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Table 2 Colonization percentages in residents from LTCFs of three Italian Provinces

From: Colonization of long-term care facility residents in three Italian Provinces by multidrug-resistant bacteria

  % of LTCF residents colonized with specific resistance phenotype and genotype and significant differences (p ≤ 0.05)
Milan (n = 104) Piacenza (n = 121) Bolzano (n = 115) Significant differences (p ≤ 0.05)
All resistance groups (MRSA; VRE; ESβL-/AmpC-producing enterobacteria; carbapenemase-producing enterobacteria, Pseudomonas aeruginosa and Acinetobacter baumannii) 75.0 69.4 66.1  
All ESβL-positive enterobacteria 60.5 66.1 53.0 P vs. B (0.04)
Escherichia coli, ESβL-positive 48.0 55.3 45.2  
  blaCTX-M-group-1 33.6 41.3 28.7 P vs. B (0.04)
  blaCTX-M-group-9 6.7 5.7 9.5  
  blaCTX-M-group, other than 1 or 9 4.8 9.9 0.0 P vs. B (< 0.001)
Proteus mirabilis, ESβL-positive 14.4 9.1 7.0  
  blaCTX-M-group-1 3.8 4.1 0.0 M vs. B (0.04); P vs. B (0.03)
  blaCTX-M-group-9 1.9 0.0 0.0  
Klebsiella pneumoniae, ESBL-positive 6.7 5.7 6.1  
  blaCTX-M-group-1 5.7 4.1 1.7  
  blaCTX-M-group-9 0.9 0.8 0.0  
  blaCTX-M-group, other than 1 or 9 0.0 0.0 2.7  
Morganella morganii, ESβL-positive 1.9 1.6 2.6  
Citrobacter koseri, ESβL-positive 0.0 3.3 0.8  
  blaCTX-M-group other than 1 or 9 0.0 3.3 0.0  
Enterobacter cloacae complex, ESβL-positive 0.9 0.8 0.0  
  blaCTX-M-group-1 0.0 0.8 0.0  
  blaCTX-M-group other than 1 or 9 0.9 0.0 0.0  
Serratia marcescens, ESβL-positive 0.0 0.8 0.0  
  blaCTX-M-group-1, blaCTX-M-15-like 0.0 0.8 0.0  
Providencia stuartii 1.9 0.0 0.0  
All high-level AmpC-positive enterobacteria 5.7 3.3 25.2 M vs. B (< 0.001); P vs. B (< 0.001)
Enterobacter cloacae complex, high-level AmpC 0.0 0.8 0.0  
Morganella morganii, high-level AmpC 3.8 0.8 24.3 M vs. B (< 0.001); P vs. B (< 0.001)
  blaDHA-type 3.8 0.8 8.7 P vs. B (0.004)
Citrobacter freundii, high-level AmpC 0.0 0.8 0.0  
Proteus mirabilis, high-level AmpC 1.9 0.0 0.8  
  blaCMY-type 0.0 0.0 0.8  
Serratia marcescens, high-level AmpC 0.0 0.8 0.0  
Providencia rustigianii, high-level AmpC 0.9 0.0 0.0  
All carbapenemase-positive enterobacteria 7.6 0.0 1.6 M vs. P (0.002); M vs. B (0.03)
Klebsiella pneumoniae, blaKPC-type 6.7 0.0 0.0 M vs. P (0.004); M vs. B (0.05)
Escherichia coli, blaVIM-1 0.0 0.0 0.8  
Enterobacter cloacae complex, blaVIM-1 0.9 0.0 0.0  
Citrobacter amalonaticus, blaVIM-1 0.0 0.0 0.8  
Carbapenemase-positive Pseudomonas aeruginosa 0.0 1.6 0.0  
blaVIM-type 0.0 0.8 0.0  
blaGES-5 0.0 0.8 0.0  
Carbapenemase-positive Acinetobacter baumannii 1.9 5.8 0.0 P vs. B (0.009)
blaOXA-23-like 1.9 5.8 0.0 P vs. B (0.009)
MRSA 24.0 5.7 14.8 M vs. P (< 0.001); P vs. B (0.02)
VRE 20.2a 0.8a 0.8b M vs. P (< 0.001); M vs. B (< 0.001)
  1. Notes: aEnterococcus faecalis; bEnterococcus faecium