Clostridial necrotizing enteritis (CNE) is a severe and potentially fatal type of food poisoning caused by a β-toxin of Clostridium perfringens, Type C. It occurs in some developing regions, particularly in New Guinea, where it is known as pig-bel. The disease was also documented in Germany following World War II, where it was called Darmbrand (literally "bowel fire," or bowel necrosis). The toxin is normally inactivated by certain proteolytic enzymes and by normal cooking, but when these protections are impeded by diverse factors, and high protein is consumed, the disease can emerge.

Sporadic and extremely rare cases occur in diabetics. In New Guinea, where people generally have low-protein diets apart from tribal feasts, a number of factors—diet and endemic helminth infections among them—compound to result in pig-bel.