A new National Institutes of Health (NIH) study suggested Moderna's or Pfizer's vaccine also work as a booster for J&J recipients and may benefit more from getting a Pfizer or Moderna vaccine as their booster instead of another J&J shot. The study is preliminary and hasn't been peer reviewed.

People who received an mRNA-based booster vaccination had a four-fold increase in their neutralization response more frequently than those who were boosted with J&J's adenovirus vaccine.

During the Friday meeting of the FDA’s Vaccines and Related Biological Products Advisory Committee (VRBPAC), a top FDA official told the committee that the agency might consider allowing Johnson & Johnson recipients to receive a booster shot of the Moderna or Pfizer-BioNTech vaccines but gave no timetable for that decision.

Click here for NPR story on NIH study: NIH study of COVID-19 vaccine boosters suggests Moderna or Pfizer works best

Click here for a draft of the NIH study: Heterologous SARS-CoV-2 Booster Vaccinations – Preliminary Report