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(CNN) – An American photographer being treated for Ebola in Nebraska has been given an experimental drug.
Ashoka Mukpo was in Liberia working with an NBC news crew when he was diagnosed with the disease. He was flown to the Nebraska Medical Center in Omaha, which has a biocontainment unit and had previously treated another American patient who eventually made a full recovery.
Dr. Angela Hewitt, who is treating Mukpo, says it is "too early to say" how he is responding to the experimental drug.
The experimental drug is called CMX001. "This is an antiviral medication that has been used in a number of other infections, and it interferes with viral development," says Dr. Phil Smith, who is also treating Mukpo.
Smith warns that sometimes patients diagnosed early on in the disease "don't look that sick," but later develop complications and more serious symptoms.
For more of our interview with Dr. Angela Hewitt and Dr. Phil Smith, check out the video above.