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Vaccine Safety

This website is archived for historical purposes and is no longer being maintained or updated. For updated information on the current flu season, see the CDC Seasonal Flu website.

January 4, 2010, 9:30 AM ET

The 2009 H1N1 influenza vaccines are showing similar safety profiles as seasonal flu vaccines, which have very good safety track records. Over the years, hundreds of millions of Americans have received seasonal flu vaccines. Millions of people have also safely received the 2009 H1N1 vaccine. The most common side effects following flu vaccinations are mild, such as soreness, redness, tenderness or swelling where the shot was given. The Centers for Disease Control and Prevention (CDC) and the Food and Drug Administration (FDA) are closely monitoring for any signs that the vaccine is causing unexpected adverse events and are working with state and local health officials to investigate any unusual events.

Vaccine Monitoring

 
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