Cases in the U.S.

CDC COVID Data Tracker - Cases and Deaths by State

COVID-19 Vaccines for Moderately to Severely Immunocompromised People

CDC recommends that moderately or severely immunocompromised people receive an additional dose of mRNA COVID-19 vaccine at least four weeks after a second dose of Pfizer-BioNTech COVID-19 vaccine or Moderna COVID-19 vaccine.

Stay Up to Date with Your Vaccines

people who are up to date with their vaccines are well protected from serious illness or other health outcomes.

COVID-19 Vaccine Booster Shot

People who have had 2 shots of Pfizer-BioNTech or Moderna vaccines may need to start receiving a COVID-19 booster shot 8 months after their second dose.

Selected Adverse Events Reported after COVID-19 Vaccination

COVID-19 vaccines are safe and effective. Millions of people in the United States have received COVID-19 vaccines, and these vaccines will undergo the most intensive safety monitoring in U.S. history. CDC recommends you get a COVID-19 vaccine as soon as you are eligible. Adverse events described on this page have been reported to the Vaccine Adverse Event Reporting System (VAERS).

Staffing Resources

Federal staffing resources for health departments.

COVID-19 Travel Recommendations by Country

Search COVID-19 risk assessment by country larger map

COVID-19 Vaccines for People Vaccinated Outside the United States

Learn about CDC's recommendations for people vaccinated outside of the United States, including accepted vaccines, primary series and booster guidance, and proof of vaccination information.

Requirement for Proof of COVID-19 Vaccination for Air Passengers

Noncitizen nonimmigrants must be fully vaccinated to travel by air to the US. Some categories of noncitizen nonimmigrants are excepted from the requirement but will need to fulfill other requirements.

Archive of COVID-19 Vaccination Data Updates

CDC reports COVID-19 vaccination data online on COVID Data Tracker and in vaccination datasets.

Information About Johnson & Johnson's Janssen COVID-19 Vaccine

J&J's Janssen COVID-19 vaccine is a viral vector vaccine that requires only 1 shot. Learn about safety data, efficacy, and clinical trial demographics.

Information about the Moderna COVID-19 Vaccine

The Moderna COVID-19 vaccine is an mRNA vaccine that requires 2 shots, 28 days apart. Learn about safety data, efficacy, and clinical trial demographics.

What to Do if a Child Becomes Sick Or Receives A New COVID-19 Diagnosis At Your Child Care Program

This flowchart outlines what to do if a child becomes sick or receives a new COVID-19 diagnosis at your child care facility

COVID Data Tracker Weekly Review

A review of the week's key data from CDC's COVID Data Tracker, narrative interpretations, and visualizations.

Information about the Pfizer-BioNTech COVID-19 Vaccine

The Pfizer-BioNTech COVID-19 vaccine is an mRNA vaccine that requires 2 shots, 21 days apart. Learn about safety data, efficacy, and clinical trial demographics.

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