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Viral Questions

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Answering your questions about the coronavirus.
Johnson & Johnson vaccine

Do I need a booster if I got the Johnson & Johnson vaccine?

Despite continued protection against severe disease, US officials are planning to offer Pfizer and Moderna boosters eight months after the second shot based on evidence that effectiveness against infection wanes over time. Adding to the decision, the vaccines don't appear quite as strong against the highly contagious delta variant as they were against earlier versions of the virus.

How are experts tracking variants of the coronavirus?

Most mutations are meaningless, but others can make a virus more contagious, deadly or resistant to vaccines and treatment. Health experts are primarily concerned about three variants first detected in the United Kingdom, South Africa and Brazil. They seem to spread more easily and research is underway to see if they cause more serious disease.