Nature Outbreaks of dengue are killing thousands of people in South America each year and getting worse. Brazil hopes to turn the tide with a home-grown vaccine and an army of mosquitoes infected with Wolbachia bacteria. Last month, a parade of vehicles wound its way through three cities in Brazil, releasing clouds of mosquitoes into the air. The insects all carry a secret weapon — a bacterium called Wolbachia that lowers the odds that the mosquitoes can transmit the dreaded dengue virus to humans.
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