[Press release – not published yet] J&J says booster shot at two months provided 75% protection against moderate to severe COVID-19 globally and 94% of such cases in the U.S.

Press release: Johnson & Johnson Announces Real-World Evidence and Phase 3 Data Confirming Strong and Long-Lasting Protection of Single-Shot COVID-19 Vaccine in the U.S.

Commentaries:

Johnson & Johnson says additional dose boosts Covid vaccine efficacy – STAT

J&J booster 94% effective against severe COVID, company says – CIDRAP

Two dose version of Johnson & Johnson shot 94% effective against Covid-19, study finds – CNN

Commentaries on Twitter

(thread – click for more)

?BREAKING—At last—new data on 2-doses of Johnson & Johnson's #vaccine (doses 56 days apart) is 94% effective against symptomatic #COVID19, thus comparable to Moderna/Pfizer. And 100% effective against severe COVID. Booster for 1 dose works well too. ?https://t.co/3nPkodOjuG pic.twitter.com/DizjWt9NYX

— Eric Feigl-Ding (@DrEricDing) September 21, 2021

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First press released results out for the double-dose J&J vax trial, ENSEMBLE 2. With 2 months between doses, efficacy against moderate to severe/critical increased – didn't provide overall efficacy data though. Adverse reactions similar to 1st dose …1/n https://t.co/BmBVtLvEaW

— Hilda Bastian, PhD (@hildabast) September 21, 2021