Previously, we discussed delayed incubation with regards to steam sterilized Self-Contained BI EZTest product (Spore News Vol. 10, No 4). Here, we address delayed incubation with a very different BI used in a different process: DriAmp for Dry Heat sterilization.
In the ‘Resistance Performance Tests’ section of the USP, it states to culture a biological indicator (BI) ‘‘within a noted time, not more than four hours’’ after the sterilization process(1). An issue arises where the end user is unable to culture the exposed BI within the 4-hour window. As alluded to previously, in those cases, is a delay of a day, two or a week acceptable between the time of exposure and culturing of the BI?
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