Kent Brantly

FORT WORTH, Texas — Kent Brantly always wanted to be a medical missionary, and he took the work seriously, spending months treating a steady stream of patients with Ebola in Liberia.

Now Brantly is himself a patient, fighting for his own survival in an isolation unit on the outskirts of Monrovia, Liberia, after contracting the deadly disease.

The Texas-trained doctor says he is “terrified” of the disease progressing further, according to Dr. David Mcray, the director of maternal-child health at John Peter Smith Hospital in Fort Worth, where Brantly completed a four-year residency.

“I'm praying fervently that God will help me survive this disease,” Brantly said in an e-mail Monday to Mcray. He also asked that prayers be extended for Nancy Writebol, an American co-worker who also has fallen ill.

Brantly “went into Ebola exhausted” from treating Ebola patients, Mcray said after speaking with him Monday. His prognosis is grave and efforts to evacuate him to Europe for treatment have been thwarted because of concerns expressed by countries he would have to fly over en route to any European destination, Mcray said.

There is no known cure for Ebola, which begins with symptoms including fever and sore throat and escalates to vomiting, diarrhea and internal bleeding. The disease spreads through direct contact with blood and other bodily fluids as well as indirect contact with “environments contaminated with such fluids,” according to the World Health Organization.

Still, colleagues and family members said Brantly, 33, knew of the risks associated with working in one of the world's poorest countries during an epidemic and did not regret his choice.

“Kent prepared himself to be a lifetime medical missionary,” said his mother, Jan Brantly. “His heart is in Africa.”