Rising Covid-19 cases in some states highlight ‘precarious position’ as variants build up in U.S.
The United States is in for a celebratory summer, experts and political leaders have forecasted — when widespread availability of Covid-19 vaccines will allow the safe return of gatherings and activities shunned for the past year.
But epidemiologists have been warning it might not be a smooth road to that point, and now, data in some states are pointing to, if not just stalled progress, increased cases.
