The OFF! Clip-On repellent device could be an effective tool against the Aedes aegypti mosquito - the primary vector of Zika, chikungunya, dengue, and yellow fever.

The device repels mosquitoes by releasing a vapour form of insecticide through a battery-powered fan, forming an insecticide 'cloud' around the wearer of the device.

In order to test the effectiveness of the device, Christopher Bibbs and Rui-De Xue of the Anastasia Mosquito Control District in Florida studied how the device performed against hungry Aedes aegypti mosquitoes.

The study was done outdoors in order to replicate real-world conditions. They found that the device caused high mosquito mortality and knockdown rates up to 0.3 meters from the device, enough to protect a single person wearing the device.

The World Health Organisation (WHO) has declared an emergency over the Zika virus linked to microcephaly – which causes babies to be born with abnormally small heads.

The study was published in the Journal of Medical Entomology.

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