TABLE 3.

Analysis of risk factors for bloodstream infections caused by AmpC β-lactamase-producing K. pneumoniae isolates versus those caused by TEM- or SHV-related ESBL-producing K. pneumoniae isolates

Risk factorNo. (%) of patientsP
AmpC group (n = 27)ESBL group (n = 25)
Long hospital stay (>2 wk)11 (40.7)16 (64)0.093
Care in intensive care unit3 (11.1)5 (20)0.458
Central venous catheterization8 (29.6)8 (32)0.853
Indwelling urinary catheter7 (25.9)7 (28)0.866
Polymicrobial infection9 (33.3)2 (8)0.025
Invasive procedure within previous 72 h10 (37.0)4 (16)0.087
Neutropenia2 (7.4)5 (20)0.241
Postsurgical state4 (14.8)3 (12)1.000
Nosocomial infection26 (96.3)21 (84)0.183
Prior use of antibiotics21 (77.8)21 (84)0.729
    Broad-spectrum cephalosporins20 (74.1)18 (72)0.866
    Penicillins2 (7.4)6 (24)0.134
    Fluoroquinolones4 (14.8)2 (8)0.670
    Aminoglycosides15 (55.6)16 (64)0.535