We will obtain FLIR ONE thermal images within 4 hours of the subject's chest x-ray. We will also collect the following data: 1) chief complaint, 2) temporal artery temperature, 3) cutaneous temperature, 4) ambient temperature, 5) respiratory rate, 6) oxygen saturation, 7) chest x-ray results and relevant data, 8) discharge diagnosis, and 9) disposition. The vitals will be obtained at the time nearest to the chest x-ray.