrations are stated as numbers, and all quantities displayed are in mg/kg. Numbers (i.e., Rxxx) in the legend denote the individual macaque identification number. The red arrows indicate when sporozoites were administered. The dashed red line denotes the 5,000 parasites per μl cutoff to trigger drug administration. IVM, ivermectin; CQ, chloroquine; PQ, primaquine.