The most important function of immune system is to defend the body from different disease causing pathogens. Whenever there is pathology in human body, immune system is activated to protect the vital tissues from harm.
The circumstances of their disappearances are all fascinating, and some, sadly, have never been found. One of the more high-profile missing persons cases of 2012 isn't actually a missing persons case at all. Katherine Jackson was reported as missing in late-July of 2012, by her nephew, Trent Jackson.
This is not the movie we are talking about. The film, which we are trying to trace has NO survivors. The final survivor out of the crew of ghosts, appears to have been left by the rescuers but as they drive away after apparently finding no trace of him, they find his body several miles away.