AKIPRESS.COM - A New York City doctor who recently treated Ebola victims in Guinea has been diagnosed with the disease in a New York hospital, reports VOA.

At an evening news conference, Mayor Bill de Blasio confirmed the case, saying there is no reason for alarm and the doctor has been placed in isolation. Officials say preliminary test results at the city's Bellevue Hospital on Dr. Craig Spencer are positive. The U.S. Centers for Disease Control will carry out a second test to confirm the results.

Earlier Thursday, Spencer notified the medical charity Doctors Without Borders - for whom he worked in Guinea - that he had a high fever and was nauseous; two symptoms of Ebola.

Officials are now looking for anyone who may have had contact with Spencer. He would be the fourth person diagnosed with Ebola on U.S. soil, and the first in New York. Earlier Thursday, the West African nation of Mali reported its first case of Ebola. Heath Minister Ousmane Kone said on state television that the patient is a 2-year-old girl who was brought to a hospital from neighboring Guinea.

Kone said the young girl's condition is improving thanks to quick treatment. She is in the western town of Kayes. The Ebola outbreak is concentrated in three West African countries -- Guinea, Liberia and Sierra Leone.

It has killed close to 4,900 people, including victims in the United Sates and Spain. There are almost 10,000 confirmed or probable cases. U.S. government health officials are ordering travelers from Guinea, Liberia and Sierra Leone to monitor their health for 21 days and give local health departments daily reports.

The monitoring program starts Monday in six eastern states - Georgia, Maryland, New Jersey, New York, Pennsylvania and Virginia - where the majority of those travelers would visit. They will be given an Ebola kit when they arrive at airports, including a thermometer.

In the latest case in New York, Governor Andrew Cuomo said Dr. Spencer was familiar with symptoms and handled himself accordingly once he experienced symptoms.

Cuomo said the city is "as ready as one can be for this circumstance" and has been preparing for weeks to handle a possible Ebola case.

The earlier Ebola cases in the U.S. include a Liberian man who died in a Dallas, Texas hospital two weeks ago. Two nurses who treated him are currently hospitalized, but are said to be doing well.