TABLE 1.

Demographic characteristics of the selected subsets of volunteers

Characteristic	Value for volunteers who were:
	Exposed	Uninfected
Age	37 (19–63)a	39 (20–67)
Proportion male	0.71	0.71
% infected (of total visits)b	50 (14.2–100)	0
No. of visits attended	13 (11–14)	14

^aData are shown as the median, with the range in parentheses when applicable.

^bPercentage of visits at which the volunteer was positive by qPCR for Plasmodium vivax blood-stage malaria.