Johnson & Johnson's Covid-19 vaccine candidate begins Phase 3 trials in the United States today. Trials for the single-dose vaccine will include up to 60,000 adult participants at nearly 215 sites in the US and internationally./Credit: Mel Evans/AP
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Johnson & Johnson's coronavirus vaccine is fourth to begin Phase 3 trials in the United States
Johnson & Johnson's Covid-19 vaccine candidate begins Phase 3 trials in the United States today. Trials for the single-dose vaccine will include up to 60,000 adult participants at nearly 215 sites in the US and internationally.
