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Alveolates are a group of organisms recognized by the presence of alveoli, which are cytoplasmic sacs located beneath the cell membrane. While their function remains uncertain, alveoli may help regulate water balance by controlling how much water enters and leaves the cell. In dinoflagellates, these structures may serve as armor plates. There are three major types of alveolates: ciliates, which move using cilia; dinoflagellates, which use flagella for movement; and apicomplexans, which are...
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Plasmodium knowlesi infection: a diagnostic challenge.

Lijia Fan1, Shir Ying Lee, Evelyn Koay

  • 1Department of Paediatrics, National University Health System, Singapore, Singapore. Li_jia_fan@nuhs.edu.sg

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A Plasmodium knowlesi malaria case in a young traveler highlights diagnostic challenges. Early detection using PCR is crucial for effective treatment of this uncommon but prevalent infection.

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Area of Science:

  • Tropical Medicine
  • Infectious Diseases
  • Parasitology

Background:

  • Plasmodium knowlesi malaria is a significant parasitic infection in Malaysia.
  • Its clinical presentation can mimic other Plasmodium species, complicating diagnosis.
  • Travelers returning from endemic areas are at risk.

Observation:

  • A 14-year-old boy presented with fever after traveling to Malaysia.
  • Initial antigen tests were negative; blood film showed atypical Plasmodium.
  • Clinical findings included hepatosplenomegaly, thrombocytopenia, lymphopenia, anemia, and transaminitis.

Findings:

  • Polymerase chain reaction (PCR) confirmed Plasmodium knowlesi infection.
  • The patient's parasite load was 0.5%.
  • Chloroquine treatment was successful.

Implications:

  • Plasmodium knowlesi malaria diagnosis requires detailed travel history and expert blood film review.
  • Antigen tests and standard blood films can lead to misdiagnosis or missed diagnoses.
  • Third-generation PCR assays provide reliable identification of Plasmodium knowlesi, crucial for differentiating from P. falciparum and P. malariae.