Just what were the DI personnel trying to be quarantined from?  Since they seem to have been having a running battle with the hostiles for some time, could it be that they sharp pains somewhere on their bodies and then wriggle around the ground in pain and in some kind of fit? Mighten it be from small darts being shot at them?  Do you suppose they might of found a vaccine for the darts...the injections Kelvin and Desmond were taking all those years? I can just imagine that in some future episode the hostiles try to take down Claire and find she is immune to the darts effects, thus saving Aaron.