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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