Thermophilic Acid Resistant Medium is recommended for the growth and detection of thermophilic acid resistant microorganisms. It supports the growth of thermophilic, acid resistant microorganisms such as Bacillus stearothermophilus and other Bacillus species like B.coagulans (B. thermoacidurans).These organisms cause flat-sour spoilage i.e acid production, but no gas in canned foods.