Growing risk of dengue fever as virus spreads

Health authorities say Americans face a growing risk of dengue fever from mosquitos that are common in the United States. The concern comes as cases of dengue have increased dramatically in Central and South America. NBC News's Anne Thompson reports. NBC News Digital is a collection of innovative and powerful news brands that deliver compelling, diverse and engaging news stories. NBC News Digital features NBCNews.com, MSNBC.com, TODAY.com, Nightly News, Meet the Press, Dateline, and the existing apps and digital extensions of these respective properties. We deliver the best in breaking news, live video coverage, original journalism and segments from your favorite NBC News Shows.