| Title: | "Significant reduction in abundance of peridomestic mosquitoes (Culicidae) and Culicoides midges (Ceratopogonidae) after chemical intervention in western Sao Paulo, Brazil" |
| Author(s): | Gonzalez MA; Dilger E; Ronderos MM; Spinelli GR; Courtenay O; Hamilton JGC; |
| Address: | "Division of Biomedical and Life Sciences, Faculty of Health and Medicine, Lancaster University, Bailrigg, LA1 4YG, Lancashire, UK. Departamento de Sanidad Animal, Instituto Vasco de Investigacion y Desarrollo Agrario (NEIKER), Derio, Bizkaia, Spain. Zeeman Institute and School of Life Sciences, Gibbet Hill Campus, University of Warwick, Coventry, CV4 7AL, UK. Division Entomologia, Museo de La Plata, Paseo del Bosque s/n, 1900, La Plata, Buenos Aires, Argentina. Division of Biomedical and Life Sciences, Faculty of Health and Medicine, Lancaster University, Bailrigg, LA1 4YG, Lancashire, UK. j.g.hamilton@lancaster.ac.uk" |
| DOI: | 10.1186/s13071-020-04427-1 |
| ISSN/ISBN: | 1756-3305 (Electronic) 1756-3305 (Linking) |
| Abstract: | "BACKGROUND: We assessed the impact of two sand fly insecticide interventions (insecticide spraying and insecticide-impregnated dog collars) on the peridomestic abundance and distribution of mosquitoes (Culicidae) and biting midges (Ceratopogonidae) in western Sao Paulo (Brazil) in a long-term (42-month) evaluation. Both of these dipteran groups are vectors of diseases of medical and veterinary relevance to humans and domestic animals in Brazil. METHODS: The interventions in the 3-arm stratified randomised control trial were: pheromone + insecticide (PI) (chicken roosts were sprayed with microencapsulated lambda-cyhalothrin; pheromone lure has no effect on the Diptera pests studied here); dog-collars (DC) (dogs fitted with deltamethrin-impregnated collars); and control (C) (unexposed to pyrethroids) were extended by 12 months. During that time, adult mosquitoes and midges were sampled along 280 households at three household locations (inside human dwellings, dog sleeping sites and chicken roosts). RESULTS: We collected 3145 culicids (9 genera, 87.6% Culex spp.) distributed relatively uniformly across all 3 arms: 41.9% at chicken roosts; 37.7% inside houses; and 20.3% at dog sleeping sites. We collected 11,464 Culicoides (15 species) found mostly at chicken roosting sites (84.7%) compared with dog sleeping sites (12.9%) or houses (2.4%). Mosquitoes and Culicoides were most abundant during the hot and rainy season. Increased daytime temperature was marginally associated with increased mosquito abundance (Z = 1.97, P = 0.049) and Culicoides abundance (Z = 1.71, P = 0.087). There was no significant association with daily average rainfall for either group. Household-level mosquito and midge numbers were both significantly reduced by the PI intervention 56% [incidence rate ratio, IRR = 0.54 (95% CI: 0.30-0.97), P |
| Keywords: | "Animals;Animals Animals, Domestic Brazil Ceratopogonidae/*drug effects Culicidae/*drug effects Dogs Environment Female Humans *Insect Control Insecticides/*pharmacology Male Mosquito Vectors/*drug effects Random Allocation Seasons Abundance Chickens Culicidae Cul;" |
| Notes: | "MedlineGonzalez, Mikel A Dilger, Erin Ronderos, Maria M Spinelli, Gustavo R Courtenay, Orin Hamilton, James G C eng 080961/Z/06/Z/WT_/Wellcome Trust/United Kingdom England 2020/11/09 Parasit Vectors. 2020 Nov 7; 13(1):549. doi: 10.1186/s13071-020-04427-1" |
