September 8, 2015 6:48 am CDC: ‘West Nile No Longer a Growing Problem in U.S.' While West Nile virus still occurs, the number of cases is no longer growing in the United States, according to the CDC. US & World Videos 0:55 Measles exposures in Philadelphia, Montgomery County 2:10 Delaware officials share tips for outdoor workers to stay safe out in the sun this summer 3:03 New study ranks Philly the 5th worse U.S. city when it comes to grass allergies 0:52 Philadelphia is one of the worst cities for summer allergies, report finds 4:39 You can help the Catholic Charities Appeal's mission