I work on vent and trach unit and I had noticed a lady was running a temp for 3 days and her lungs sound had a slight crackle to them. Well I knew she was getting something but when I went and told resp. she immediately said It was probably pneumonia. I am newly graduated and I am 98% that in school they said the first sign of pneumonia was abcent breath sounds. Can you explain what sound I would hear?