This is the only thing that makes any sense ^^^ I read that it has been mutating from host to host now and wondered if that was accounting for all the false negatives they were getting. I know there is a test that gives results in about 6 hours now, but they send samples to the CDC to make sure. Just thinking off the top of my head, most all the patients have been a match for one of the serum donors, except Mr. Duncan, so I wonder if there is any blood type that is more susceptible to this strain?