The United States banned travelers from the European Union on March 13, too late to stop widespread community transmission in New York City, the federal Centers for Disease Control and Prevention said on Thursday. CDC researchers analyzed the genetic code of virus samples collected from three dozen infected New Yorkers in early March and found that most of the early coronavirus cases could be traced back to Europe. It also confirms what many researchers have said: New York City has begun to spread the community widely through mitigation measures such as travel bans, suspension and suspension orders.
https://news.yahoo.com/m/d74b3078-8e03-3afd-8c44-6ce585ff3395/cdc-confirms-that-coronavirus.html?guccounter=1