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.
Disappearing people in the U.S. In the U.S. alone there are reports of over 10,000,000 people going missing per year. Out of this figure 500,000 are never found. Some of these people are victims of crimes but some are just gone. Sometimes it is not one person that disappears but a group of people. A man and his wife were sleeping. in a motel on a trip across the country in 1959. When she woke up, he was no longer by her side and had vanished, never to be seen again.