CDC has updated its guidance for people who are fully vaccinated. See Recommendations for Fully Vaccinated People.
CDC recommends schools continue to use the current COVID-19 prevention strategies for the 2020-2021 school year. Learn more
Important update: Healthcare facilities
CDC has updated select ways to operate healthcare systems effectively in response to COVID-19 vaccination. Learn more
Getting vaccinated prevents severe illness, hospitalizations, and death. Unvaccinated people should get vaccinated and continue masking until they are fully vaccinated. With the Delta variant, this is more urgent than ever. CDC has updated guidance for fully vaccinated people based on new evidence on the Delta variant.
Given new evidence on the B.1.617.2 (Delta) variant, CDC has updated the guidance for fully vaccinated people. CDC recommends universal indoor masking for all teachers, staff, students, and visitors to K-12 schools, regardless of vaccination status. Children should return to full-time in-person learning in the fall with layered prevention strategies in place.

COVID-19 Vaccines May Make You Feel Sick

COVID-19 Vaccines May Make You Feel Sick
Updated Apr. 21, 2021

It is normal to feel sick after getting a COVID-19 vaccine.

You may have a sore arm.

Put a cool, wet cloth on your sore arm.

A cool, wet cloth may make your arm feel better.

Move and use your arm.

Moving your arm may make it feel better.


You may have the chills.

You may have a fever.

Medicine may help your fever.

Drink plenty of water.


You may feel very tired.

You may need to rest.

You should feel better in a few days.


Some COVID-19 vaccines need 2 doses.

You may feel sick after dose 1.

You may feel sick after dose 2.

Make sure you get 2 doses if needed.


Get Help if You Feel Very Sick

Call your doctor if your arm hurts more each day.

Call your doctor if you are worried about how you feel.

Get help right away if you feel very sick.

Call 9-1-1 or the emergency department if you need help.

Tell the operator that you need help.

Tell the operator that you got a COVID-19 vaccine.

Original Guidance: Possible Side Effects After Getting a COVID-19 Vaccine | CDC

Development of these materials was supported by a grant from the CDC Foundation, using funding provided by its donors. The materials were created by the Center for Literacy & Disability Studies, Department of Allied Health Sciences, University of North Carolina at Chapel Hill and the Center for Inclusive Design and Innovation at Georgia Tech. For more information about how these materials were created, refer to the Guidelines for Minimizing the Complexity of Textpdf iconexternal icon.  Centers for Disease Control and Prevention (CDC) provided subject matter expertise and approved the content. The use of the names of private entities, products, or enterprises is for identification purposes only and does not imply CDC endorsement.