Microorganisms in heated nebulizers.

Out of 353 heated nebulizers in actual use which were cultured in the Peter Bent Brigham Hospital, 118 (33%) were found to be contaminated. Gram-negative organisms predominated with rare micrococci and fungi. A slow-growing Vibrio was also recovered from 4 nebulizers. Heating of nebulizers above 46 C resulted in significant reduction of contamination. Types of heated nebulizers also figured significantly in the rate of contamination found. Carefully considered recommendations for the care and use of respiratory therapy equipment must be instituted and enforced. Techniques for terminal disinfection of equipment, followed by sterilization should result in the issue of sterile equipment for each patient. Rules for maintenance of equipment at the bedside are also needed.