Vaccine experts: COVID-19 booster shots aren't needed now

What they're saying: "Even if boosting were eventually shown to decrease the medium-term risk of serious disease, current vaccine supplies could save more lives if used in previously unvaccinated populations than if used as boosters in vaccinated populations," the scientists wrote.

• They did say booster doses could be appropriate for immunocompromised people, and indeed that population can get a third dose of an mRNA vaccine.

The bottom line: Medical ethicists and scientists have not supported widespread booster shots, as the vaccines are still extremely effective in preventing severe COVID-19 and death, and considering a majority of the world still hasn't gotten one shot.