Researchers have developed a model that uses social-media and search data to forecast outbreaks of Covid-19 well before they occur.
A popular spring break and summertime destination on the South Carolina coast is linked to clusters of coronavirus cases among teenagers and young adults in several states.
Gov. Greg Abbott of Texas ordered most state residents to wear masks in public, after opposing local officials’ efforts to require them. Britain’s prime minister urged restraint when pubs reopen this weekend.