Should health care workers returning from Ebola hot zones be quarantined?

A doctor who recently returned from Guinea has tested positive for Ebola - the first case of the deadly virus in New York City and the fourth diagnosed in the United States.

The doctor, identified as Craig Spencer, 33, came back from treating Ebola patients in Guinea on October 17 and developed a fever, nausea, pain and fatigue Thursday. He is isolated in stable condition at New York's Bellevue Hospital Center, one of the eight hospitals statewide that New York Gov.

Spencer, who is in intensive care, went for a jog, may have gone to a restaurant, traveled the city's subway system and went bowling before feeling ill, but authorities sought to assure an anxious public that the likelihood of him spreading the virus was low.

"We want to state at the outset there is no reason for New Yorkers to be alarmed," Mayor Bill de Blasio told reporters late Thursday.

There's no question Spencer was heroic -  he traveled to west Africa to treat Ebola patients. But many people are outraged that he traveled around the most populated city in America when he was feeling "sluggish."

As a doctor, should he have known better?

Miguel Marquez has the report.