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In this Wednesday, Sept. 24, 2014, file photo, a technician releases mosquitoes that are infected with a dengue-blocking bacteria called "Wolbachia" in the Tubiacanga neighborhood of Rio de Janeiro, Brazil. The nonprofit World Mosquito Program infected mosquitoes with that bacteria, called Wolbachia, and released them in communities in Indonesia, Vietnam, Brazil and Australia that agreed to be test sites. Researchers say dengue cases fell dramatically, compared to nearby communities where regular mosquitoes did the biting. (AP Photo/Silvia Izquierdo, File)

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They still bite, but new research shows lab-grown mosquitoes are fighting dangerous dengue fever that they normally would spread.

By LAURAN NEERGAARD, Associated Press November 21, 2019