Bacteria may be present on products when you purchase them. Plastic-wrapped boneless chicken breasts and ground meat, for example, were once part of live chickens or cattle. Raw meat, poultry, seafood, and eggs are not sterile. Neither is produce such as lettuce, tomatoes, sprouts, and melons. Discard any cracked eggs.
Temperature is the best guide.
There are some other cooking guidelines that might be helpful as well. When egg mixtures are cooked on the stove top, if they coat a spoon, they are near endpoint temperature. In quiches, the appropriate endpoint temperature is assured if a knife inserted in the center comes out clean. Meringues should be cooked 15 minutes in a 350 degree oven. Keep milk, eggs, and other dairy products chilled at below 45 degrees F. Keep cooked milk, eggs and dairy products above 140 F. Keep cooked potatoes, beans and rice above 140 F. Store cooked potatoes, beans and rice below 45 F. Rinse whole melons before cutting.