Monday, January 9, 2023

Two Years of COVID-19 Vaccination

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CDC Centers for Disease Control and Prevention CDC 24/7: Saving Lives, Protecting People
Coronavirus Disease 2019 (COVID-19)
January 9, 2023
This message includes updates on the COVID-19 response from CDC. The COVID-19 Outbreak is a rapidly evolving situation and information will be updated as it becomes available.
Illustration of a snowman with a bandaid with a heart

Two Years of COVID-19 Vaccination

December 2022 marked two years since the first COVID-19 vaccine was administered in the U.S. Although too many lives have been lost to COVID-19 since the start of the pandemic, vaccination has helped prevent millions of hospitalizations and saved millions of lives.

Stay up to date on your vaccines to protect yourselves, your loved ones, and your community against COVID-19. As with other vaccine-preventable diseases, you are protected best from COVID-19 when you stay up to date with the recommended vaccinations, including recommended boosters.

Get an updated bivalent booster at least 2 months after completing your primary series or last booster. If you’ve had COVID-19, you may delay getting your booster by 3 months since your symptoms ended.

Illustration of sick woman smiling with a band aid on her arm

Flu Vaccine and COVD-19 Boosters

Studies conducted throughout the COVID-19 pandemic indicate that it is safe to get both a flu vaccine and a COVID-19 vaccine at the same visit.

A CDC study published last summer showed people who got a flu vaccine and a COVID-19 booster vaccine at the same time were slightly more likely to have reactions including fatigue, headache, and muscle ache than people who only got a COVID-19 booster vaccine, but these reactions were mostly mild and went away quickly. The findings of this study are similar to safety data from clinical trials that did not find any safety concerns with giving both vaccines at the same time.

To find COVID-19 vaccine locations near you, visit, text your ZIP code to 438829, or call 1-800-232-0233.

Illustration of a bottle of covid-19 vaccine

Ensuring COVID-19 Vaccine Safety

To make sure that COVID-19 vaccines are safe, CDC expanded and strengthened the country’s ability to monitor vaccine safety. CDC created new web-based platforms to gather information and give CDC scientists information about the safety of COVID-19 vaccines in real time.

As a result, vaccine safety experts can monitor and detect issues that may not have been seen during the COVID-19 vaccine clinical trials. If any vaccine safety issues—also called adverse events— are reported, CDC scientists can quickly study them and determine if there is a safety concern with a particular vaccine.

Illustration of a graph of covid cases

COVID Data Tracker Weekly Review

The most recent Omicron sublineage, XBB.1.5, is on the rise across the United States. Projections can be uncertain when a variant is just beginning to spread, and CDC is continuing to investigate the ways in which XBB.1.5 may be different from other Omicron lineages.

This week’s COVID Data Tracker Weekly Review explains weighted estimates and Nowcast estimates, the two methods CDC uses to display variant proportions.

COVID-19 Community Levels

CDC uses COVID-19 Community Levels to determine the disease’s impact on counties and recommend prevention measures.

CDC also tracks cases, laboratory tests, vaccinations, deaths, and other pandemic data and provides them on our COVID Data Tracker.

U.S. map showing COVID-19 Community Levels

Centers for Disease Control and Prevention

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