Evaluation of a species-specific PCR assay for the Anopheles funestus group from eleven African countries and Madagascar

Abstract

A newly published cocktail polymerase chain reaction (PCR) assay can identify five members of the Anopheles funestus group: An. funestus, An. vaneedeni, An. parensis, An. leesoni and An. rivulorum. The assay was evaluated on specimens from 11 African countries: Angola, Cote d’Ivoire, Ethiopia, Kenya, Malawi, Mozambique, Namibia, South Africa, Tanzania, Uganda and Zambia; and the island of Madagascar. The polymerase chain reaction single strand conformation polymorphism (PCR-SSCP) and the internal transcribed spacer PCR (ITS2-PCR) assays were used as a priori identification methods on 900 specimens. Of these, 96.4% were correctly identified using the new cocktail PCR method. The remaining 3.5% (32) from Malawi failed to amplify. The failure to identify these samples was not significantly different from the samples from the other countries (Chi-square; P>0.05). The results suggest that the new species-specific PCR assay is an efficient and effective means of identifying 5 members of the An. funestus group in a single reaction. It is also less time-consuming than the molecular methods previously used on the group.