The Johnson & Johnson company reported that phase 3 trials of its covid-19 vaccine began in the United States on Wednesday.
It is the fourth vaccine to undertake large-scale clinical trials, only after Moderna, Pfizer-BioNTech and AstraZeneca.
Johnson & Johnson vaccine enters phase 3
2020-09-23T23:14:30.987Z
Johnson & Johnson reported that phase 3 trials of its covid-19 vaccine began in the United States on Wednesday.
