Outbreak of autochthonous cases of malaria in coastal regions of Northeast Brazil: the diversity and spatial distributio
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Parasites & Vectors Open Access
RESEARCH
Outbreak of autochthonous cases of malaria in coastal regions of Northeast Brazil: the diversity and spatial distribution of species of Anopheles Elainne Christine de Souza Gomes1* , Derciliano Lopes da Cruz2, Maria Alice Varjal Melo Santos2, Renata Maria Costa Souza3, Cláudia Maria Fontes de Oliveira2, Constância Flávia Junqueira Ayres2, Renata Martins Domingos4, Maria das Graça da Silva Pedro4, Marcelo Henrique Santos Paiva2,5 and Lílian Maria Lapa Montenegro Pimentel3
Abstract Background: Brazil has the fourth highest prevalence of malaria of all countries in the Americas, with an estimated 42 million people at risk of contracting this disease. Although most cases occur in the Amazon region, cases of an autochthonous nature have also been registered in the extra-Amazonian region where Anopheles aquasalis and An. albitarsis are the mosquito species of greatest epidemiological interest. In 2019, the municipality of Conde (state of Paraíba) experienced an epidemic of autochthonous cases of malaria. Here we present preliminary results of an entomological and case epidemiology investigation, in an attempt to correlate the diversity and spatial distribution of species of Anopheles with the autochthonous cases of this outbreak of malaria. Methods: Case data were collected using case report forms made available by the Conde Municipal Health Department. The entomological survey was carried out from July to November 2019. The various methods of capture included the use of battery-powered aspirators, mouth aspirators, Shannon traps, BG-Sentinel traps (with and without dry ice) and CDC light traps. Captured mosquitoes were separated, packaged and sent to the laboratory for sexing and molecular identification of the various species of anophelines. The data were tabulated and analyzed using Microsoft Excel. Spatial analysis of the data was performed using ArcGis 10 software. Results: In 2019, 20 autochthonous cases and one imported case of malaria caused by Plasmodium vivax were diagnosed, with three cases of relapses. A total of 3713 mosquitoes were collected, of which 3390 were culicines and 323 were anophelines. Nine species of genus Anopheles were identified, with the most abundant being An. aquasalis (38.9%), followed by An. minor (18.2%) and An. albitarsis (9.0%). Spatial analysis of the data showed that the area could be considered to be at risk of malaria cases and that there was a high prevalence of Anopheles. Conclusions: The results presented indicate that this extra-Amazonian region has an environment conducive to maintenance of the malaria transmission cycle owing to the wide diversity of Anopheles species. This environment in
*Correspondence: [email protected] 1 Department of Parasitology, Aggeu Magalhães Institute, Fiocruz, Ministry of Health, Brazil, Av. Professor Moraes Rego, s/n Cidade Universitária, Recife, PE 50740‑465, Brazil Full list of author information is available at the end of the article © The Author(s) 2020. This article is licensed un
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