Evaluation of a novel West Nile virus transmission control strategy that targets Culex tarsalis with endectocide-containing blood meals.
PLoS Negl Trop Dis
; 13(3): e0007210, 2019 03.
Article
em En
| MEDLINE
| ID: mdl-30845250
ABSTRACT
Control of arbovirus transmission remains focused on vector control through application of insecticides directly to the environment. However, these insecticide applications are often reactive interventions that can be poorly-targeted, inadequate for localized control during outbreaks, and opposed due to environmental and toxicity concerns. In this study, we developed endectocide-treated feed as a systemic endectocide for birds to target blood feeding Culex tarsalis, the primary West Nile virus (WNV) bridge vector in the western United States, and conducted preliminary tests on the effects of deploying this feed in the field. In lab tests, ivermectin (IVM) was the most effective endectocide tested against Cx. tarsalis and WNV-infection did not influence mosquito mortality from IVM. Chickens and wild Eurasian collared doves exhibited no signs of toxicity when fed solely on bird feed treated with concentrations up to 200 mg IVM/kg of diet, and significantly more Cx. tarsalis that blood fed on these birds died (greater than 80% mortality) compared to controls (less than 25% mortality). Mosquito mortality following blood feeding correlated with IVM serum concentrations at the time of blood feeding, which dropped rapidly after the withdrawal of treated feed. Preliminary field testing over one WNV season in Fort Collins, Colorado demonstrated that nearly all birds captured around treated bird feeders had detectable levels of IVM in their blood. However, entomological data showed that WNV transmission was non-significantly reduced around treated bird feeders. With further development, deployment of ivermectin-treated bird feed might be an effective, localized WNV transmission control tool.
Texto completo:
1
Coleções:
01-internacional
Contexto em Saúde:
1_ASSA2030
/
2_ODS3
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4_TD
Base de dados:
MEDLINE
Assunto principal:
Doenças das Aves Domésticas
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Febre do Nilo Ocidental
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Vírus do Nilo Ocidental
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Controle de Doenças Transmissíveis
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Culex
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Mosquitos Vetores
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Inseticidas
Tipo de estudo:
Evaluation_studies
Aspecto:
Determinantes_sociais_saude
Limite:
Animals
País/Região como assunto:
America do norte
Idioma:
En
Revista:
PLoS Negl Trop Dis
Ano de publicação:
2019
Tipo de documento:
Article