Harvard Women's Health Watch

4 vaccinations you may need

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Keeping one step ahead of the flu is only part of the challenge. It's important to stay up to date with all recommended immunizations.

As you've witnessed, the world is changing fast these days. So are the bacteria and viruses that inhabit the world around us. As new strains develop and spread to different regions, scientists are constantly working to come up with ways to better protect us against them. "New vaccines are developed, existing vaccines are revised, and reasons to give older vaccines change," says Dr. Laura Riley, associate professor of obstetrics, gynecology, and reproductive medicine at Harvard Medical School. She adds that the possibility of new outbreaks, such as H1N1 influenza or a measles epidemic, also need to be considered.

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