The US Food and Drug Administration announced on Friday that for people aged 18 and over, the time between receiving the primary series of the Moderna COVID-19 vaccine and receiving a booster dose has been cut by one month to at least five months.

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"Vaccination is our best defense against COVID-19, including the circulating variants," said Peter Marks, director of the FDA's Center for Biologics Evaluation and Research. "Shortening the time between completion of the primary series and a booster dose may help reduce waning immunity."

The action comes after the FDA decided on Monday to shorten the time between booster doses of Pfizer's and BioNTech's COVID-19 vaccine from six to five months, claiming that this would provide better protection against the fast-spreading Omicron version.