Which physical characteristic of a can mandates discarding it unopened due to potential botulism risk?
Answer
Severe denting, especially on the seams.
Canned goods require inspection before opening because compromised integrity can lead to dangerous contamination, most notably botulism from Clostridium botulinum. While leaks or rust are immediate causes for concern, severe denting, particularly if it compromises the crimped seams where the can components join, presents a major risk. Seams are critical seals; damage here compromises the vacuum and may allow microorganisms, including tough spores, to enter the sterilized environment. Along with leaks and rusting, severe dents signal structural failure where the protective high-pressure processing barrier has been breached, thus making the contents highly suspect and requiring immediate disposal.
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