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. 2016:23:34.
doi: 10.1051/parasite/2016034. Epub 2016 Aug 26.

Distribution of Plasmodium species on the island of Grande Comore on the basis of DNA extracted from rapid diagnostic tests

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Distribution of Plasmodium species on the island of Grande Comore on the basis of DNA extracted from rapid diagnostic tests

Nasserdine Papa Mze et al. Parasite. 2016.

Abstract

In the Union of Comoros, interventions for combating malaria have contributed to a spectacular decrease in the prevalence of the disease. We studied the current distribution of Plasmodium species on the island of Grande Comore using nested PCR. The rapid diagnostic tests (RDTs) currently used in the Comoros are able to identify Plasmodium falciparum but no other Plasmodium species. In this study, we tested 211 RDTs (158 positive and 53 negative). Among the 158 positive RDTs, 22 were positive for HRP2, 3 were positive only for pLDH, and 133 were positive for HRP2 and pLDH. DNA was extracted from a proximal part of the nitrocellulose membrane of RDTs. A total of 159 samples were positive by nested PCR. Of those, 156 (98.11%) were positive for P. falciparum, 2 (1.25%) were positive for P. vivaxI, and 1 (0.62%) was positive for P. malariae. None of the samples were positive for P. ovale. Our results show that P. falciparum is still the most dominant species on the island of Grande Comore, but P. vivax and P. malariae are present at a low prevalence.

Dans l’Union des Comores, des interventions pour la lutte contre le paludisme ont contribué à une diminution spectaculaire de la prévalence de la maladie. Nous avons étudié la répartition actuelle des espèces de Plasmodium sur l’île de Grande Comore par PCR imbriquée. Les tests de diagnostic rapide (TDRs) actuellement utilisés aux Comores sont en mesure d’identifier Plasmodium falciparum, mais pas d’autres espèces de Plasmodium. Dans cette étude, nous avons testé 211 TDRs (158 positifs et 53 négatifs). Parmi les 158 TDRs positifs, 22 étaient positifs pour HRP2, 3 étaient positifs seulement pour pLDH et 133 étaient positifs pour à HRP2 et pLDH. L’ADN a été extrait d’une partie proximale de la membrane de nitrocellulose des TDRs. Au total, 159 échantillons étaient positifs par PCR nichée. Parmi eux, 156 (98,11 %) étaient positifs pour P. falciparum, 2 (1,25 %) étaient positifs pour P. vivax et 1 (0,62 %) était positif pour P. malariae. Aucun des échantillons n’était positif pour P. ovale. Nos résultats montrent que P. falciparum est toujours l’espèce dominante dans l’île de Grande Comore, mais P. vivax et P. malariae sont présents à une faible prévalence.

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