
Originally Posted by
Nystul
Symptoms of the flu are not directly due to the virus- the sore throat, aches, fever, etc are caused by your immune system to get rid of the virus. Your body is willing to strafe bomb the cells of your throat to kill off virally infected epithelial cells for the long term greater good. In a similar way, cells that are only moderately damaged tend to adopt the better safe than sorry philosophy and just go apoptotic. Typically cells can be replaced, so why risk a damaged cell when you don't have to? Sometimes the body goes overboard- when people die of the flu it is because the immune system goes too far and the fever/dehydration/etc result in death. In this case, the body ends up killing off more cells than it can replace in a timely manner, and you die.