In the New England Journal of Medicine, article link here: Ad26.COV2.S Vaccine Efficacy against Covid-19
The summary of the piece:
- In a randomized trial involving nearly 40,000 persons, vaccine efficacy was 66% against infection and 85% against severe-critical Covid-19. Efficacy against the variant first identified in South Africa was 64% against moderate disease and 82% against severe-critical disease.
Check out that link above for more.