On Friday, a panel of expert advisers to the US Food and Drug Administration will vote on the approval of a booster shot of Johnson & Johnson's vaccine for those aged 18 and up, as well as the proper time between the two doses.

The FDA's experts will vote on whether the booster shot should be administered at least two months after the first shot or at least six months after the first shot.

The FDA is not obligated to accept their recommendations, but it does so frequently.

Johnson & Johnson CEO Alex Gorsky's Message Regarding Recent US Events

On Thursday, the independent expert advisers voted unanimously to suggest booster shots of Moderna  COVID-19 vaccine for Americans 65 and older, as well as those who are at high risk of severe disease or occupational exposure to the virus.

The use of boosters for Moderna and J&J will be considered by a panel of experts at the US Centers for Disease Control and Prevention next week, followed by the CDC director.

Last month, the US Food and Drug Administration approved a booster dosage of Pfizer's and BioNTech SE's vaccine.

On Friday, the panel will also debate the benefits of "mixing and matching" vaccines or administering a booster shot that differs from the first dosage or doses. They'll look at data from 458 people who were given a mix of Pfizer/BioNTech, Moderna, and J&J shots in a National Institutes of Health trial.

People who received J&J's COVID-19 vaccine as a first injection had a better immune response when boosted with vaccinations from Pfizer or Moderna, according to study findings released on Wednesday.