At 7 A.M. on a midsummer day in Piracicaba, a city in the Brazilian state of São Paulo, Cecilia Kosmann sat in the back of a van surrounded by plastic take-out containers filled with genetically modified male Aedes aegypti mosquitoes. Every two minutes or so, she shook a container through a plastic funnel, releasing them into the cool outside air.
By the time the van finished its daily route through two neighborhoods here, she’d released about 250,000 of them.
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