Galveston County Daily News, April 25, 2007 By Sally Robinson and Keith Bly GALVESTON - In last week's column, we presented information and statistics about the Human Papillomaviruses Infection. As promised, you will find some frequently asked questions that the CDC has provided on its Web site about the safety of this vaccine below: How long does vaccine protection last? Will a booster shot be needed? The length of vaccine protection (immunity) is usually not known when a vaccine is first introduced. So far, studies have followed women for five years and found that women are still protected. More research is being done to find out how long protection will last, and if a booster vaccine is needed years later.