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Why is Plasmodium knowlesi an important cause of malaria in Southeast Asia?
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malaria
Life cycle of a malaria parasite.
Plasmodium knowlesi is a significant cause of malaria in Southeast Asia, where it has been identified as responsible for up to 70 percent of cases in certain regions. Its importance stems from several key factors:1
- Diagnostic Challenges: P. knowlesi is frequently misidentified during microscopic examination because it closely resembles P. malariae. Consequently, many infections historically attributed to the latter were likely caused by P. knowlesi.1
- Rapid Life Cycle: Unlike other human Plasmodium species that have 48- or 72-hour cycles, P. knowlesi possesses the shortest life cycle of any known human Plasmodium pathogen, lasting only 24 hours. This results in daily spikes in fever as the parasites rupture from infected red blood cells.21
- Zoonotic Nature: Previously thought to infect primarily Old World monkeys and only rarely affect humans, it is now recognized as a major human pathogen in the region.1