The US Food and Drug Administration (FDA) has authorised COVID-19 booster doses of Moderna and Johnson & Johnson, and approved "mix and match" booster dose for currently available approved COVID-19 vaccines.

The agency on Wednesday, 20 Ocotber, authorised the use of a single booster dose of the Moderna COVID-19 vaccine at least 6 months after completion of the primary shots to people 65 years of age and older, 18 through 64 years of age at high risk of severe COVID-19, and 18 through 64 years of age with frequent institutional or occupational exposure to SARS-CoV-2, Xinhua news agency reported.

As for the Johnson & Johnson booster dose, the FDA authorised the use of a single booster dose at least 2 months after completion of the single-dose primary regimen to individuals 18 years of age and older.

A single booster dose of any of the available COVID-19 vaccines may be administered as a "mix and match" booster dose following completion of primary vaccination with a different available COVID-19 vaccine, according to the FDA.

For instance, a person who got a Johnson & Johnson vaccine could receive one from Moderna or Pfizer-BioNTech as a booster.

"The available data suggest waning immunity in some populations who are fully vaccinated," said Acting FDA Commissioner Janet Woodcock in a statement.

The decision came after an FDA advisory committee voted last week to recommend authorizing Moderna and Johnson & Johnson's COVID-19 booster doses.

In September, the FDA authorized the first booster shots for the Pfizer-BioNTech COVID-19 vaccine, allowing a single booster dose of the Pfizer-BioNTech vaccine be administered at least 6 months after completion of the primary series to individuals 65 years of age and older, and 18 through 64 years of age with frequent institutional or occupational exposure to SARS-CoV-2.

The study found that people who received the Johnson & Johnson vaccine produced stronger antibody levels after they got booster shots made by Moderna or Pfizer-BioNTech, compared to boosters from Johnson & Johnson.

(This story was published from a syndicated feed. Only the headline and picture has been edited by FIT.)