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Is it safe to eat food left out in the open?

Minimal handling of cooked food and using clean ingredients help, say experts

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A key hygiene rule requiring food to be kept hot - above 60 deg C - before eating, to prevent poisoning, has thrown up interesting questions.
How have generations of Singaporeans managed to survive common fare like Hainanese chicken rice, cai png (economy rice) and roasted meat, when some items like the chicken itself are left hanging outside for hours or even an entire day, without massive food poisoning events?
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