Frequently Asked Questions about COVID-19 Vaccination : CDC

Source : CDC


If I already had COVID- 19 and recovered, do I still need to get a COVID-19 vaccine?


Yes, you should be vaccinated regardless of whether you already had COVID-19. That’s because experts do not yet know how long you are protected from getting sick again after recovering from COVID-19. Even if you have already recovered from COVID-19, it is possible—although rare—that you could be infected with the virus that causes COVID-19 again. Studies have shown that vaccination provides a strong boost in protection in people who have recovered from COVID-19. Learn more about why getting vaccinated is a safer way to build protection than getting infected.

If you were treated for COVID-19 with monoclonal antibodies or convalescent plasma, you should wait 90 days before getting a COVID-19 vaccine. Talk to your doctor if you are unsure what treatments you received or if you have more questions about getting a COVID-19 vaccine.

If you or your child has a history of multisystem inflammatory syndrome in adults or children (MIS-A or MIS-C), consider delaying vaccination until you or your child have recovered from being sick and for 90 days after the date of diagnosis of MIS-A or MIS-C. Learn more about the clinical considerations people with a history of multisystem MIS-C or MIS-A.

Experts are still learning more about how long vaccines protect against COVID-19. CDC will keep the public informed as new evidence becomes available.

Related pages:

  • Benefits of Getting Vaccinated

  • Preparing for Your COVID-19 Vaccination

Is it safe for my child to get a COVID-19 vaccine?


Yes. Studies show that COVID-19 vaccines are safe and effective. Like adults, children may have some side effects after COVID-19 vaccination. These side effects may affect their ability to do daily activities, but they should go away in a few days. Children 12 years and older are now eligible to get vaccinated against COVID-19. COVID-19 vaccines have been used under the most intensive safety monitoring in U.S. history, including studies in children 12 years and older. Your child cannot get COVID-19 from any COVID-19 vaccine.


Why should my child get vaccinated for COVID-19?


COVID-19 vaccination can help protect your child from getting COVID-19. Although fewer children have been sick with COVID-19 compared to adults, children can be infected with the virus that causes COVID-19, can get sick from COVID-19, and can spread the virus that causes COVID-19 to others. Getting your child vaccinated helps to protect your child and your family. Vaccination is now recommended for everyone 12 years and older. Currently, the Pfizer-BioNTech COVID-19 Vaccine is the only one available to children 12 years and older.

Related page:

  • COVID-19 Vaccines for Children and Teens

What are the ingredients in COVID-19 vaccines?

Vaccine ingredients can vary by manufacturer. To learn more about the ingredients in authorized COVID-19 vaccines, see

  • Information about the Pfizer-BioNTech COVID-19 Vaccine

  • Information about the Moderna COVID-19 Vaccine

  • Information about the Johnson & Johnson’s Janssen COVID-19 Vaccine

  • Ingredients Included in COVID-19 Vaccines

Do I need to wear a mask and avoid close contact with others when I am fully vaccinated?


No. Fully vaccinated people can resume activities without wearing a mask or physically distancing, except where required by federal, state, local, tribal, or territorial laws, rules, and regulations, including local business and workplace guidance. If you are fully vaccinated, you can resume activities that you did before the pandemic.

Additional recommendations can be found at When You’ve Been Fully Vaccinated.

Related pages:

  • When You’ve Been Fully Vaccinated

  • Key Things to Know

  • Protect Yourself and Others

How long does protection from a COVID-19 vaccine last?


We don’t know how long protection lasts for those who are vaccinated. What we do know is that COVID-19 has caused very serious illness and death for a lot of people. If you get COVID-19, you also risk giving it to loved ones who may get very sick. Getting a COVID-19 vaccine is a safer choice.

Experts are working to learn more about both natural immunity and vaccine-induced immunity. CDC will keep the public informed as new evidence becomes available.

Related page:

  • Vaccines Work

If I have an underlying condition, can I get a COVID-19 vaccine?


People with underlying medical conditions can receive a COVID-19 vaccine as long as they have not had an immediate or severe allergic reaction to a COVID-19 vaccine or to any of the ingredients in the vaccine. Learn more about vaccination considerations for people with underlying medical conditions. Vaccination is an important consideration for adults of any age with certain underlying medical conditions because they are at increased risk for severe illness from COVID-19.

Related pages:

  • Underlying Medical Conditions

  • People at High Risk

  • People with Allergies