Harrison's Internal Medicine Chapter 135. Gas Gangrene and Other Clostridial Infections Definition Bacteria of the genus Clostridium are gram-positive, spore-forming, obligate anaerobes that are ubiquitous in nature. There are 60 recognized species of clostridia, many of which are generally considered saprophytic. Some of these species are pathogenic for humans and animals, particularly under conditions of lowered oxidation-reduction potential. Infections associated with these organisms range from localized wound contamination to overwhelming systemic disease. The four major disease categories for which clostridia are responsible are intestinal disorders, suppurative deep-tissue infections, skin and soft tissue infections, and bacteremia. Toxins play a major role.
