The death toll from the deadly Ebola outbreak in Africa now stands at 887.
There have been 16-hundred infections since the outbreak began, making it the largest Ebola outbreak in history.
Meanwhile, the second of two Americans fighting for their lives is expected to arrive back in the United States for treatment early Tuesday.
Jay gray has the story.
We are now learning just how incredible it was that Ebola patient, Dr. Kent Brantly, walked into Emory Hospital when he arrived Saturday.
"We're hoping to do our best that doctor brantly not only walks into the hospital but walks out of the hospital in the condition that he should be in," says Dr. Jay Varkey.
NBC News has learned that just two days before he was evacuated, Brantly's condition took a rapid turn for the worse, and that he was "near death" when he was given a dose of an experimental serum called Z-Mapp..
"What it is is a cocktail of antibodies which are proteins that the body makes to block the virus," says Dr. Anthony Fauci.
Doctors in Africa say Brantly's health improved quickly and dramatically after taking the medicine, calling the results "almost miraculous." Sources now confirm he received a second dose of the serum yesterday, his fever has decreased, and there's been some improvement in his symptoms.
His colleague - Nancy Writebol- initially thought to be in worse condition, received two doses of Z-Mapp.
This specialized private plane - the same one that transported Brantly to Atlanta - is back in Liberia today and will evacuate Writebol overnight.
She's expected to land sometime late Tuesday morning and will continue her treatment and recovery along side Brantley in the isolation unit at Emory.
Copyright 2014 Nexstar Broadcasting, Inc. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.