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The second of two Americans stricken with Ebola in the West African nation of Liberia arrived in the United States on Tuesday for treatment, Bo sung dinh duong cho nguoi gia according to media reports.

Carried in a plane specially outfitted with an isolation unit, Nancy Writebol, 59, arrived just outside Atlanta Tuesday morning, NBC News reported. She was taken to Emory University Hospital where she was wheeled in on a stretcher. Another American patient with Ebola, Dr. Kent Brantly, 33, is already receiving care at the facility.

Brantly was delivered Saturday morning to Emory in the same plane and is showing signs of improvement, experts said.

Media reports published Monday said that both Brantly and Writebol received an experimental drug while in Liberia that appears to have helped them recover from Ebola, which has a high fatality rate.

Brantly “seems to be improved from the reports we got earlier,” Dr. Tom Frieden, director of the U.S. Centers for Disease Control and Prevention, said Sunday on NBC’s “Meet the Press.”

An unnamed source told CNN that the U.S. National Institutes of Health contacted Samaritan’s Purse, the aid agency Brantly works for, and offered three vials of an experimental treatment called ZMapp for use in both patients.

According to the CNN source, ZMapp is a drug being developed by San Diego-based biotech company Mapp Biopharmaceutical. Bo sung dinh duong cho van dong vien Although the medicine has shown promise in trials involving monkeys, it has never been tested in humans. In the primate trials, four monkeys infected with Ebola survived after getting Zmapp within 24 hours of infection, and two of four other monkeys survived after getting the serum within 48 hours of infection.

CNN said that Brantly woke up July 22 feeling feverish and immediately put himself into isolation. Writebol came down with similar symptoms three days later, and blood tests confirmed that both Americans had contracted Ebola.

ZMapp must be kept frozen. Upon its arrival at the Liberian hospital where Brantly and Writebol were being treated, the serum was allowed to thaw naturally, a process taking 8 to 10 hours, CNN said.

According to a CNN source, Brantly asked that Writebol be g