Evaluation of two rapid diagnostic tests, NOW® ICT Malaria Pf/Pv and OptiMAL®, for diagnosis of malaria

Nohora Marcela Mendoza, Marisol García, Liliana Jazmín Cortés, Claudia Vela, Rigoberto Erazo, Pilar Pérez, Olga Lucía Ospina, Javier Darío Burgos, .

Keywords: malaria/diagnosis, sensitivity and specificity, parasitemia, Plasmodium vivax, Plasmodium falciparum, Colombia

Abstract

Introduction. To increase the accessibility of malaria diagnosis, the Instituto Nacional de Salud de Colombia undertook a field trial to evaluate the sensitivity and specificity of two rapid diagnostic tests.
Objective. The sensitivity, specificity and concordance was compared for two rapid diagnostic tests for malaria, NOW® ICT Malaria Pf/Pv and OptiMAL®,
Materials and methods. A descriptive and concordance study was performed with 214 patients in the southwestern coastal city of Tumaco, Colombia, each of whom presented at least one of the symptoms of the classical malaria triad. Two strategies were applied for patient recruitment-one by passive search and a second through local health brigades.
Results. NOW® ICT showed a general sensitivity of 98.4% (95%CI: 90.3-99.9), and a general specificity of 98.0% (95%CI: 93.9-99.5). For Plasmodium falciparum, the sensitivity was 98.2% (95%CI: 89.4-99.9) and the specificity 98.1% (95%CI: 94.1-99.5). The sensitivity was lower (80.0%) when parasitemia ranged from 200 to 4,000 parasites/ μl. The sensitivity and specificity of the NOW® ICT for P. vivax malaria were 100%. The sensitivity for this test was not affected for the established ranges of parasitemia for P. vivax. The overall figures for OptiMAL® were 95.2% (95%CI: 85.8-98.8) sensitivity and 99.3% (95%CI: 95.8-100.0) specificity. For P. falciparum malaria OptiMAL® showed 94.7% (95%CI: 84.5-98.6) sensitivity and 99.4% (95%CI: 96.0-100.0) specificity. The sensitivity was lower (60.0%) when samples with 200-4,000 parasites/μl were tested. For P. vivax, OptiMAL® presented a 66.7% (95%CI: 24.1-94.0) sensitivity, which diminished to 50% with a parasitemia between 300-2.500 parasites/ μL.
Conclusions. Good results for sensitivity and specificity were obtained for malaria diagnosis using NOW® ICT and OptiMAL®, with NOW®ICT showing higher sensitivity and specificity values than OptiMAL®.

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  • Nohora Marcela Mendoza Grupo de Parasitología, Red Nacional de Laboratorios, Instituto Nacional de Salud, Bogotá, D.C., Colombia
  • Marisol García Grupo de Parasitología, Red Nacional de Laboratorios, Instituto Nacional de Salud, Bogotá, D.C., Colombia
  • Liliana Jazmín Cortés Grupo de Parasitología, Red Nacional de Laboratorios, Instituto Nacional de Salud, Bogotá, D.C., Colombia
  • Claudia Vela Instituto Departamental de Nariño, Pasto, Colombia
  • Rigoberto Erazo Instituto Departamental de Nariño, Pasto, Colombia
  • Pilar Pérez Instituto Departamental de Nariño, Pasto, Colombia
  • Olga Lucía Ospina Instituto Departamental de Nariño, Pasto, Colombia
  • Javier Darío Burgos Instituto de Estudios Ambientales (IDEA), Universidad Nacional de Colombia, Bogotá, D.C., Colombia

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How to Cite
1.
Mendoza NM, García M, Cortés LJ, Vela C, Erazo R, Pérez P, et al. Evaluation of two rapid diagnostic tests, NOW® ICT Malaria Pf/Pv and OptiMAL®, for diagnosis of malaria. biomedica [Internet]. 2007 Dec. 1 [cited 2024 May 18];27(4):571-80. Available from: https://revistabiomedica.org/index.php/biomedica/article/view/174

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Published
2007-12-01
Section
Original articles

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