An F.D.A. panel recommends a Moderna booster for many Americans.

[JT45242]

7. Mix and match study shows good stuff too --

https://www.medpagetoday.com/infectiousdisease/covid19vaccine/95035

"A so-called "mix and match" COVID vaccine series using a different booster than the primary series was safe and produced an increase in immune response comparable to or greater than when the primary series and booster were the same vaccine, researchers found.

Adults who were vaccinated with Pfizer, Moderna or Johnson & Johnson vaccines produced an increase in serum binding antibody levels following a booster dose of a different vaccine, with a 4.6-fold to 56-fold increase in geometric mean titers (GMT) at day 15, reported Robert Atmar, MD, of Baylor College of Medicine in Houston, and colleagues.
Moreover, the greatest increase in immune response was among those who had a Johnson & Johnson one-dose primary series, followed by a Pfizer or Moderna booster, with a 33-fold and 56-fold increase, the authors wrote in a highly anticipated preprint on medRxiv, which has not undergone peer-review."

I got J&J and would love to get a Moderna booster with those numbers.