I have been using Cpap for just over a month. I also had the flu about two weeks ago, thought about stopping the Cpap treatment. Doctors said to try to use the mask anyway. Seems that I did sleep much better with the mask on, although had to stop a couple times from coughing. Cleaned the mask, tubing and tank with soap and water and everything seems fine. Although we are done with the flu virus, the coughing is still present now and then.