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An Ultra-Sensitive Technique: Using -mtCOX1 QPCR to Detect Early Recurrences of in Patients in the Brazilian Amazon

Abstract

Background: Early recurrence of is a challenge for malaria control in the field, particularly because this species is associated with lower parasitemia, which hinders diagnosis and monitoring through blood smear testing. Early recurrences, defined as the persistence of parasites in the peripheral blood despite adequate drug dosages, may arise from resistance to chloroquine. The objective of the study was to estimate early recurrence of in the Brazilian Amazon by using a highly-sensitive detection method, in this case, PCR.

Methods: An ultra-sensitive qPCR that targeted mitochondrial DNA was used to compare a standard qPCR that targeted 18S rDNA to detect early recurrence of in very low densities in samples from patients treated with chloroquine.

Results: Out of a total of 312 cases, 29 samples (9.3%) were characterized as recurrences, from which 3.2% (10/312) were only detected through ultra-sensitive qPCR testing.

Conclusions: Studies that report the detection of early recurrences using light microscopy may severely underestimate their true incidence.

Citing Articles

Advances in Malaria Diagnostic Methods in Resource-Limited Settings: A Systematic Review.

Yalley A, Ocran J, Cobbinah J, Obodai E, Yankson I, Kafintu-Kwashie A Trop Med Infect Dis. 2024; 9(9).

PMID: 39330879 PMC: 11435979. DOI: 10.3390/tropicalmed9090190.

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