Figure 2.

Yearly incidence per month per three age groups in a cohort of 537 children on Pemba Island by 4 malaria definitions. Any fever (green); fever and confirmed microscopy with greater than 100 parasites/microliter (blue); documented fever and greater than 1,000 parasites or any fever and greater than 3,000 parasites or greater than 8,000 parasites (orange); and any fever and parasites greater than 5,000/microliter (brown). Age at start of study A) ≤ 6 months; B) 7-12 months; and C) 13-22 months. Cells with less than 500 days of risk in the denominator were omitted from the analysis.