The contagious delta variant is driving up COVID-19 hospitalizations in the Mountain West and fueling disruptive outbreaks in the North, a worrisome sign of what could be ahead this winter in the U.S.
The U.S. opened its doors to international travelers on Monday after more than 18 months of COVID-19 restrictions, and some airports across the world celebrated the milestone with pomp and circumstance.
An analysis of hundreds of COVID-19 cases suggests that face masks are most protective in specific circumstances, such as exposure to a person with COVID-19 that lasts for more than three hours or that takes place indoors1.
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