MOLECULAR TECHNIQUES REVEAL HIGH PREVALENCE OF LEGIONELLA IN DENTAL UNITS

Legionella bacteria are ubiquitous in freshwater aquatic systems, and humans are infected by them primarily through inhalation of contaminat ed aerosols. This study analyzed a total of 47 water samples from dent al lines in private dental offices and university and hospital dental clinics for Legionella using the polymerase chain reaction, direct flu orescent antibody staining and culture techniques. The typical tempera ture of dental waterlines (23 C) combined with Legionella's ability to form biofilms, stagnation of the water in the lines and a low chlorin e residual all potentially create a unique niche for this microorganis m.