Johnson & Johnson COVID-19 vaccine – Wikipedia

The Johnson & Johnson COVID-19 vaccine is a human adenovirus viral vector COVID-19 vaccine developed by Janssen Pharmaceutical, a subsidiary of Johnson & Johnson (J&J); and Beth Israel Deaconess Medical Center (BIDMC), based in Boston, Massachusetts. On 29 January 2021, Janssen announced that it was 66% effective in a one-dose regimen in preventing symptomatic COVID-19, with an 85% efficacy in …

https://en.m.wikipedia.org/wiki/Johnson_%26_Johnson_COVID-19_vaccine