I knew it had quit, but my husband was holding out on tossing it, so it sat alone in the incubator for a few days after it was already gone. The smell was bad, but not overwhelmingly strong. The incubator was new and the eggs were shipped. I hand turned the eggs, but I was vigilant about washing my hands before touching the eggs. I'm not sure exactly how an egg can get an infection, but I would like to know so that I can learn and take steps to possibly prevent it from happening again in the future. Thank you for taking a look for me. Very much appreciated.