December 4, 2014 6:35 pm Flu Shot Less Effective Due to Virus Mutation: CDC Your flu shot may not be as effective as it should be this flu season, according to the Centers for Disease Control and Prevention. Michelle Roberts reports. US & World Videos 1:52 Off-duty nurses help save man who collapsed on East Bay basketball court 2:45 San Francisco State students join growing pro-Palestinian protest movement 2:14 Salvation Army to expand homeless housing in the South Bay 2:48 Forecast: Gradual warming trend 1:25 Bay Area high school seniors honored with Dave Goldberg Scholarship
