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ATLANTA (WXIA) -- From the CDC to Emory University hospital, health officials are awaiting the transfer of the second American infected with Ebola. When Nancy Writebol arrives, she will be transported in a critical care unit with a team from Grady EMS leading the way.

"There's much more pressure -- you want to make sure all of your policies and procedures are followed 100 percent accurately," said Wade Miles of Grady EMS.

The same team that brought Dr. Kent Brantly on Saturday will operate again on Tuesday. The FBI will again aid with security.

EBOLA VIRUS: What you need to know about the deadly outbreak

In the meantime, a lot of questions remain about a serum has affected Brantly, who arrived at Emory University Hospital on Saturday. Dr. Brantly received a second dose of experimental treatment since his arrival at Emory and has improved, NBC News reports.

"It's been shown to work in primates, but this is the first time it's been used on human beings," said Dr. Nancy Snyderman of NBC News.

The serum is called Z-Mapp and is manufactured by Mapp Biopharmaceutical in San Diego.

"Because Dr. Brantly started to do poorly, he was given a dose of the serum, stabilized, and was able to make the trip," Snyderman said.

Once Writebol joins Brantly on American soil, many believe the hardest part will be over.

"Only health care workers who are taking care of him are at risk, and they're taking every precaution not to have any problems," Snyderman said.

The virus has killed more than 800 already in west African countries. All medical officials have said Writebol and Brantly will have far better treatment on American soil.

Complete Ebola Coverage:

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