Experimental Ebola drug ZMapp gets fast track status from FDA

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(CNN) -- ZMapp, an experimental drug that was given to the first American treated in the United States for Ebola, has been granted fast track approval by the FDA, according to LeafBio. LeafBio is the commercial arm of Mapp Biopharmaceutical, the makers of the drug.

A press release posted on the company website proclaimed this as an "important milestone" which brings them closer to eventually gaining FDA approval.

"We are gratified to receive this designation for ZMapp," said Dr. Kevin Whaley, CEO of LeafBio and Mapp. "We are hopeful that this step will accelerate access to ZMapp once safety and efficacy are demonstrated to FDA's satisfaction in ongoing clinical trials."

This is a change from the previous status as an orphan drug, which provided incentive for development of the drug financially and otherwise.

Brantly was the first human to receive the drug after becoming ill with the virus that has infected 28,256 people and killed 11,306 since March 2014.

He was working as a missionary in Liberia. His fellow missionary, Nancy Writebol, was also infected and was the second person to receive the experimental drug. Brantly was transported to Emory University hospital, where he was treated and declared Ebola-free, as was Writebol.

According to the National Institutes of Health, the drug was administered under emergency use authorization to nine infected patients in Africa, the United States and Western Europe as of February, when the NIH announced the first clinical trial of ZMapp in Liberia and the United States.

Doctors have said it is unclear whether the drug was accountable for patients' survival because it was not given within the context of a clinical trial. In addition, patients were cared for in other ways simultaneously.

The drug, produced using proteins that are first injected into tobacco plants, takes six months to produce and supply has been extremely limited. In October the Obama administration asked the three labs working on the drug to scale up production.