In a routine month. Mount Sinai Hospital and Clinic in Los Angeles would expect one or two postoperative wound infections owing to contamination in surgery. But not one case has turned up in the last six months, and surgeons could feel the reason while they worked. Blowing gently down over them from the operating-room ceiling was a curtain of air that was 99.9% free of germs, including the deadly staph.
The air was made surgically pure by being pumped through a 7-ft. cube housing 72 small cylinders, each containing an ultraviolet arc. The cylinders...
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