NEW YORK (CBSNewYork) — The Mount Sinai Hospital patient who has been in isolation since Monday does not have the Ebola virus, hospital officials said Wednesday afternoon.

“We would like to report that the Centers for Disease Control and Prevention have determined that the patient kept in isolation since Monday, August 4, 2014 at The Mount Sinai Hospital has tested negative for Ebola Virus Disease (EVD),” the hospital said in a statement. “The patient is in stable condition, is improving, and remains in the care of our physicians and nurses.”

It was not immediately clear what disease the man was suffering from. He had recently taken a trip to West Africa.

As WCBS 880’s Monica Miller reported, the CDC said so far, three Americans in the United States have been tested for the virus, and all of the tests have came back with negative results.