Climate Change May Mean More Risky Mosquitoes
https://ift.tt/2CHm64o THURSDAY, March 28, 2019 (HealthDay News) -- You thought Zika was scary? Well, get this: Global warming places up to 1 billion people worldwide at risk of exposure to disease-carrying mosquitoes over the next 50 years, new research indicates. The two most common disease-transmitting mosquitoes -- Aedes aegypti and Aedes albopictus -- carry viruses such as dengue, Zika and chikungunya, plus more than a dozen others that could become larger threats in the next half-century, researchers report. By creating a month-by-month model of temperature changes across the world, scientists analyzed what would happen if these two types of mosquitoes moved as temperatures rose over the decades. "Even though it's hard to pin down the numbers, we've known this would be a problem for some time," said study author Colin Carlson. He's a postdoctoral fellow in the biology department at Georgetown University in Washington, D.C. "The scale of the numbers is definitely frightening," Carlson added. "If there's a human aspect to this, it's that we were hoping for a different result." Mosquitoes carry diseases that cause millions of deaths every year, according to the World Health Organization. Dengue, Zika and chikungunya cause symptoms that include fever, rash and severe muscle aches, among others. Zika virus surfaced in Brazil in 2014 and caused severe brain damage to thousands of South American babies exposed in the womb. Carlson and his team found that as temperatures increase worldwide, year-round transmissions of mosquito-borne diseases could occur in the tropics, and seasonal outbreaks might happen nearly everywhere else. Nearly every population on earth could be exposed to these diseases over the next half-century. In the United States, where Zika cases have occurred in warmer areas in the last several years, dengue and chikungunya could also become wider threats, Carlson said. Currently, about 100 to 200 cases of dengue fever occur in the United States every year, mostly in people who have traveled abroad, according to the U.S. National Institutes of Health. "The significance of the study is we have the ability to know the threat is coming," Carlson said. "The hope is that we can keep some of these viruses from getting established in the U.S. and U.S. territories. But any approach we take that focuses just on keeping tropical diseases out of the U.S. and Europe is missing the bigger picture." Health via WebMD Health https://www.webmd.com/ March 28, 2019 at 03:34PM
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