“…Incidence of legionellosis has consistently and significantly risen since the discovery of the disease in 1976 (Fraser et al, 1997). The majority of cases of legionellosis are caused by exposure through the respiratory route, however, a range of atypical forms of the disease have been reported (Kilborn et al, 1992;McCabe et al, 1984;Yu, 1993). The two most common forms of illness caused by this pathogen are: Pontiac fever, resulting in flu like symptoms, and Legionnaires' disease, a potentially deadly pneumonia (Cordes and Fraser, 1980).…”