The nurse had treated two Spanish missionaries who lost their lives due to the disease, after they had returned to the country after a tour in Africa.
40-year-old began to feel distress on September 30, but only sought medical help on Sunday. Meanwhile, other members of the medical team are monitoring.
Priest Viejo Manuel Garcia, 69, died on September 25 after being affected by Ebola in Sierra Leone. While 75-year-old Miguel Pajares died in similar circumstances after a mission in Liberia.
Meanwhile, President Barack Obama has announced plans to scan passengers traveling to the United States. He has criticized foreign governments have not acted "with appropriate aggressiveness" to stop the epidemic virus.
"Countries that think they can stand alone as the United States will deal with the problem of producing a response inefficient, slow, and that will bring people's deaths," said Obama.
"Also, it means that the potential spread of the disease outside the affected areas of West Africa will become a concrete danger," added the president of the United States.
About 3,400 people have been killed since the fall of the Ebola virus, most of them in West Africa.
Decrease the likelihood of a disease in the United States are "extremely low", "but we can not afford mistakes," Obama added further.