Indoor Spraying Prevents Dengue

Every year 300 to 500 million people are infected with dengue, where the virus is spread by Aedes aegypti mosquitos and indoor spraying helps prevent dengue.

Indoor spraying includes indoor residual spraying (IRS) and indoor space spraying (ISS), which involves spraying of insecticides inside the house shows promising results in preventing dengue, reveals a new study.

The prevention of //dengue, the most prevalent mosquito-borne virus in the world, relies heavily on controlling mosquito populations, as the currently available dengue vaccine is only partially effective. //

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‘Indoor residual spraying (IRS) and Indoor space spraying (ISS) significantly lower dengue, and further research is required on indoor spraying.’

Dengue infects between 300 and 500 million people every year, causing symptoms in around 100 million individuals and severe disease in half a million. Researchers have reported in PLOS Neglected Tropical Diseases.

The virus is primarily spread by Aedes aegypti mosquitos, which live in tropical and subtropical areas of the world.

Numerous insecticides are known to kill adult and immature Aedes mosquitos, but exposing the mosquitos to the insecticides can be challenging, since the insects tend to rest in hidden, indoor areas.

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To determine the effectiveness of indoor spraying in preventing dengue, Olaf Horstick, of the University of Heidelberg, Germany, and colleagues searched seven research databases for existing literature on indoor residual spraying (IRS) and indoor space spraying (ISS). They then systematically reviewed papers that were identified pertaining to the effect of IRS and ISS on dengue.

Out of seven studies three on IRS and four on ISS all concluded that there was some effect on either mosquito populations or dengue case numbers.

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The strength of evidence was strongest for the effect of IRS and ISS on adult mosquito populations, with multiple studies reporting no adult mosquitos surviving the indoor treatments.

Evidence on the indoor treatments to reduce larval populations or dengue cases was more limited.

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More research is needed on indoor spraying, the team concluded, although the review results are very promising, particularly in comparison with other Aedes control methods.

Source-Eurekalert