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Table 4 Comparison of microbiological characteristic among clinical isolates of community-acquired (CA), healthcare-associated (HCA), and nosocomial K. pneumoniae bacteremia

From: Clinical characteristics, antimicrobial resistance and capsular types of community-acquired, healthcare-associated, and nosocomial Klebsiella pneumoniae bacteremia

Microbiological characteristics of isolates CA (n = 70) HCA (n = 102) Nosocomial (n = 165) p value
CA vs. HCA HCA vs. Nosocomial CA vs. Nosocomial
Capsular type K1 12 (17.1) 10 (9.8) 8 (4.8) 0.157 0.117 0.002
Capsular type K2 13 (18.6) 12 (11.8) 9 (5.5) 0.213 0.063 0.002
Capsular type K1 and K2 25 (35.7) 22 (21.6) 17 (10.3) 0.041 0.011 < 0.001
Capsular type K1, K2, K5, K20, K54, and K57 36 (51.4) 37 (36.3) 32 (19.4) 0.048 0.002 < 0.001
Isolates with both antimicrobial resistancea and capsular type K1, K2, K5, K20, K54, and K57 2 (2.9) 6 (5.9) 9 (5.5) 0.475 0.883 0.513
Isolated with both multidrug resistanceb and capsular type K1, K2, K5, K20, K54, and K57 2 (2.9) 3 (2.9) 7 (4.2) 1.000 0.746 1.000
Presence of plasmid rmpA 42 (60.0) 39 (38.2) 36 (21.8) 0.005 0.004 < 0.001
Presence of plasmid rmpA2 41 (58.6) 37 (36.3) 35 (21.2) 0.004 0.007 < 0.001
  1. aAntimicrobial resistance is defined as non-susceptibility to at least one antimicrobial agent in addition to ampicillin
  2. bMultidrug resistance is defined as non-susceptibility to at least one agent in three or more antimicrobial categories