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City of Dublin

Posted on: October 22, 2021

CDC Recommends COVID-19 Vaccine Boosters for Older Adults and Certain Groups

The Centers for Disease Control (CDC) is now recommending that adults over the age of 65 and other groups who received initial doses of the COVID-19 vaccine should get a booster shot.  

As recent evidence suggests that immunity from the COVID-19 vaccination may wane over time, booster doses are recommended for older adults and younger people with underlying conditions or certain risk factors who received the Pfizer or Moderna vaccine more than six months ago, and anyone who received the one-shot Johnson & Johnson vaccine at least two months ago.  Health officials are now permitting the "mixing and matching" of vaccines, so recipients may choose a different COVID-19 vaccine than their original shot.

A single COVID-19 vaccine booster shot is now recommended if you completed a Pfizer or Moderna (mRNA) vaccination series six or more months ago and you are:

  • Aged 65 or older or
  • A long-term care resident that is aged 18 or older, or
  • Aged 50-64 and have an underlying medical condition, or 
  • Aged 50-64 and at an increased risk due to poverty or lack of healthcare access

Boosters should also be considered if you are:

  • Aged 18-49 and have an underlying medical condition or are at risk due to poverty or lack of healthcare access or 
  • Aged 18-49 and work or live in a high-risk setting, such as a shelter

The booster dose for the Moderna vaccine is one-half the dose used for the initial series.  Booster doses are also recommended for anyone aged 18 and older who received the one-shot Johnson & Johnson vaccine.

Any eligible person seeking a booster shot should consult with their medical provider or access the booster through a chain pharmacy.  Visit for more information.

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