The best advice I can give is that you, 1) work with your doctor to make sure that you are receiving optimum therapy for the chronic sinusitis and, 2) Be meticulous in cleansing your
CPAP tubing and adhere to recommendations regarding filter replacement, on a regular basis. Give special attention to the humidifier, as it can be any especially effective breeding ground for bacteria, fungi and other infectious agents. Finally, latex is a not uncommon allergen.