NEW YORK (MYFOXNY) -

A New York City doctor who was working in Africa with Doctors Without Borders has tested positive for Ebola. He is being treated in isolation at Bellevue Hospital Center in Manhattan.

The doctor, Craig Spencer, 33, returned from Guinea 10 days ago after treating Ebola patients there. Since returning, Spencer rode the A, L, and No. 1 subway lines, went running, used an Uber livery cab, and went to a bowling alley in Williamsburg called the Gutter Wednesday night, said Dr. Mary Bassett, the city's health commissioner. He also visited the High Line park in Manhattan at some point, she said. He began exhibiting a fever and diarrhea on Thursday morning,

In a statement, Doctors Without Borders said that the doctor and his fiance on Thursday morning followed guidelines by reporting his fever immediately to the Nobel Peace Prize-winning organization, which then alerted the city's Health Department.

"Today, EMS HAZ TAC Units transported a patient to Bellevue Hospital who presented a fever and gastrointestinal symptoms," Basset said in a statement earlier Thursday before the diagnosis. "As a further precaution, beginning today, the Health Department's team of disease detectives immediately began to actively trace all of the patient's contacts to identify anyone who may be at potential risk. The Health Department staff has established protocols to identify, notify, and, if necessary, quarantine any contacts of Ebola cases."

Mayor Bill de Blasio said that the man had limited contact with others since coming back from Africa and was working with health officials to identify them. One of those was his fiance, who was also brought to Bellevue. The mayor also cautioned New Yorkers that their chances of contracting Ebola are very slim, even if you were on the subway with Spencer.

Spencer is the fourth Ebola patient treated in the United States and the first case in New York City.

The CDC has sent an Ebola response team to New York. The CDC will work to confirm the diagnosis.

"In addition, CDC already had a team of Ebola experts in New York City who can offer immediate additional support," the CDC said in a statement. "The CDC experts were in New York City this week assessing hospital readiness to receive Ebola patients, including Bellevue hospital."

In a statement, Uber confirmed that Spencer used an Uber car Wednesday evening.

"We immediately contacted the CDC and NYC Department of Health and Mental Hygiene, which stated that neither our driver partner nor any of his subsequent passengers are at risk. We have communicated this to the driver, and the NYC DOHMH medical team met with the driver in person, assuring him that he is not at risk. Our thoughts are with the patient and his loved ones."

Dr. Spencer is on staff at Columbia University Medical Center, which issued a statement Thursday night.

The physician is a dedicated humanitarian on the staff of NewYork-Presbyterian/Columbia University Medical Center who went to an area of medical crisis to help a desperately underserved population," NewYork-Presbyterian said in the statement. "He is a committed and responsible physician who always puts his patients first. He has not been to work at our hospital and has not seen any patients at our hospital since his return from overseas. Our thoughts are with him, and we wish him all the best at this time."

City Council Speaker Melissa Mark-Viverito issued a statement.

"I urge New Yorkers to remain calm and to follow the protocols issued by the Department of Health," Mark-Viverito said. "My thoughts and prayers are with Dr. Spencer and his family and I join all New Yorkers in wishing him a full and speedy recovery."

Bellevue is one of eight hospitals that Gov. Andrew Cuomo designated as the front line of the state's Ebola Preparedness Plan.

The Ebola virus has killed thousands of people in West Africa in recent months.
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