People wearing masks line up for a food drive in Brighton Park on Chicago’s Southwest Side on April 23, 2020. (WTTW News)

The Centers for Disease Control and Prevention recently updated its guidance on face masks for preventing the spread of COVID-19. An infectious disease doctor explains what you need to know. 

This Feb. 5, 2021, file photo shows the Pfizer logo displayed at the company's headquarters in New York. (AP Photo / Mark Lennihan, File)

Pfizer Inc. said Friday that its experimental antiviral pill for COVID-19 cut rates of hospitalization and death by nearly 90% in high-risk adults, as the drugmaker joined the race for an easy-to-use medication to treat the coronavirus.