STERIS Spordex® Biological Indicator coupons can be small discs of special filter paper, polyflex or stainless steel coupons inoculated with bacteria spores, either Bacillus atrophaeus (BA) for ethylene oxide and dry heat sterilization, or Geobacillus stearothermophilus (GS) for saturated steam or hydrogen peroxide vapor biodecontamination. Discs and coupons are either packaged in bulk or individually packaged in glassine or Tyvek®. Biological Indicators with known resistances and spore populations are available to ensure consistent biodecontamination monitoring.