The 4 Most Likely Ways You Can Die If the SHTF | Ready Nutrition: "The subject of survival in a long term disaster goes beyond having stockpiles of beans, bullets and band-aids. Those that do survive during a long term emergency will no doubt be tried and tested with a great many things. One of those trying scenarios is dealing with death.
Zombie attacks seem to be a prevalent theme for preppers to prepare for. In fact, the CDC has even posted a preparedness article on how to ward off zombie attacks. While I believe these zombies will likely take the form of substance abusers, mental patients, chronically ill or diseased, and desperate individuals whose basic needs have not been met, they will die out in the first few months of an onset of a major disaster, and there presence will rarely be an issue in a long term situation.
In reality, a majority of those that will die during a long-term disaster will be from illnesses brought on by acute respiratory infections due to cramped living conditions, poor water conditions (or lack of), or bacterial infections from wounds. If we survive a major disaster, America would become a third world country and the aftermath of such a scenario will be similar to those living in Africa, Ethiopia and India..."