Canned foods are most often prone to flat-sour spoilage due to contamination by either mesophilic or thermophilic aerobic
spore-formers. Inadequate heat processing is commonly responsible for flat-sour spoilage since spores of mesophilic bacteria
are moderately resistant to moist heat. Also Bacillus stearothermophilus is the typical species responsible for this type
of spoilage (1, 2). Bacillus coagulans ( Bacillus thermoacidurans , a soil organism) is frequently isolated from flatsour
spoilage of canned tomato and dairy products. In flat-sour spoilage, carbohydrates are fermented with the production of
lower fatty acid