alexa Recent trend of necrotizing fasciitis in Taiwan: focus on monomicrobial Klebsiella pneumoniae necrotizing fasciitis.
Microbiology

Microbiology

Clinical Microbiology: Open Access

Author(s): Cheng NC, Yu YC, Tai HC, Hsueh PR, Chang SC,

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Abstract BACKGROUND: Necrotizing fasciitis (NF) is a rapidly progressive, life-threatening soft-tissue infection that is traditionally caused by group A Streptococcus (GAS) or mixed aerobic/anaerobic bacteria. Monomicrobial Klebsiella pneumoniae NF (KP-NF) has been reported since 1996 but has not yet been systematically studied. METHODS: We retrospectively studied consecutive NF cases treated at a university hospital in Taiwan during 1997-2010 and investigated the clinical characteristics and outcomes associated with monomicrobial KP-NF, using monomicrobial GAS-NF as a reference. We also analyzed the virulence gene profiles of the isolated K. pneumoniae strains. RESULTS: Of 134 NF cases, 88 were monomicrobial, of which the most common pathogens were GAS (n = 16) and K. pneumoniae (n = 15). Monomicrobial KP-NF entailed a moderate risk of limb loss (20\% vs 25\%; P = 1.000) and high mortality (47\% vs 19\%; P = .135), and it was more likely to involve bacteremia (80\% vs 31\%; P = .011), concomitant distant abscesses (27\% vs 0\%; P = .043), and underlying immunocompromising conditions (100\% vs 63\%; P = .018), compared with GAS-NF. The isolated K. pneumoniae strains (n = 10) were of capsular polysaccharides genotype K1 (n = 4), K54/K20/K5 (n = 4), K2 (n = 1), and K16 (n = 1). All strains carried rmpA, iucABCDiutA, and iroA. Genotype K1 strains had a significantly higher risk of concomitant distant abscesses, compared with non-K1 strains (75\% vs 0\%; P = .033). CONCLUSIONS: K. pneumoniae has become a common pathogen of monomicrobial NF in Taiwan. Physicians treating patients with monomicrobial KP-NF should be aware of the risk of concomitant distant abscesses, particularly in cases caused by genotype K1. This article was published in Clin Infect Dis and referenced in Clinical Microbiology: Open Access

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