Lab Med Online.  2019 Jul;9(3):194-196. 10.3343/lmo.2019.9.3.194.

A Case of False-negative Malaria Rapid Diagnostic Test Induced by Treatment with Doxycycline

Affiliations
  • 1Department of Laboratory Medicine, College of Medicine, Hanyang University, Seoul, Korea. doceunjung@hanyang.ac.kr

Abstract

Rapid diagnostic tests (RDTs) for malaria using antibodies against pan-Plasmodium antigen lactate dehydrogenase (pLDH) are commonly used for malaria diagnosis. The level of malaria parasitemia determined by peripheral blood smears (PBS) correlates with the pLDH concentration in most cases. We report a case of malaria recurrence associated with false-negative RDT results. A 22-year-old male patient was admitted to the Armed Forces Capital Hospital with fever and chills, and was diagnosed with malaria infection. Four days after antimalarial treatment, these symptoms recurred. After admitting to our hospital, doxycycline was administered for 4 days. Even after administration of doxycycline, the malaria parasites in blood smears remained positive, but RDT showed negative results. Therefore, for patients receiving doxycycline, serial blood smear testing should be performed to exclude false-negative malaria RDT results.

Keyword

Malaria; Rapid diagnostic test; Peripheral blood smear; Doxycycline; Lactate dehydrogenase
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