In this photo taken on Sept. 2, 2013, scientist Nguyen Thi Yen, center, helps her colleagues to collect mosquito pupae at Pasteur Institute in Nha Trang, Vietnam. All her mosquitoes have been intentionally infected with bacteria called Wolbachia, which essentially blocks them from getting dengue. And if they can’t get it, they can’t spread it to people. New research suggests some 390 million people are infected with the virus each year, most of them in Asia. That’s about one in every 18 people on Earth, and more than three times higher than the World Health Organization's previous estimates. (AP Photo/Na Son Nguyen)

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