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A U.S. ban on travelers arriving from the EU on March 13 came too late to
prevent widespread community transmission in New York City, according to a
report Thursday from the federal Centers for Disease Control and Prevention. CDC researchers analyzed the genetic code of virus samples collected from
three dozen infected New Yorkers in early March, and found that most of
those early cases of the coronavirus could be traced back to Europe. It also confirms what many researchers have already said: That widespread community transmission was well under way in New York City by the time mitigation