NEW YORK -- Investigators are learning more about the recent activities of an emergency room doctor who is being treated for Ebola in New York, the city's first case of the virus.
On September 18, Dr. Craig Spencer posted on Facebook that he was "off to Guinea with Doctors Without Borders."
The 33-year-old worked with Ebola patients there for three weeks. Guinea was the first place in West Africa where the outbreak was identified.
Spencer left that country on October 14, traveled to Brussels and arrived in New York on October 17.
From that point forward the doctor self-monitored, taking his temperature twice a day.
On Tuesday, he started to feel fatigued but visited friends and traveled throughout the city.
He went to a meatball restaurant in downtown Manhattan and had coffee at a popular outdoor park.
On Wednesday, he ran three miles in his neighborhood and that evening took the subway from is apartment in Harlem to a bowling alley in Brooklyn. After bowling with his fiancee and two friends, he then took an Uber car service home.
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The next morning, between 10 and 11am, Spencer developed a fever of 100.3 and contacted health officials.
Thursday afternoon, ambulance crews rushed him to Bellevue Hospital, a designated Ebola treatment center.
"In the last few weeks, the protocols have improved greatly, the ability to address the situation has improved greatly," New York Mayor Bill de Blasio said. "Look at the juxtaposition of what happened in Dallas and what happened here. It's an entirely different situation once you are prepared."
Health officials are in the process of testing and decontaminating the doctor's apartment. CBS News spoke with one of his neighbors by phone Friday afternoon.
"I took Clorox wipes and cleaned my door knob inside and I didn't touch theirs, but the other door knob I cleaned," the woman told us. "I cleaned the elevator panel, just so that I'm confident those surfaces are clean."
All of the businesses visited by the doctor have been determined safe by health officials.
An adviser to de Blasio said Friday afternoon that Spencer is in "relatively stable" condition.
Dr. Irwin Redlener added that Spencer is not "out of the woods" yet, but the chances of his condition dramatically worsening are "very, very limited." Spencer's fiance also is hospitalized in isolation.
The governors of New York and New Jersey announced Friday that passengers arriving at New York area airports from West Africa will be placed under a mandatory quarantine if they had direct contact with Ebola patients.
Starting Monday there will be new national travel protocols as well. Anyone traveling into the U.S. from Guinea, Liberia and Sierra Leone will be required to self-monitor for fever for 21 days, and will also be contacted daily by designated health officials.