I need a bit of advice on the results I have obtained from my experiment.
So I conducted a microbiological challenge test also called PET/AET.
What i have observed is that there are no log reductions but the bacterial colonies (cfu/ml per plate) have still reduced. The log reductions are like 0.7 or 0.1, or 0.3 which is basically nothing.
Thus i am having hard time analysing results as I do not know whether the preservative system/product in question can be passed off as an effective antimicrobial or not
So how can this be possible ? has anyone else experienced this too