Am J Trop Med Hyg. 2001 Nov;65(5):588-92.

Identification of cryptic coinfection with Plasmodium falciparum in patients presenting with vivax malaria.

Mayxay M, Pukritrayakamee S, Chotivanich K, Imwong M, Looareesuwan S, White NJ.

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Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand.

Abstract

In Thailand, approximately 8% of patients treated for vivax malaria are found subsequently to have coinfection with Plasmodium falciparum. A P. falciparum histidine rich protein 2 (PfHRP-2) dipstick test was evaluated as a predictor of mixed infections with subpatent P. falciparum in a prospective study of 238 patients admitted to the hospital with acute vivax malaria. Of these, 23 (10%) had subsequent development of falciparum malaria without reexposure. Patients with cryptic P. falciparum infection had a significantly lower mean (standard deviation) hematocrit than those with P. vivax alone: 29.6 (7.6%) versus 37.2 (6.4%) (P < 0.0001). Using microscopic appearance of P. falciparum after the start of treatment as the reference standard, the PfHRP-2 test was 74% sensitive and 99% specific in predicting mixed infections with subpatent P. falciparum parasitemia at presentation. The PfHRP-2 dipstick test may be a useful adjunct to microscopy in areas where mixed infections are common.

PMID:: 11716119; [PubMed - indexed for MEDLINE]

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Identification of cryptic coinfection with Plasmodium falciparum in patients presenting with vivax malaria.

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