Figure 1

Study design. Blood samples were collected in four survey rounds (R1-R4), on day 1, 2, 7 and 8. The result of this study design are two sampling intervals of 1 day, one of 5, two of 6, and one of 7 days. A 48-hour periodicity of P. falciparum detectability could therefore be identified, as it should show positive correlation of detection outcomes between surveys with even-numbered interval length, and negative correlation between surveys with odd-numbered interval length (in days).