Based on the most recent data, the CDC updated its recommendation for boosters in those who got the Pfizer vaccine.
The recommended interval has been shorted - only for Pfizer - from six months to five months, the agency says.
"This means that people can now receive an mRNA booster shot 5 months after completing their Pfizer-BioNTech primary series. The booster interval recommendation for people who received the J&J vaccine (2 months) or the Moderna vaccine (6 months), has not changed," the CDC says.
Additionally, consistent with our prior recommendation for adults [cdc.gov], CDC is recommending that moderately or severely immunocompromised 5–11-year-olds receive an additional primary dose of vaccine 28 days after their second shot. At this time, only the Pfizer-BioNTech COVID-19 vaccine is authorized and recommended for children aged 5-11.
"As we have done throughout the pandemic, we will continue to update our recommendations to ensure the best possible protection for the American people. Following the FDA’s authorizations, today’s recommendations ensure people are able to get a boost of protection in the face of Omicron and increasing cases across the country, and ensure that the most vulnerable children can get an additional dose to optimize protection against COVID-19. If you or your children are eligible for a third dose or a booster, please go out and get one as soon as you can. Additionally, FDA took action this week to authorize boosters for 12-15 year olds – and I look forward to ACIP meeting on Wednesday to discuss this issue," said CDC Director Dr. Rochelle Walensky.