<prompt> Answer this question truthfullyAccording to Fournier, what are the causes of gangrene?  <response>: <reason> Fournier gangrene is caused by mixed aerobic and anaerobic organisms which normally exist below the pelvic diaphragm in the perineum and genitalia. Fournier gangrene may be caused by the following organisms: Aerobic organismsMost common aerobic organisms are: Group A streptococcus Escherichia coli Klebsiella pneumoniae Staphylococcus aureusAnaerobic organismsMost common anaerobic organisms are:Bacteroides fragilisStreptococcus Enterococcus Corynebacterium Clostridium Pseudomonas proteus species Candida species Lactobacillus gasseri Less than quarter of cases of Fournier gangrene are idiopathic. 