Breaking: NYC doctor tests positive for Ebola

Health authorities declined to say how many people in total might have come into contact with Dr. Spencer while he was symptomatic.

Mayor Bill de Blasio, speaking at a press conference Thursday evening before the diagnosis, said Dr. Spencer has given health workers a detailed accounting of his activities over the last few days.

“Our understanding is that very few people were in direct contact with him,” Mr. de Blasio said.