The effect of irrigation on malaria vector bionomics and transmission intensity in western Ethiopia
| Autor: | Daibin Zhong, Behailu Taye, Guofa Zhou, James W. Kazura, Werissaw Haileselassie, Ming-Chieh Lee, Endalew Zemene, Delenasaw Yewhalaw, Alemayehu Dagne, Wakgari Deressa, Guiyun Yan |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Veterinary medicine
and promotion of well-being Agricultural Irrigation Anopheles gambiae Mycology & Parasitology Infectious and parasitic diseases RC109-216 2.2 Factors relating to the physical environment Transmission intensity Aetiology Ecology Circumsporozoite protein Infectious Diseases Sporozoites Medical Microbiology Public Health and Health Services Female Infection Irrigation medicine.medical_specialty Plasmodium falciparum Mosquito Vectors Biology Rare Diseases Bionomics Tropical Medicine Anopheles parasitic diseases medicine Animals Humans Population Density 3.2 Interventions to alter physical and biological environmental risks Mosquito vectors Research Prevention Oryza Feeding Behavior medicine.disease biology.organism_classification Prevention of disease and conditions Malaria Vector-Borne Diseases Cross-Sectional Studies Good Health and Well Being Parasitology Tropical medicine Ethiopia |
| Zdroj: | Parasites & Vectors, Vol 14, Iss 1, Pp 1-11 (2021) Parasites & vectors, vol 14, iss 1 Parasites & Vectors |
| ISSN: | 1756-3305 |
| Popis: | Background Irrigation schemes may result in subsequent changes in malaria disease dynamics. Understanding the mechanisms and effects of irrigation on malaria vector bionomics and transmission intensity is essential to develop new or alternative surveillance and control strategies to reduce or control malaria risk. This study was designed to assess the effect of rice irrigation on malaria vector bionomics and transmission intensity in the Gambella Region, Ethiopia. Methods Comparative cross-sectional study was conducted in Abobo District of the Gambella Region, Ethiopia. Accordingly, clusters (kebeles) were classified into nearby and faraway clusters depending on their proximity to the irrigation scheme. Adult mosquito survey was conducted in February, August and November 2018 from three nearby and three faraway clusters using Centers for Disease Control and Prevention (CDC) light traps (LTs). During the November survey, human landing catch (HLC) and pyrethrum spray catch (PSC) were also conducted. The collected mosquitoes were morphologically identified to species and tested for Plasmodium infection using circumsporozoite protein enzyme-linked immunosorbent assay (CSP-ELISA). Furthermore, species-specific polymerase chain reaction (PCR) was performed to identify member species of the Anopheles gambiae complex. Chi-square and t-tests were used to analyze the data using the SPSS version 20 software package. Results A total of 4319 female anopheline mosquitoes comprising An. gambiae sensu lato, An. funestus group, An. pharoensis, An. coustani complex and An. squamosus were collected. Overall, 84.5% and 15.5% of the anopheline mosquitoes were collected from the nearby and faraway clusters, respectively. Anopheles gambiae s.l. was the predominant (56.2%) anopheline species in the area followed by An. pharoensis (15.7%). The density of anopheline mosquitoes was significantly higher in the nearby clusters in both HLCs [t(3) = 5.14, P = 0.0143] and CDC LT catches [t(271.97) = 7.446, P Conclusions Significantly higher mosquito population density was observed in areas close to the irrigation sites. Sporozoite infection rate in the mosquito population was also markedly higher from the nearby clusters. Therefore, the irrigation scheme could increase the risk of malaria in the area. Graphical abstract |
| Databáze: | OpenAIRE |
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