After a Thanksgiving weekend when the number of people traveling through U.S. airports reached the highest total since mid-March, a top government official said some Americans could begin receiving coronavirus vaccinations before Christmas.

A study showed the use of convalescent plasma provided no clinical benefit nor improved mortality in Covid-19 patients with pneumonia.

Pfizer Inc. applied to U.S. health regulators for emergency use authorization (EUA) of the company’s Covid-19 vaccine, the first such application in a major step toward providing protection against the new coronavirus.

U.S. Health Secretary Alex Azar said if pharmaceutical company Pfizer Inc. submits interim Covid-19 vaccine to health regulators as quickly as expected, the U.S. government anticipates the beginning of vaccinating Americans in December.