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Figure 4 | Malaria Journal

Figure 4

From: Clustered local transmission and asymptomatic Plasmodium falciparum and Plasmodium vivax malaria infections in a recently emerged, hypoendemic Peruvian Amazon community

Figure 4

Spatial and temporal clustering of P. falciparum (Pfalc) infections within at-risk zones. Pfalc detection prompted our selection of sentinel houses within at-risk zones in the following month. There was clustering of infections (outlined in black) in the same and adjacent houses. The houses followed a general linear arrangement, with consecutive numbers being contiguous houses. Generally, the house numbers wrap around in opposite order for opposing houses located across a street. Human subjects concern prohibits display of more precise house locations. All persons with active case detection are shown (except for ZG, where, for simplicity and space constraints, the many households that were negative for Pfalc are not listed). Asterisks are passive case detections in the Health Post occurring within the sentinel houses. The index houses defining at-risk zones for the following month are shown in green font. Active sampling events are shown as a ratio. The numbers of Pfalc infected individuals detected in the household are shown as the numerator. The numbers of persons in the house participating as sentinels are shown as the denominator. There were four instances of persons living in two houses: where members were sampled within one of the two houses and reported frequently eating diner and sleeping in both houses (these are shown as dashed-house codes).

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