Botulinum bacteria, as was stated above, require anaerobic, moist conditions to flourish. That being said, the spores (little shell encased bacteria) can survive in raw honey. As infant digestive tracts aren't fully developed, those spores can activate in an infant's gut, and produce the toxin.
Botulinum bacteria are commonly found in soils throughout the world. Improperly cooked, and canned foods can allow them to grow in foods. For those infused oils, the herbs must be heated high enough to kill the bacteria before adding to the oil. Same with peppers, and, mushrooms used to infuse flavors into oils.
Dried meats are exposed to air, and oxygen. This inhibits the growth of the bacteria. Also, the meat is dried, and usually salted, which again protects against any kind of pathogens.
Ok, I've now repeated what the others have said
. I hope I added something useful.
Seeeeya; Chief Longwind of the North