Just like we hear about superbacterias that build up antibiotic resistance, insecticide overuse is another major problem, and it’s allowing for selection of mosquitos that carry insecticide resistant genes. Researchers at L’Institut Pasteur in Paris observed Culex quinquefasciatus, a West Nile virus (WNV) mosquito vector to seek out an answer as to how insecticide resistance can change vector reaction with their pathogens.
When it comes to arthropod-borne viruses (aka arboviruses) such as dengue, chikungunya, Zika, and West Nile, there are no vaccines or therapy out there for them. To best avoid epidemics, controlling mosquito populations is the major intervention.
Using both insecticide resistant and insecticide susceptible Culex quinquefasciatus, and arboviruses West Nile Virus and Rift Valley Fever Virus (RVFV) researchers determined that for RVFV, vector competence remained the same whether the insect was resistant or not but for WNV, insecticide resistant mosquitoes transmitted the virus better than susceptible ones.
These results show that insecticide problems can quickly have other implications and suddenly become viral containment problems. If they do not already exist, protocols may need to be put in place in arbovirus susceptible areas.
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~Brittany Stinson
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