The US approved the release of billions of genetically modified mosquitoes to reduce the transmission of diseases but critics point to possible unintended consequences.
Project involving more than 39,000 households in Tanzania shows nets, treated with chlorfenapyr as well as pyrethroid, lead to a remarkable decline in malaria prevalence.
Hospitals in Sri Lanka are overwhelmed as the government struggles to control the virus which can develop into a deadly hemorrhagic fever.
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