A lab technician displays Aedes aegypti mosquitoes infected with Wolbachia bacteria in a test tube for a photograph at the Oswaldo Cruz Foundation (Fiocruz) in Rio de Janeiro, Brazil, on Friday, Feb. 19, 2016. Supercharged mosquitoes could play a crucial part in fending off a large-scale global outbreak of the Zika virus as laboratories explore a method of releasing Wolbachia carrying mosquitoes back to nature. Wolbachia is a naturally occurring bacterium that researchers, funded by the Bill & Melinda Gates Foundation, have found to block transmission of dengue and may also stop other mosquito-borne viruses. Photographer: Dado Galdieri/Bloomberg via Getty Images