President Donald Trump speaks at a Nov. 20 news conference in the briefing room at the White House (Susan Walsh/AP)
Covid-19 roundup: Pfizer and Moderna won't attend White House's 'Vaccine Summit' — report; Sinovac clarifies efficacy numbers
Though the White House is planning on hosting a “Vaccine Summit” on Tuesday, two major players will not be attending.
Pfizer and Moderna have both …
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