The New York City doctor who became infected with the Ebola virus last week initially lied to health officials about his movements around the city after he returned from treating victims of the disease in West Africa, according to a published report.

The New York Post, citing law enforcement sources, reported that Dr. Craig Spencer initially told investigators that he had self-quarantined in his Harlem apartment. According to the paper, Spencer's story fell apart after investigators checked his credit-card statement and information from his Metrocard.

Spencer, 33, returned to New York from Guinea on Oct. 17 and was rushed to Bellevue Hospital Center on the morning of Oct. 23 with fatigue, nausea, and a 100-degree fever. In the intervening period, he traveled on three of the city's most heavily-trafficked subway lines, visited the High Line park and a Greenwich Village restaurant in lower Manhattan, and went for a three-mile run before going bowling at an alley in Brooklyn the day before he was hospitalized.

Spencer didn't admit the extent of his travels until a New York police officer "got on the phone and had to relay questions to him through the Health Department," the Post quoted a source as saying.

The doctor had spent the month prior to his return treating people with the deadly virus as a volunteer for Doctors Without Borders in West Africa. New York Mayor Bill de Blasio said Monday that Spencer's condition remains serious but stable. No infection has been found in his fiancee but she remains under quarantine at the couple's Harlem home. No one else has been reported as infected, and city health officials said New Yorkers should not be alarmed about contracting the disease.

More than 4,900 Ebola deaths have been reported this year during the current epidemic, nearly all of them in Guinea, Liberia and Sierra Leone.

The Associated Press contributed to this report.

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