Check internal temperature of food with a meat thermometer. Covering the food with foil will help keep it moist. Reheat food thoroughly to a temperature of 165 degrees F. or until hot and steaming. In a microwave, cover good and rotate so that it heats evenly and allow a minute or two for it to stand for a more thorough heating. Check your microwave's recommended times and power levels.
Inadequate heating can contribute to illness.
When in doubt about an item's food safety, throw it out.