Our reporter, Apoorva Mandavilli, goes inside a mosquito factory in Brazil, where scientists are producing millions of mosquitoes to fight deadly tropical diseases in a warming world.
The city of Belém in northern Brazil was overwhelmed by an outbreak of dengue two years ago. An all-out municipal effort has reduced cases and may offer lessons to American cities.
A health worker discarding water from a larvicide dissemination unit in Belém, Brazil, last month.
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