(psst, here's the more useless part first...)
The number of cases of foodborne and infant botulism has changed little in recent years, but wound [based] botulism has increased because of the use of black-tar heroin, especially in California.
Botulism (not the heroin). That's the scary shit inside swollen canned food. Can be found in soil as well as certain infected wounds. It's the most potent neurotoxin on earth as well as a crucial ingredient to some crucial neurotransmitters in your body.
More here. Yummy.
I secretly long to be a biochemist, so I read stuff like this for fun.