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EVALUATION OF THREE RAPID TESTS FOR DIAGNOSIS OF P. FALCIPARUM AND P. VIVAX MALARIA IN COLOMBIA

INGRID VAN DEN BROEKMédecins sans Frontières (MSF), London, UK; Médecins sans Frontières, Bogota, Colombia; Epicentre, Paris, France

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OLIVIA HILLMédecins sans Frontières (MSF), London, UK; Médecins sans Frontières, Bogota, Colombia; Epicentre, Paris, France

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FABIOLA GORDILLOMédecins sans Frontières (MSF), London, UK; Médecins sans Frontières, Bogota, Colombia; Epicentre, Paris, France

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BIBIANA ANGARITAMédecins sans Frontières (MSF), London, UK; Médecins sans Frontières, Bogota, Colombia; Epicentre, Paris, France

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PRUDENCE HAMADEMédecins sans Frontières (MSF), London, UK; Médecins sans Frontières, Bogota, Colombia; Epicentre, Paris, France

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HELEN COUNIHANMédecins sans Frontières (MSF), London, UK; Médecins sans Frontières, Bogota, Colombia; Epicentre, Paris, France

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JEAN-PAUL GUTHMANNMédecins sans Frontières (MSF), London, UK; Médecins sans Frontières, Bogota, Colombia; Epicentre, Paris, France

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The diagnostic capacity of three malaria rapid diagnostic tests (RDTs), NOW-Malaria-ICT, OptiMAL-IT, and Paracheck-Pf, was evaluated against expert microscopy in Colombia. We tested 896 patients, of whom microscopy confirmed 139 P. falciparum, 279 P. vivax, and 13 mixed P.f/P.v infections and 465 negatives. Paracheck-Pf and NOW-malaria-ICT were more accurate in detecting P. falciparum (sensitivities 90.8% and 90.1%, respectively) in comparison with Optimal-IT (83.6%). NOW showed an acceptable Pf detection rate at low densities (< 500/μL), but resulted in a higher proportion of false positives. For P. vivax diagnosis, Optimal-IT had a higher sensitivity than NOW (91.0% and 81.4%, respectively). The choice between the two Pf/Pv detecting RDTs balances P. falciparum and P. vivax detection rates. Considering some degree of P. falciparum overtreatment and failure to detect all P. vivax cases as more acceptable than missing some cases of P. falciparum, we recommend careful implementation of NOW-malaria-ICT in areas where microscopy is lacking. The price is however still a constraint.

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