Infection

There are several ways to become infected.

Once infected there is a constitution roll with difficultly dependent on the type of infection.

The Air
Unless you are wearing mouth protection, it is impossible to venture outside into the ash without being infected.

Every breath of ash, you must roll half or below your CON to resist infection (just don't do it man).

Blood
If you have blood to blood contact with an infected, there is a strong chance of infection.

Minor contact (a drop falling in a scratch):

CON or less.

Major contact (falling into a puddle of blood with a large wound)

Half your CON or less.

Ingestion
Eating infected meat will always infect you, unless cooked. When cooked you must roll less than half your CON.

Water w/ ash.

If the settled ash is filtered properly it can be drank safely. Otherwise it is the same as inhalation:

Half or less of your CON.

Food w/ ash

Half or less of your CON.

Water w/ blood.

If boiled you must roll your CON or less.

If not boiled you must roll half your CON or less.

Food w/ ash

If cleaned off properly you are safe.

If not you must roll half your CON or less.

Bites
One day after being bitten you must roll half your CON or less to resist infection.

If the wound is cleaned properly you can roll your CON or less.

If the affected limb has been amputated you get to roll 2xCON or less.

Scratches
One day after being scratched, you must roll your CON our less to resist infection.

If the wound is cleaned properly, you can roll 1.5xCON or less.

If the affected limb is amputated you get to roll 2xCON or less

Cleaning infected wounds
You need the following equipment to clean wounds succesfully, if you are using hot or sharp things you may injure yourself, but otherwise you have no limit to retrying until you run out of materials.

It uses half the dexterity stat or the medicine skill.

Boiled water (or alcohol) / Soap: Half or lower

Boiled water (or alcohol)  and soap / medkit / dis infectant: Equal or lower

Med kit and boiling water and soap / Doctors kit: Double or lower

Doctors kit and boiling water: Triple or lower

Amputation
Unless you have some sort of axe, you will want a hacksaw and something to stop the bleeding.