Duo-Spore Sterilization Biological Indicators

If you run an autoclave, dry heat unit, EO gas chamber, or chemical vapor sterilizer, you already know that a cycle looks the same whether it succeeded or failed. Biological indicators are how you prove sterility actually happened — by challenging the process with live bacterial spores and confirming they were killed. That's the job Duo-Spore does.

The Duo-Spore Sterilization Biological Indicator Strip (26906500) is a versatile spore strip engineered for use across all four major sterilization methods: steam, ethylene oxide gas, dry heat, and chemical vapor. That flexibility makes it a practical single-product solution for offices and facilities that run more than one sterilization modality and don't want to stock a different indicator for each. Each 4-inch strip carries the spore population that must be destroyed for a load to be considered sterile, with results available after a 48-hour incubation and read time.

A common question: how often should you use one? Most infection-control guidelines and accrediting bodies recommend weekly biological monitoring at minimum, with many dental and surgical practices testing every load that contains implantable items. The strip is placed in the most challenging area of the load, run through the cycle, then cultured to check for surviving growth — no growth means the process worked.

Store strips per the manufacturer's conditions, follow the stated 48-hour read window, and log every result to maintain a defensible sterilization record for inspections.

Explore related monitoring and cycle-documentation supplies such as Duo-Record, or browse the broader Duo family for complementary products.