Table 3. Prevalence and levels of antibody responses to PfMSP1p19 in the three cohorts.

	Ab responses against PfMSP1p19
	Dielmo Year 2002	Ndiop Year 2002	Ndiop Year 2000
Mean OD/median-[range]	0.79/0.55[0.01–1.7]	0.86/0.80 [0–1.96]	0.94/0.79 [0.0–2.69]
Mean ODratio/median-[range]	7.9/5.3 [1–16.9]	6.0/5.5 [1–18.0]	7.9/6.7 [1–22.7]
Prevalence of responders*	73%	74%	78%
Prevalence in younger individuals**	68% (n = 19)	60% (n = 85)	65% (n = 80)
Prevalence in older inviduals	74% (n = 167)	83% (n = 136)	87% (n = 124)

*Individuals with positive IgG response =  ODratio>2 ie > OD of naive control + 2SD.

**Younger individuals : in Dielmo ie <7 years old; in Ndiop ie <15 years old.