Don't eat raw protein food like fish, fowl, meat, milk, or eggs. Avoid sushi, oysters on the half shell, Caesar salad made with raw eggs, and unpasteurized eggnog. Don't use cracked eggs. Raw food can harbor bacteria. Heat or chill raw food.
Complete cooking is the only way to ensure that all potentially harmful bacteria have been killed.
Use a meat thermometer, especially when microwaving large meat and fowl. This also ensures that they are cooked thoroughly. Don't taste test the raw pork sausage stew, the fish chowder, or even the cookie batter before it's done. Don't let raw meat juice drip onto other food. It can taint otherwise harmless food.