Results from a clinical trial involving people in the United States, South Africa and Latin American countries found that COVID-19 Vaccine Janssen was effective at preventing COVID-19 in people from 18 years of age.
The study involved over 44,000 people with half of the patients receiving a single dose of the vaccine and half were given placebo.
People did not know if they had been given COVID-19 Vaccine Janssen or placebo.
The trial found a 67 percent reduction in the number of symptomatic COVID-19 cases after two weeks in people who received COVID-19 Vaccine Janssen (116 cases out of 19,630 people) compared with people given placebo (348 of 19,691 people).
Meaning the vaccine efficacy was at 67 percent.
source: express.co.uk