Wound botulism is caused by toxin produced within a wound infected with Clostridium botulinum bacteria. For example, if soil containing botulism spores fell into an open wound, the spores could turn back into bacteria and produce toxins.
Infant botulism is caused by consuming the spores of botulism bacteria, which then grow in the intestines and release toxin. The reason you shouldn’t feed honey to an infant is because of the risk the honey might contain botulism spores.
All three forms of botulism can be life-threatening and should be treated as medical emergencies. Foodborne botulism is especially dangerous, because many people can be poisoned by eating from the same contaminated food source.