Johnson & Johnson to br Begin Human Trials forbr COVID-19 Vaccine The early-stage human trial will begin br in the second half of July as opposed to br its initial forecast of September. J&J's Paul Stoffels, br via press release The company began developing the br vaccine in January and is implementing br the same technologies used for its br experimental Ebola vaccine in 2019. J&J announced earlier this year that if the vaccine is proven to be safe, it could produce br 600 million to 900 million doses by April 2021. As of June 2, there are approximately br 124 COVID-19 vaccines in the works, br according to the World Health Organization.