https://techcrunch.com/2021/01/29/johnson-johnsons-covid-19-vaccine-is-85-effective-against-severe-cases-and-66-effective-overall-per-trial-data/

Another COVID-19 vaccine is almost ready to begin being distributed – a single-shot inoculation made by Johnson & Johnson’s Janssen pharmaceutical subsidiary. The company just released an efficacy report based on data from its Phase 3 trial, which found that the new vaccine is 66% effective overall in preventing moderate to severe incarnations of COVID-19 in those who received the jab, and 85% effective in preventing sever disease.

Those numbers aren’t as impressive as the reported figures for the Moderna and Pfizer/BioNTech vaccines that are already being distributed via emergency FDA approval, both of which reported 90+% efficacy. But Johnson & Johnson’s vaccine is a single shot rather than a two-course treatment, which should make it much easier to distribute much more quickly. The vaccine also showed 100% efficacy in preventing hospitalization or death among participants in the trial, 28 days after vaccination, which is a key measure when considering the broader impact of COVID-19 on healthcare resources, and efficacy varied by region, with the jab proving 72% effective in the U.S. across moderate and severe cases vs. 66% globally.