From: Virulence of Legionella pneumophila strains isolated from hospital water system and healthcare-associated Legionnaires’ disease in Northern Italy between 2004 and 2009
HCFs with reported cases
HCFs without reported cases
Total
HCFs colonised with L. pneumophila sg 1 and other serogroup and species
11
15
26
HCFs colonised with L. pneumophila sg 2–14 and other species
5
25
30
16
40
56