Mayor de Blasio addressed the press at mid-day Friday with the latest updates on Dr. Craig Spencer, the Harlem resident who has tested positive for Ebola, and the city's response to the potential health crisis. And as expected, he preached calm: "There is no cause for everyday New Yorkers to be alarmed," he said. "Ebola is an extremely hard disease to contract. There’s no reason for New Yorkers to change their daily routines in any way.”

"New Yorkers who have not been exposed to an infected Ebola patient's body fluids are not at risk," he reiterated. He praised city health officials and health care professionals at Bellevue Hospital: "We’ve had clear and strong protocols from the beginning and they have been handled to the letter," de Blasio said. “The patient is being held in isolation at Bellevue and poses no threat to others."

Dr. Mary Bassett, Commissioner of the NYC Health Department, said Spencer is in stable condition and called him a "truly courageous young man." Dr. Rima Khabbaz said that Spencer first experienced a fever on Thursday morning (he had a low grade fever around 100.3), but that he has "remained asymptomatic... he had no loss of control of body fluids."

Bassett added that a complete timeline of his movements will be made public later today, and said that health officials had visited all the establishments Spencer was at: "We have visited the bowling alley [The Gutter]...we have verified events, and the place has been cleared by the Health Department for opening."

As for what the public can do to help, de Blasio said:

People in a moment of crisis always ask ‘what can we do’, ‘what should I know’… we’ve made clear all the things Ebola is not, all the ways it does not transmit… first, if you or a loved one feels you may meet the qualifications—meaning you have travelled to the three countries in West Africa and you have the symptoms—you must call 911 immediately… if you fit those criteria, call 911 or go to a hospital emergency room. Do not wait, do not hesitate, do not wait to see if you get better...We have to make sure our medical professionals can focus on this crisis properly. They don’t need to have false reports clogging up the system.

When asked further about people being monitored once returning from overseas, de Blasio noted: "People have a right in a free society to say and think what they want. But this is a health crisis. We insist upon cooperation in terms of knowing where someone's been and their symptoms...and can use force if need be."

[with additional reporting by Jessica Warriner]