In this Jan. 18, 2016 file photo, a researcher holds a container with female Aedes aegypti mosquitoes at the Biomedical Sciences Institute in the Sao Paulo's University in Sao Paulo, Brazil. The spread of the Zika virus in Latin America is giving a boost to a British biotech firm's proposal to try reducing the threat by deploying a genetically modified version of the mosquito that transmits the disease.