alexa False positive malaria rapid diagnostic test in returning traveler with typhoid fever.
Haematology

Haematology

Journal of Blood Disorders & Transfusion

Author(s): Meatherall B, Preston K, Pillai DR, Meatherall B, Preston K, Pillai DR

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Abstract BACKGROUND: Rapid diagnostic tests play a pivotal role in the early diagnosis of malaria where microscopy or polymerase chain reaction are not immediately available. CASE PRESENTATION: We report the case of a 39 year old traveler to Canada who presented with fever, headache, and abdominal pain after visiting friends and relatives in India. While in India, the individual was not ill and had no signs or symptoms of malaria. Laboratory testing upon his return to Canada identified a false positive malaria rapid diagnostic (BinaxNOW® malaria) result for P. falciparum with coincident Salmonella Typhi bacteraemia without rheumatoid or autoimmune factors. Rapid diagnostic test false positivity for malaria coincided with the presence or absence of Salmonella Typhi in the blood. CONCLUSIONS: Clinicians should be aware that Salmonella Typhi infection may result in a false positive malaria rapid diagnostic test. The mechanism of this cross-reactivity is not clear.
This article was published in BMC Infect Dis and referenced in Journal of Blood Disorders & Transfusion

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