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A nurse in Spain on Monday, became the first person known to catch Ebola outside the outbreak zone in West Africa, according to reports. The incidence has raised concerns worldwide. 

The U.S. government has ordered more careful screening of airline passengers arriving from the region. 

Already hospitalized in the U.S., a critically ill Liberian man, Thomas Duncan, began receiving an experimental drug in Dallas. But there were encouraging signs for an American video journalist who returned from Liberia for treatment. Ashoka Mukpo, 33, was able to walk off the plane to a waiting ambulance, and his father said Muko's symptoms of fever and nausea appeared mild, a press release mentioned. 

"It was really wonderful to see his face," said Dr. Mitchell Levy, who talked to his son over a video chat system at Nebraska Medical Center.

The stricken nurse had been the part of a team that treated a priest who was flown home to Spain from Sierra Leone to be treated for Ebola. The 69-year-old priest died in the hospital. 

Nurse's only symptom was a fever, but the presence of Ebola virus was confirmed by two tests, Spanish health officials said.