If one left a "Pasteurized" flask of broth for a long time at room temperature,it would stay sterile forever,at least in principle.

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Quizplus · Accepted Answer

Even if the broth was initially sterile and the flask was properly sealed, over time there is still a possibility that spores or other microorganisms could enter the flask and contaminate the broth. Additionally, some microorganisms can survive pasteurization, so it is not a guarantee of permanent sterility.

If One Left a "Pasteurized" Flask of Broth for a Long