Spatial variations 2011-2015 of Lutzomyia longipalpis and Nyssomyia whitmani the Leishmania spp. vector in northeastern Argentina

SANTINI MS; QUINTANA MG; CAVIA R; UTGÉS ME; SALOMÓN OD

Toledo

Congreso; 6th World Congress on Leishmaniasis; 2017

1 BackgroundLutzomyia longipalpis has been reported in urban environments of Puerto Iguazú, Argentina since 2010, andNyssomyia whitmani has been reported in the rural area since 1990, but in urban sites since 2011. Weanalyzed the variations in the spatial distribution of their abundance within the city of Puerto Iguazú in theyears 2011 and 2015.2 MethodsIn December 2011 and November-December 2015 sandflies were sampled in 52 and 55 householdsrespectively covering the whole urban area of Puerto Iguazú, for two or three consecutive nights with REDILAlight traps. Traps were set according to the ?worst peridomestic scenario? criterium. Spatial autocorrelation ofabundance of each vector was studied using isotropic and anisotropic semivariograms. When autocorrelationwas detected, abundance was interpolated using ordinary kriging according to semivariogram?s parameters.Interpolated values of abundances for both periods were compared using QGis.3 ResultsThe spatial distribution of each vector during 2011 remained similar in 2015 captures; Lu. longipalpisconcentrated in more urbanized areas at the northwest of the city, and Ny. whitman in the center andsoutheast. Lu. longipalpis and Ny. whitman abundances resulted autocorrelated in both periods up to adistance of 700-1000 and 450 meters respectively.4 ConclusionsThe spatial analysis showed that the two studied species kept the 2010 distribution in 2015, Lu. longiplapis76.4% and Ny whitmani 67.2%. Lu. longipalpis, is concentrated in the more urban anthropized area close to themain rivers, while Ny. whitmani, was closer to the southeast patches of forest, watherver is close to waterbodies(2011 captures). This results will allow to focus intervention in risk areas and to reduce vector-humancontact.