New York and New Jersey have issued mandatory quarantines for travelers who have had contact with Ebola-infected patients in West Africa.

New rules were instituted Friday by New York Gov. Andrew Cuomo and New Jersey Gov. Chris Christie in the wake of New York's first confirmed case of Ebola.

People deemed "high-level" risks will automatically be placed in a mandatory quarantine for 21 days at a government-regulated facility.

The new rules come into effect as Dr. Craig Spencer, a member of Doctors Without Borders, continues to be treated for Ebola at Manhattan's Bellevue Hospital.

Spencer returned from Guinea last Friday at John F. Kennedy International Airport and passed the Centers for Disease Control and Preventions's screening process. New York City health officials say Spencer did not show symptoms when he arrived.

Officials say the day before becoming ill, Spencer criss-crossed the city on the subway. He is currently in stable condition.