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(CNN) – The death of a second Ebola patient in the U.S. is raising new concerns about the accuracy of tests used to detect the virus.
Dr. Martin Salia was a surgeon based in Maryland. He contracted Ebola while working with patients in his native Sierra Leone. He started showing symptoms ten days ago, but his initial tests came back negative, doctors in West Africa reportedly even cheered the test results and gave him a celebratory hug.
But when his health started to deteriorate, Salia was tested again. The second test came back positive, and Salia was flown out of West Africa to Omaha, where he received treatment at Nebraska Medical Center's state of the art biocontainment unit.
Doctors there say they gave it their all, but it wasn't enough.
"We really really gave it everything we could, all modern medical therapist was provided. We wish there could have been a different outcome, but I am also proud of the team for what they were able to try," said Dr. Daniel Johnson, division chief of critical care anesthesiology at the center.
What, if anything, went wrong with Salia's initial diagnosis and subsequent treatment?
Penn State University professor Gavin Macgregor-Skinner weighs in, in the video above.