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Current Affairs

Environmentally sustainable method to block Dengue virus transmisssion

Date: 25 November 2019 Tags: Miscellaneous

Issue

An effective yet environmentally sustainable method has proved useful in blocking the transmission of mosquito-borne dengue virus.

 

Background

The intervention succeeded despite ongoing pesticide applications and other challenges that can make it hard for the Wolbachia to become established.

 

Details

  • Using a strain of the bacteria Wolbachia, which inhibit mosquitoes from transmitting viruses to humans, researchers were able to successfully reduce cases of dengue.

  • Their data shows that mosquitoes carrying the wAlbB strain of Wolbachia, when released into the wild, had the effect of reducing the incidence of dengue cases by 40 percent.

  • This team of researchers has shown that the wAlbB strain of Wolbachia is stable and effective, even in daily peak temperatures of 36° Celsius and higher.

  • Researchers released batches of Aedes aegypti mosquitoes carrying the wAlbB strain of Wolbachia into the wild, in six different sites with high levels of dengue transmission.

  • The Wolbachia carrying mosquitoes ,both male and female then went on to mate with the wild mosquito population, resulting in the spread and establishment of the virus-inhibiting bacteria.

  • In some sites, Wolbachia-carrying mosquitoes were measured at over 90 percent frequency more than a year after the mosquito releases ended.

 

Dengue

Dengue fever is a mosquito-borne tropical disease caused by the dengue virus. Symptoms  may include a high fever, headache, vomiting, muscle and joint pains, and a characteristic skin rash.