The delta variant now accounts for the vast majority of new cases in the United Kingdom, where hospitalizations and deaths continue to climb.
WBZ-TV's Dr. Mallika Marshall reports.
The delta variant now accounts for the vast majority of new cases in the United Kingdom, where hospitalizations and deaths continue to climb.
WBZ-TV's Dr. Mallika Marshall reports.
The delta variant now accounts for 1 in 4 infections in the United States. Dr. Mallika Marshall explains why wearing a mask could..