NYC Changes School Rules; Germany May Delay Doses: Virus Update Bloomberg 39 mins ago Bloomberg News (Bloomberg) -- New York City said four or more Covid-19 cases in a school in a week will result in a 10-day closing, up from a two-case rule. The pandemic is erupting anew in youth sports across the U.S., prompting fresh warnings from President Joe Biden’s health advisers and adding a headwind to his push to reopen classrooms. Germany is considering spreading out the time gap between the first and second doses of mRNA shots, in a bid to speed up the country’s vaccination drive. Neighboring Poland had its deadliest day of the pandemic.