A doctor who treated Ebola patients in Guinea, West Africa, Craig Spencer, has tested positive to the Ebola Virus Disease, making him the first recorded case in America’s largest city, New York, and the ninth in the country.

Spencer came back from treating Ebola patients in the Ebola hit country on October 17 and developed a fever, nausea, pain and fatigue on Thursday.

New York authorities said he is currently in isolation and being treated at the city’s Bellevue Hospital, one of the eight hospitals statewide that governor Andrew Cuomo designated earlier this month as part of an Ebola preparedness plan.

In spite of the widespread fear that the disease was spreading in the country, New York, Mayor Bill de Blasio said residents were free to travel around the city, even as officials revealed that Spencer may have gone to a restaurant, traveled the city’s vast subway system and gone bowling before falling ill. Authorities said that the possibility of him spreading the virus was low.

Spencer had worked with the humanitarian organization, Doctors Without Borders in Africa.

According to city officials, he first developed Ebola symptoms on Thursday morning and was taken from his Manhattan apartment to isolation at Bellevue Hospital by a team wearing protective gear.

Health officials said three people who had been in contact with Spencer – his fiancée and two friends – would be quarantined and monitored.

The fourth contact, a car service driver, was reported to have no physical contact with Spencer and was not considered at risk.

The Ebola disease has killed about 4,900 people, mostly in Liberia, Sierra Leone and Guinea since the latest outbreak in March.