Rio is rife with dengue fever. But mosquitoes bred with a bacteria are making a difference.

I don't understand AP's old-school headline fetish that makes no sense in the digital world. There's no need to be confusing to save space. It's not as if my clearer headline that's ~10 characters longer than theirs is "too long".

The dengue virus is passed between humans by infected mosquitoes, but a type of bacteria called Wolbachia can interrupt transmission of the disease. Health officials say a pilot program launched in Niteroi in 2015, in which scientists breed mosquitoes to carry the Wolbachia bacteria, has helped the city in its battle against dengue.