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Phlebotomine sandflies (Phlebotominae) bionomy in an outbreak area of visceral leishmaniasis in Corrientes, Argentina.
Puerto Iguazu
Simposio; 8vo. Simposio Internacional de Phlebotominae (ISOPS VIII); 2014
Institución organizadora:
Instituto Nacional de Medicina Tropical
The abundance study in time and space of Phlebotominae through the area of the City ofCorrientes (27°29′S;58°49′W) was based in human and canine cases with Visceral Leishmaniasis (VL) reported in the province and the previous records of the urban vector Lutzomyia longipalpis in the city. This preliminary study involves collection performed in three sites according to its transitional environments: periurban-rural (ENU), periurban-urban (EPU) and urban-centric (EU). In each environment three households were selected based on the ´worst scenario´ criteria. From March to December 2013 the captures were made fortnightly during three consecutive days using CDC type-light trap in each peridomiciliary habitat, from 17:00hs to 8:00hs. In total 449 Phlebotominae were captured: Lu. longipalpis (51.2%), Nyssomyia neivai (43.7%), Migonemyia migonei (2.2%), Micropygomia quinquefer (2.0%) and Evandromyia females from Cortelezzii complex (0.9%). The sandfly maximal abundance was in March (32.7%) with an average temperature of 22ºC, and minimum abundance during August (0.2%) with temperatures of approximately 14,3ºC. Lu. longipalpis was recorded in all the seasons with the highest abundance in March and April (n=119) during autumn, and the lowest abundance (n=27) in winter, with a progressive increase of the abundance in the captures from September, at the beginning of the spring. The main abundance of Ny. neivai was also in autumn, but its captures increased since October. Although Lu. longipalpis was recorded in the three environments, was more abundant in EPU and EU, while Ny. neivai was more abundant in ENU. Mi. migonei was recorded in autumn and spring in ENU and EPU but due to the low number collected may be considered as an occasional specie. The consistent presence of Lu. longipalpis in time and space in the urban area and the occasional captures of Mi. migonei, main and putative vectors of Leishmania infantum respectively, besides the reports of autochthonous cases of human and canine VL, suggests a risk of transmission along the year. However, this risk is highly heterogeneous in time and space, lower in winter despite of the fact that the actual incidence of cases could increase early in this season due to the abundance vectors peaked in autumn and the parasite intrinsic incubation time. Financial support: Proyecto (F008/09) Res. Nº 1080/09. Periodo 2010-2013. UNNE. PICTO-ANLIS 2011.