That place is like a foreign country. The subways are perfect virus spreading vehicles with everyone packed up.
That and the CDC was specifically NOT testing for coronavirus unless the person had been traveling to China or was in contact with someone who was known to have it. We could have thousands of cases out there that are unconfirmed, and thousands more that are minor enough that they never went to the doctor.It's implausible to believe NYC and other big cities are not already circulating the virus.
Major airport, major tourist location, massive population, very dirty and crowded.