San Francisco health officials are allowing people who originally got the Johnson & Johnson COVID-19 vaccine to get a second booster shot — which would give them access to the same number of doses currently available to recipients of Pfizer-BioNTech or Moderna.

The allowance of a potential third dose to J&J recipients in San Francisco goes beyond the guidance outlined by the federal government. The U.S. Centers for Disease Control and Prevention says those who got J&J — which is formulated as a single-shot vaccine — are eligible to get one booster at least two months after their initial dose, but federal health officials have not yet made statements about further follow-up shots.

By contrast, those who are up to date on Pfizer-BioNTech or Moderna — collectively known as mRNA vaccinations — could already have received three shots.

“We are now offering what we’re calling a supplemental dose to J&J recipients,” Dr. Grant Colfax, the San Francisco health director, told health commissioners Tuesday.

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