Ebola virus, hantavirus and the pathogen that causes Covid-19 likely jumped from animals to humans. So do these viruses — and scientists say climate change is speeding their spread.
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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