New Information: What We Know about Omicron and Other COVID-19 Variants

Microbiologist Esther Babady in her lab

Esther Babady is Director of MSK’s Clinical Microbiology Service.

There are many questions about the Omicron variant of COVID-19, and scientists are continuing to learn more every day.

Esther Babady, Director of MSK’s Clinical Microbiology Service, is a nationally recognized leader in understanding variants and testing for the virus that causes COVID-19.

Here, Dr. Babady answers questions you may have now about Omicron and how to protect yourself.

What is the Omicron variant of COVID-19?

The Omicron variant is a strain of COVID-19 that was first identified in South Africa. When scientists find variants, it means the virus is changing as it moves from person to person throughout the population. It is completely normal and expected.

Back to top

Is the Omicron variant more contagious? Does it cause more severe disease?

The Omicron variant is very contagious but does not appear to cause more severe disease. Scientists are doing a lot of work to understand how current vaccines and treatments work against Omicron. There is much to be learned.

Back to top

Should I be worried about the Omicron variant?

The Omicron variant of COVID-19 is labeled by the Centers for Disease Control and Prevention (CDC) and World Health Organization (WHO) as a “variant of concern.” The CDC says a variant of concern could have several possible attributes, including any or all of the following:

  • increased transmissibility
  • increased disease severity
  • decreased vaccine protection

Delta, which spread widely in the US in the summer of 2021, is another variant of concern. It’s important to understand that the vaccines continued to offer strong protection against Delta. Read more about how the CDC defines a variant of concern »

Back to top

Will the current vaccines protect against the Omicron variant?

Manufacturers of all three vaccines are currently testing to see how well they work against the Omicron variant, and they are preparing to reformulate them if necessary.

Experts in the scientific community believe that current vaccines will provide at least some protection from severe illness caused by the Omicron variant. The beauty of the mRNA vaccines (made by Moderna and Pfizer-BioNTech) is that they can be quickly adjusted and improved. If we find out the current vaccines don’t provide adequate immunity from the Omicron variant, a new and improved vaccine could be made in a couple of months.

Back to top

What can I do now to protect myself from Omicron and other variants?

The most important thing you can do is get vaccinated against COVID-19 and get your booster shot. Getting your initial vaccination and following up with a booster shot can protect against severe illness and can stop the virus from spreading easily. Read more about who can get a booster shot and when »

In addition to being vaccinated, you should wear a mask in some situations, stay home when you are sick, and wash your hands frequently. We know that these actions slow the spread of COVID-19, as well as other sicknesses like the cold and flu.

January 7, 2021

Additional Resources

Back to top