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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.

Some types of vaccines contain germs that cause disease. But the germs have been killed or weakened enough that they won't make you sick. Some vaccines only contain a part of a germ. Other types of vaccines include instructions for your cells to make a protein of the germ.

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Results 1 - 10 of 1,331 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. 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.
  3. Frequently Asked Questions about HPV Vaccine Safety (Centers for Disease Control and Prevention)  
    human papillomavirus vaccine safety, hpv vaccine safety, hpv vaccine, hpv vaccine side effects, frequently asked questions, gardasil, gardasil vaccine, gardasil side effects, ...
  4. Flu Vaccine Safety and Pregnancy (Centers for Disease Control and Prevention)  
    Seasonal Flu Vaccine Safety and Pregnant Women - CDC
  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, COVID-19 ...
  6. Common Vaccine Safety Questions and Concerns (Centers for Disease Control and Prevention)  
    Vaccine Safety
  7. Measles, Mumps, Rubella (MMR) Vaccine Safety Information (Centers for Disease Control and Prevention)  
    The latest safety information from CDC on MMR vaccine: safety studies, common side effects, vaccine schedules, vaccine package ... vaccine, measles and rubella, mmr vaccine research, cdc, Vaccine Safety
  8. Flu Vaccine Safety Information (Centers for Disease Control and Prevention)  
    Flu Vaccine Safety Information: Questions and Answers -- CDC
  9. Vaccine Safety FAQs for Parents and Caregivers (Centers for Disease Control and Prevention)  
    ... safe, children, faqs, side effects, parents, caregivers, resources, Vaccine Safety
  10. 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 ...
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