Human movements and revisiting of polygonal rubber plantations. (A) Effect of revisiting rubber plantations on initial
time of exposure for rubber tappers (living in malaria-free low-lying households) that routinely practice rubber tapping and/or
rubber sheet processing at smallholdings confined to malaria transmission foci. Continuations of these practices (red) at small
farms are considered rubber tapping-associated exposures. These people are susceptible to multiple bites from Anopheles at
multiple locations over a longer exposure time. (B) Returning from rubber plantations with or without being exposed to multiple
Anopheles bites. If clinical malaria or prodromal infections are absent, this is considered a no risk (green) for malaria zone; usually,
rubber tappers revisit rubber plantations on subsequent days. (For interpretation of the references to color in this figure legend,
the reader is referred to the web version of this article.)