Abstract: Disposable test packs for monitoring the efficacy of steam or ethylene oxide sterilization cycles includes a fiber board housing for a biological indicator. The housing includes two end sections and a midsection. Each end section includes an outer tube and a longer inner tube. The open end of the outer tubes abut the opposing open ends of the midsection to define a seam or gap. The inner tube extends past the seam and telescopes into the midsection. The seam and the close tolerance between the inner tube and the midsection provide a tortuous path for the entry of sterilant into the interior of the housing. The tortuous path has a moisture absorbent surface and is dimensioned to promote intimate contact between the sterilant and the absorbent surface. A second path of entry is provided in the embodiment adapted for use in monitoring ethylene oxide sterilization processes only. A midsection can be made of a transparent, sterilant impermeable material to permit observation of the interior of the housing.

Abstract: A disposable test pack for monitoring the efficacy of steam or ethylene oxide sterilization cycles includes a fiber board housing for a bioligical indicator. The housing includes an outer tube and a shorter inner tube. The outer tube has upper and lower portions which define a seam or gap at their adjoining open ends. The inner tube extends past the seam and telescopes into the upper and lower portions. The seam and the close tolerance between the inner tube and the upper and lower portions of the outer tube provide a tortuous path for the entry of sterilant into the interior of the housing. The tortuous path has a moisture absorbent surface and is dimensioned to promote intimate contact between the sterilant and the absorbent surface. The exterior of the housing can be lined with foil to prevent sterilant from permeating the housing, thereby preventing entry of the steam by any path other than through the seam.