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Table 2 Association between colonisation with L. pneumophila sg 1 and reported cases of legionellosis

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
Total 16 40 56
  1. p = 0.03 according to the χ2 test.