Home > Available Issues
Original Articles
Clinical and Microbiological Characteristics of Health¬care-Associated Infections in Community-Onset Kleb¬siella pneumoniae Bacteremia
Jeong-a Lee1,3, Cheol-In Kang1, Eun-Jeong Joo1, Young Eun Ha1, So Yeon Park1, Doo Ryeon Chung1, Kyong Ran Peck1, Nam Yong Lee2, and Jae-Hoon Song1
1Division of Infectious Diseases and 2Department of La¬boratory Medicine, Samsung Medical Center, Sung-kyunkwan University School of Medicine, Seoul; 3Divi¬sion of Infectious Disease, Hallym University Sacred Heart Hospital, Anyang, Korea
Vol.44 Num.2 (p56~61)
Background: Although healthcare-associated (HCA) Klebsiella pneumoniae bacteremia constitutes a significant proportion of community-onset infection cases, its clinical and microbiologic characteristics have yet to be described in detail. In this study, we sought to delineate the clinical differences between community-associated (CA) and HCA K. pneumoniae bacteremia.
Materials and methods: A total of 240 patients infected by community-onset K. pneumoniae bacteremia were included in this study, and the data from the patients with HCA K. pneumoniae bacteremia were compared to those with the CA bacteremia. Isolates were microbiologically characterized and serotyped using a PCR method.
Results: Of the total 240 patients infected with community-onset K. pneumoniae bac¬teremia, 140 (58.3%) were defined as HCA infection cases, and the remaining 100 patients were classified as CA infections. Multivariate analysis showed that use of percutaneous tubes, occurrence of a recent surgical operation, cases of pneumonia, neutropenia and solid tumor, and prior receipt of antibiotics were all significant factors associated with HCA bacteremia infection (all P<0.05). In terms of microbiologic characteristics, ciprofloxacin resistance (12.9% [18/140] vs. 4.0% [4/100], P=0.02) and extended-spectrum ?-lactamase production (12.1% [17/140] vs. 4.0% [4/100], P =0.03) were more common in HCA bacteremia than CA bacteremia, respectively. The K1 and K2 serotypes, which are considered virulent community strains, were observed to exist more frequently in CA bacteremia than in HCA bacteremia (34% [34/100] vs. 21.4% [30/140], P=0.03). The overall 30-day mortality of the study population was 17.5% (37/211), and there was a trend toward greater mortality in the HCA group than in the CA group (21.4% [27/126] vs. 11.8% [10/85]; P=0.07).
Conclusions: Patients infected with HCA bacteremia accounted for a substantial propor¬tion of all patients with community-onset K. pneumoniae bacteremia, and showed significantly different clinical and microbiological characteristics than those infected with CA bacteremia. HCA K. pneumoniae bacteremia represented a distinct subset of community-onset bacteremia characterized by antibiotic resistant pathogens, a finding which physicians should consider in providing optimal treatment of these cases.
Keywords : Klebsiella pneumoniae, Bacteremia, Community-Acquired Infections, Cephalosporin Resistance