Type A is the most virulent. Tasting can produce death. Most prevalent in Western states. The organisms produces proteolytic enzymes which makes spoilage more easily detected. Organisms often found in marine or lake sediments so outbreaks often involve seafood.
Endospores are less heat resistant.
Nonproteolytic so spoilage isn't as easily detected. No problem with people over a year old. Treatment is largely supportive - antibiotics are useless. See which mice survive 11. Occasional cases of wound botulism occur.