The scientific head of the US operation to develop a vaccine, Moncef Slaoui said Monday that the green light would probably come in December.
Pfizer said the vaccine had no serious side effects and that the company will apply for emergency use authorization from US regulators "within days"
Developments on vaccine front offer a tentative timeline on when it could be available on a mass scale
Moderna, whose results stem from a clinical trial of more than 30,000 participants, expects to have approximately 20 million doses ready to ship in the United States by year-end.
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