As vaccine distribution ramps up, states race to stay ahead of a growing number of virus variants. In Europe, Serbia has achieved the second highest rate of vaccinations after Britain. Companies that market learning apps to schools are enjoying a pandemic windfall. …
a growing proportion of new cases there.
The new variants have most likely undercut the city’s efforts to lower the rate of positive test results, city health officials said this week, though they added that the city’s strategy for curbing the spread of the virus has not changed.
Despite expansive vaccination efforts, the citywide seven-day average rate of positive test results has not been
