Relist
Hence why I'm not bugging out to the South...
Seriously though, my 12 is
1.) Cholera
2.) Pneumonia
3.) Whooping cough
4.)Influenza (all of them)
5.) TB
6.) Typhoid Fever
7.) Typhus
8.) Bubonic plague
9.) AIDS/ HIV
10.) Measles
11.) Common cold
12.) Infections from wounds
The only one we won't have to worry about is obesity...
As I see it, some of those Dirty Dozen can be taken off due to general lack of possibility or just not deadly enough. I understand that even the tiniest of colds can kill a person in the right circumstance but lets take a closer look...
Cholera- Treatment includes eating food and drinking lots of water with with some electrolites (read salt) in it. Sure you'll be crapping in your pants

but I doubt that you'll die. If you understand what you have.
Pneumonia- Has so many causes; Bacteria, Viruses, Fungi, Parasites... you you might not know what is killing you. Could be the food you eat, the bag you tote, the items your carry. No vaccine=waiting to get better...
Whooping cough- Antibiotics dont work very well and usually will just limit duration slightly. Is everywhere but doesn't normally kill adults yet children are vulnerable. Epidemic status in both Pennsylvania and Washington State in April/May 2012

TB-Common and infectious. Not easily treated. Epedemic levels declared worldwide 1993 and again in 2006.
Typhoid Fever- Usually non-fatal even without vaccine. Spreads by insects, animals, and unsanitary conditions. Lasts up to four weeks.
Typhus- Kills appx 1 person per 5 million. Can be treated with antibiotcs.
Bubonic Plague- Kills 66% within 4 days. Spread by rodents. Treated with antibotics but screwed if you don't have any...
AIDS/HIV- People with are 30-50% more susceptible to other infections. If SHTF don't go pokin' around places you don't already know...
Measles- Currently only 3/1000 cases are fatal. Number is as high as 28% in poor countries. Has 90% infection rate on those living in the same space. No specific treatment.
So taking a closer look at this list we can narrow it down to the following.
1.)Pnemonia- common and proven killer in current and past times of hardship
2.)Whooping Cough- included only if you have children will usually not kill an adult.
3.)TB- common and highly contagious
4.)Plague- Only if you will be living in a urban cess-pool or fear biological attack.
5.)Measles- high infection rate and increased cases in places with poor healthcare.
6.)AIDS/HIV- If you get it or have it you'll be very susceptible to everything else. Those with high libido's be warned!

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7.) Malaria- Added to list due to high likelyhood and increasing fatality at younger ages.