Monday, January 25, 2021

Understanding mRNA COVID-19 Vaccines

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Coronavirus Disease 2019 (COVID-19)
January 25, 2021
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 man wearing mask walking through an airport

New COVID-19 Testing Requirements for All Air Passengers Arriving in the United States

If you plan to travel internationally, you will need to get tested no more than 3 days before you travel by air into the United States. You will need to show your negative result to the airline before you board your flight, or be prepared to show documentation of recovery. This can be proof of a recent positive viral test and a letter from your healthcare provider or a public health official stating that you were cleared to travel.

image of bottles of vaccine and needle with text COVID-19 Coronavirus

Understanding mRNA COVID-19 Vaccines

Messenger RNA vaccines—also called mRNA vaccines—are some of the first COVID-19 vaccines authorized for use in the United States. COVID-19 mRNA vaccines give instructions for cells to make a harmless piece of the so-called "spike protein”, which the virus uses to enter cells in the body. After the protein piece is made, the cell breaks down the instructions and gets rid of them. The immune system recognizes that the protein doesn’t belong there and begins making antibodies to protect against future infection. People who get vaccinated gain this protection without having to risk the serious consequences of getting sick with COVID-19. 


Coronavirus Disease 2019 (COVID-19) in the U.S.

January 25, 2021

In the United States, there have been 25,018,520 confirmed cases of COVID-19 detected through U.S. public health surveillance systems in 50 states and the District of Columbia, Puerto Rico, Guam, the Northern Marianas Islands, and U.S. Virgin Islands.


CDC provides updated U.S. case information online daily.


In addition to cases, deaths, and laboratory testing, CDC’s COVID Data Tracker now has a Vaccinations tab to track distribution of COVID-19 vaccines in your state.

This map shows COVID-19 cases reported by U.S. states, the District of Columbia, New York City, and other U.S.-affiliated jurisdictions

Centers for Disease Control and Prevention

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COVID-19 Vaccine Recommendation for Older Adults, International Long COVID Awareness Day, and More

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