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Related Experiment Videos

Malaria and Widal reaction.

K K Samal1, C S Sahu

  • 1VSS Medical College, Burla.

The Journal of the Association of Physicians of India
|October 1, 1991
PubMed
Summary
This summary is machine-generated.

The Widal test may show false positives in malaria patients. This study found positive Widal reactions in malaria cases, but Salmonella typhi was not detected, suggesting a cross-reaction.

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Area of Science:

  • Infectious Diseases
  • Clinical Microbiology
  • Tropical Medicine

Background:

  • Malaria and typhoid fever are significant public health concerns, particularly in endemic regions.
  • Co-infection with malaria and typhoid fever can complicate diagnosis and treatment.
  • The Widal test is commonly used for typhoid fever diagnosis, but its specificity can be affected by other infections.

Purpose of the Study:

  • To investigate the occurrence and implications of positive Widal reactions in patients with confirmed malaria.
  • To determine if malaria infections can cause false-positive Widal test results for Salmonella typhi.

Main Methods:

  • Studied 52 patients with malaria parasites in peripheral blood smears (Plasmodium vivax, Plasmodium falciparum, and mixed infections).
  • Performed Widal tests for Salmonella typhi O and H antigens on all malaria patients.

Related Experiment Videos

  • Conducted blood cultures for Salmonella typhi in patients with positive Widal reactions.

    • Main Results:

    • Positive Widal reactions were observed in 8 out of 52 malaria patients (15.4%).
    • No Salmonella typhi was isolated from blood cultures in any of the patients with positive Widal tests.
    • All patients with malaria and positive Widal reactions were successfully treated with antimalarial therapy.

    Conclusions:

    • The Widal test may yield false-positive results in patients with malaria.
    • Malaria infection should be considered as a potential cause of false-positive Widal reactions.
    • Further investigation is needed to understand the immunological basis of this cross-reactivity.