Botulism danger highlighted in home‑preserved tomatoes and opened canned foods

A professional chef warns that storing dried tomatoes covered in oil at room temperature creates an anaerobic environment where *Clostridium botulinum* can produce deadly botulinum toxin. Safe preservation requires adding acid (such as white wine vinegar or lemon juice), ensuring proper acidity, and keeping the jars refrigerated.

Similarly, food‑safety guidelines advise that once a metal can is opened, its contents should be transferred to an airtight container and refrigerated at 4 °C or below. The metal can should not be stored directly in the fridge to avoid oxidation and potential off‑flavours. Consumers should also inspect cans for rust, bulging, or leakage before use, as these signs may indicate contamination.

Both pieces of advice aim to prevent botulism, a severe food‑borne illness, by controlling the conditions that allow the bacterium to thrive.