Pfizer and Moderna have asked the FDA to authorize their COVID-19 vaccines for a second booster, while Johnson & Johnson has not and points to studies the company says demonstrate the durabilit…
– makers of the country’s most widely used vaccines in the fight against COVID-19 – are now seeking approval for a second booster shot as immunity wanes and more contagious variants come ashore. Good news for some.
In the early rush to develop vaccines to combat the deadly coronavirus, Johnson & Johnson’s one-shot contribution was roundly heralded. It promised protection two weeks after a single shot, didn’t use the new messenger-RNA technology of the other brands or need special cold storage, making it attractive for people without easy access to pharmacies and health care facilities.
Other countries like Germany and France have called for J&J’s shot to be followed by two other doses. The city of, too, citing studies suggesting a J&J shot and single booster isn’t good enough, and many doctors have urged a third dose. But federal health authorities have been silent on whether J&J plus a booster is as good as three Pfizer or Moderna shots, let alone four.
Evidence of waning immunity and the emergence of more contagious virus variants like delta and omicron spurred approval for booster doses last fall for all three authorized vaccines in the U.S. – initially with no brand preference. Those vaccinated with Pfizer or Moderna were urged to get a booster five months after their second shot, and those who had J&J were told to get a booster after two months.recommended the Pfizer and Moderna vaccines over J&JStill, 16.
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