The U.S. government has not yet formally authorized booster shots for those who received an initial dose of the Johnson & Johnson COVID-19 vaccine, as researchers are still debating the medical risks and benefits.
Many experts seem to agree at least that immunocompromised people and older adults will likely benefit from a booster shot, in some cases recommending a Moderna or Pfizer formulation following the initial J&J shot. In August 2021, the city of San Francisco began offering Moderna and Pfizer boosters to those who earlier received the J&J shot.
Prominent experts have publicly declared intentions to “mix and match” a Moderna or Pfizer booster following their initial J&J shot, the New York Times reported, despite the lack of “rigorous” data. Those who want a booster may need “some deviousness” to find a drugstore willing to administer it at this point, it noted.