Retrospective epidemiological review on L. pneumophyla

SUMMARY: During the first annual control on hospital infections, was observed a curious but explainable trend regardingevidence of Legionella pneumophyla isolated by water systems in numerous public and private nosocomialstructures.After first massive isolation of L. pneumophyla strains at the beginning, a considerable reduction of isolates wasnoted, due to a program based on control and surveillance of water supplies, with regards to the aspectatives.But, in these last years a recurrent presence of isolates of L. pneumophyla was noted, despite all procedures usedfor the control of these bacteria.