dr. sanjay gupta says it looks like the whole thing was simply human error. >> well, fred, we're here at the cdc, tht the sight of this accide accidental, it seems accident alane by saying that either someone or a group of people messed up. some protocalls, some very important protocalls were not followed. what was supposed to happen as they were taking the bacteria from a high bio safety lab to a lower bio safety lab. two things were supposeded to happen. the anthrax bacteria were supposed to be inactivated and they were supposed to wait for 48 hours to make sure that in fact, the bacteria had been inactivated. neither one of those steps happened. it did not work properly and the bacteria were not watched for the 48 hours, so as a result, the live bacteria found its way into a lower bio safety lab, a lab that was not equipped to handle it and there's where the concern comes from. initially, 75 people were confirmed. they tried to figure out who was in the lab and when and security areas and stuff like that. they looked at the hallways, really trying to find out who may have come in contact with this bacteria. more people have come forward, yes, i may have be