A patient at a New York City hospital who recently traveled to West Africa and reported symptoms similar to those of the Ebola virus has tested negative for the disease, officials said on Wednesday.

The patient, whose name has not been released, was kept in isolation at Mount Sinai Hospital after he arrived at the emergency room late Sunday with a high fever and gastrointestinal problems. Residents were concerned that the city could have its first case of the deadly disease, but health officials said that the patient was unlikely to have Ebola.

On Wednesday, the Centers for Disease Control and Prevention released a statement saying that the patient had tested negative for the Ebola virus.

“The patient is in stable condition, is improving, and remains in the care of our physicians and nurses,” the statement said.