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J Am Dent Assoc, Vol 126, No 5, 603-608.
© 1995 American Dental Association
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Journal of the American Dental Association, Vol 126, Issue 5, 603-608
Copyright © 1995 by American Dental Association

RESEARCH

Detecting Legionella pneumophila in water systems: a comparison of various dental units



SJ Challacombe and LL Fernandes
Department of Oral Medicine and Pathology, United Medical School, University of London.

The authors sampled 194 dental units over a 44-month period to detect the presence of Legionella pneumophila. They found L. pneumophila, usually in very low numbers, in 25 percent of the units over this time. However, higher counts were collected from 4 percent of the units, primarily from one model. The authors document colony counts collected from nine different models and those collected from air/water syringes vs. high-speed outlets, and they describe the effectiveness of disinfection.


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