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Vaccines are safe, well-tested and effective in preventing some serious diseases like measles, pertussis (whooping cough) and polio. But, like any medicines, vaccines can have side effects. It’s understandable that people have questions about vaccine safety and effectiveness, especially with the coverage of these subjects by the media. We want to help answer your questions with accurate and reliable information. Not everything you see, hear or read about vaccines in the media or on the Internet is accurate. So, in addition to looking around our website, please visit these other sites for information you can trust: