According to the American Journal of Epidemiology, microwaving food is not as good as reheating in the oven or a frying pan.

That information comes from the Epidemic Intelligence Service of the U.S. Centers for Disease Control and Prevention in Atlanta, which was tracing an outbreak of salmonella typhimurium in Alaska.

Researchers found that all of the people who became sick had been to the same picnic, and had taken home leftovers. But while 30 people had taken home doggie bags, only 10 became sick. According to the CDC, all who became sick had reheated their food in a microwave oven. Those who didn’t become sick had used a conventional oven or frying pan.