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What are vaccines?

Vaccines play an important role in keeping us healthy. They protect us from serious and sometimes deadly diseases. Vaccines are injections (shots), liquids, pills, or nasal sprays that you take to teach your body's immune system to recognize and defend against harmful germs. The germs could be viruses or bacteria.

Most vaccines contain germs (or parts of germs) that cause disease. The germs have been killed or weakened enough that they won't make you sick. But they will spark an immune response, which helps your body fight off the germs. Your immune system will also remember the germ and attack it if that germ ever invades again. This protection against a certain disease is called immunity.

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Results 1 - 10 of 1,193 for vaccine safety
  1. Vaccine Safety (National Library of Medicine)  
    ... company who makes the vaccine to evaluate the vaccine's safety and effectiveness. If the vaccine is found to ...
  2. Frequently Asked Questions about HPV Vaccine Safety (Centers for Disease Control and Prevention)  
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  3. Ensuring COVID-19 Vaccine Safety in the US (Centers for Disease Control and Prevention)  
    ... for COVID-19 vaccines. Learn how the U.S. vaccine safety system is ensuring the safety of COVID-19 ... coronavirus, COVID-19, covid, vaccine, vaccination, vaccine safety, clinical ... reaction, Coronavirus [CoV], Vaccines, Prevention & Infection Control
  4. Flu Vaccine Safety and Pregnancy (Centers for Disease Control and Prevention)  
    Seasonal Flu Vaccine Safety and Pregnant Women - CDC ... seasonal flu vaccine safety, pregnant women, unborn babies, flu shot, breastfeeding mother, side effects, Influenza Vaccination, Influenza (Flu), Seasonal Flu
  5. Vaccine Safety for Moms-to-Be (Centers for Disease Control and Prevention)  
    Tdap vaccine pregnancy safety, whooping cough vaccine pregnancy safety, flu vaccine pregnancy safety, how safe are vaccines during pregnancy, which vaccines ...
  6. Vaccine Safety (Centers for Disease Control and Prevention)  
    Get the latest vaccine safety guidance from CDC, including safety information for recommended vaccines, safety studies, and consultation for health professionals.
  7. Common Vaccine Safety Questions and Concerns (Centers for Disease Control and Prevention)  
    Vaccine Safety
  8. Vaccine Safety (Department of Health and Human Services)  
    ... In this section, you’ll learn more about vaccine safety — and get answers to common questions about vaccine ...
  9. Flu Vaccine Safety Information (Centers for Disease Control and Prevention)  
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  10. Vaccine Safety FAQs for Parents and Caregivers (Centers for Disease Control and Prevention)  
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