Gov. Andrew Cuomo and New Jersey Gov. Chris Christie have ordered mandatory 21-day quarantines for all doctors and other travelers who have had contact with Ebola victims in West Africa.

About 150 people a day arrive in the United States from West African nations. Dr. Craig Spencer was one of those travelers who landed at John F. Kennedy International Airport a week ago.

Travelers from the affected countries in West Africa must undergo screening at airports and are medically monitored for 21 days. But Dr. Bruce Hirsch, an infectious disease specialist, says even with those measures, it's difficult to tell who's been recently infected.

Rep. Peter King (R - Seaford) has previously called for a temporary travel ban for people coming from nations with an Ebola outbreak. He also called for doctors to be quarantined.

It's not clear how or where that mandatory quarantine will be served.