What's the best way to protect yourself against influenza? Get vaccinated. "Vaccination is the single most effective way to protect yourself, your family and your community against influenza," said Dr. Thomas R. Frieden, director of the CDC. Americans seem to be listening. An estimated 43 percent received the vaccine last season, according to new data from the agency. But some states are a lot less keen on the vaccine than others. Keep clicking to see 15 with the lowest immunization rates last season (August 2010 to May 2011)...