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CDC considers this fourth shot a booster and those getting this additional shot will get a dose that is half the volume of the first shots. The agency says these fourth shots can be administered at least six months after their third Pfizer or Moderna shot - February 2022 at the earliest.

Fourth shot possible for immunocompromised. The CDC says people over age 18 who are "moderately to severely immunocompromised" and have already gotten a third dose of either the Pfizer-BioNTech or Moderna COVID-19 vaccine may get a fourth shot of either of those vaccines or the Johnson & Johnson product.

COVID vaccines for children under 5 are still being studied. CDC's Advisory Committee on Immunization Practices (ACIP) is scheduled to meet on Nov. The next step is for the Centers for Disease Control and Prevention (CDC)'s advisory committee to give its recommendations to the CDC director on the vaccines use in this younger age group and for her to sign off on those recommendations. Clinical trials of a few thousand children found the product to be highly effective at preventing illness caused by a coronavirus infection, and the panel determined that the benefits of the vaccine outweigh its risks - the biggest concern being myocarditis, or inflammation of the heart.

The vaccine is a two-shot series that is one-third of the dose given to adults.

Clearing the product for this age group makes the vaccines available to about 28 million more Americans.

FDA authorizes COVID-19 vaccine for kids ages 5 to 11. The Food and Drug Administration (FDA) has added children ages 5 to 11 to the emergency use authorization (EUA) for the COVID-19 vaccine from Pfizer-BioNTech.