I received an email from a relative (a forward of a forward) stating that onions attract and grow bacteria very quickly and that because of this, slicing an onion then consuming the leftovers a few days later (even if its been covered and refrigerated) can be harmful and make you ill due to how quickly they become contaminated.
I often only use half an onion and store the rest wrapped in plastic wrap in the fridge until I use it a few days later.
Is this claim accurate, should we not use onions long after they have been cut?
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