A biologist puts her hand in a box with male genetically modified Aedes aegypti mosquitoes at an educational exhibition by British biotechnology company Oxitec in Piracicaba March 5, 2015. Oxitec said its laboratory created the genetically modified male Aedes aegypti mosquitoes, which are set to be released in Sao Paulo in April. A specially-made gene in the male mosquitoes seeks to reduce to number of Aedes aegypti mosquitoes by killing their offspring after mating with wild female mosquitoes. Brazil already has more than 100 000 cases of people with dengue in 2015, according to the City Department of Health. REUTERS/Paulo Whitaker (BRAZIL - Tags: SOCIETY CRIME LAW)