Veterinarians from the Aceh Natural Resources Conservation Center in collaboration with the Public Health Service staff examine and take blood and feces samples from wild long-tailed monkeys (Macaca Fasclularis) in Weh Island, Sabang, Indonesia, 13 December 2021. Sampling and laboratory examination of the blood of wild long-tailed monkeys (Macaca Fasclularis) is done to detect the spread of malaria knowlesi that is spread by monkeys to humans. (Photo by Hotli Simanjuntak/EPA/EFE)
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