Apple closed its New York City stores to shoppers after a Covid-19 spike, four college football games have been canceled and flight cancellations in the U.S. continued as staff shortages driven by a Covid-19 spike have upended the holiday season.
Despite the surge in Covid-19 — the daily number of new Covid infections was 1.44 million on Monday, according to data from Johns Hopkins University — the Centers for Disease Control and Prevention shortened the recommended isolation period for people with Covid-19 to five days from…