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Picnic Safety
In medical school, we learned that when a patient comes in with a "stomach flu" or Montezuma's Revenge, we should ask about whether the patient had been to a picnic or eaten off of a buffet recently. This is because bacteria don't tolerate heat over about 160°F or less than about 38°F. Unfortunately, most people who bring dishes to picnics or pot luck suppers (and many restaurants with buffets) don't think too much about how happy bacteria is between these temperatures--especially at room temperature.
While the temperature plays the key role here, the type of food sitting out is also important. Richer foods that have a more neutral acid content (like mayonnaise, sour cream, cheese sauces, etc.) are good breeding grounds for bacteria. This doesn't mean that you are completely protected by eating the vinaigrette, however.
Any food that might be contaminated before it was cooked is suspect--chicken and eggs are two that the CDC cautions about, but other meats also require care.
Do your friends a favor and take along some ice packs to keep your delicious potato salad as cold as possible. Read More "The Health of It All..." Articles