Brussels — Johnson & Johnson (J & ) could produce one-billion doses of its potential Covid-19 vaccine in 2021 if it proves successful and would consider injecting healthy volunteers with the novel coronavirus if there were not enough patients for final trials, a company executive said.

J & began early-stage human safety trials for its potential Covid-19 vaccine in July after releasing details of a study in monkeys that showed its best-performing candidate offered strong protection in a single dose...

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