Table 1. Infectiousness of submicroscopic parasite carriers versus slide-positive carriers.

Study	Country	N people	N mosquitoes	% Mosquitoes infected, slide-positives	% Mosquitoes infected, submicroscopic infections
Ouedraogo 2011 (ALO, unpublished data)	Burkina Faso	260	10,244	12.8	3.2
Jeffery and Eyles29	USA	95	10,096	20.3	2.0
Coleman et al.30	Thailand	237	9,210	0.4	0.2*
Young et al.7	USA	124	6,600	8.4	0.5*

Proportion of mosquitoes infected during human-to-mosquito transmission studies. In two of these studies, the prevalence of submicroscopic carriage among microscopy-negatives was not assessed and therefore this was estimated using the relationship in Fig. 1a.

^*Prevalence of submicroscopic carriers estimated.