H7 bacteria genetically modified to produce some of the toxins made by "Clostridium perfringens" bacteria. AtsB is 48% similar to an enzyme present in "Clostridium perfringens". A strain of bacterium Clostridium perfringens has been found in Pattern III lesions. This deadly form of gangrene usually is caused by "Clostridium perfringens" bacteria. The suspected cause was "Clostridium perfringens". Some pathogenic bacteria, such as "Clostridium perfringens" and "Bacillus cereus", are capable of causing spoilage. The most common organisms are "Campylobacter", "Clostridium difficile", "Clostridium perfringens", and "Salmonella". With William Welch he identified Clostridium perfringens, the organism responsible for causing gangrene. Other less common pathogens include "Bacillus cereus, Clostridium perfringens, Clostridium difficile" and "Staphylococcus aureus". "Clostridium perfringens" produces two deadly toxins&colon; alpha-toxin and theta-toxin. "Clostridium perfringens" has been found in large numbers in the intestines of many affected dogs. The top five offenders were norovirus, "salmonella", "Clostridium perfringens", "Campylobacter" spp., and "Staphylococcus aureus".