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Association among malariometric parameters, altitude, and age. Prevalence of parasitemia (Left) and IgG antibodies to MSP-119 (Right) by village altitude (m) for individual age groups (data from both surveys combined). Individuals aged 12–24 months (a), 3–4 years (b), 5–9 years (c), or 26–45 years (d). The lines represent logistic functions fitted for each transect. □, West Usambara transect; Δ, South Pare transect; ○, North Pare transect.
