Dissemination of community-associated methicillin-resistant Staphylococcus aureus in a tertiary care hospital.

Abstract:

BACKGROUND:The epidemiology of methicillin-resistant Staphylococcus aureus (MRSA) was investigated at a tertiary care hospital, and relationship was made between the clinical and genetic definitions of community- and healthcare-associated MRSA. METHODS:Nonduplicate isolates of S. aureus were collected during 2004. Isolates were classified clinically as community-associated (CA) or healthcare-associated (HA). Molecular typing studies were performed on the isolates. RESULTS:Four hundred and two S. aureus isolates were collected, of which 281 (70%) were MRSA. By clinical definition, 58 (21%) were classified as CA-MRSA and 215 (77%) as HA-MRSA. Among CA-MRSA, 36 (62%) harbored a SCCmec type IV gene. None of the SCCmec type IV CA-MRSA expressed inducible clindamycin resistance (MLSBi). Among 57 HA-MRSA isolates, 31 (54.4%) harbored a SCCmec type IV gene; MLSBi present in 5 (16%). Type IV SCCmec MRSA were most often associated with skin and soft tissue infections (RR 3.34 95% CI 1.43, 7.8). USA300 was the most common genotype among both CA- and HA-MRSA. CONCLUSIONS:Community-associated MRSA is a prominent pathogen with its most common genotype, USA300, representing a significant proportion of CA- and HA-MRSA infections in our institution. Clinical definitions of CA- and HA- status do not correlate well with the genetic definitions, particularly for HA-MRSA.

journal_name

South Med J

journal_title

Southern medical journal

authors

Patel M,Hoesley CJ,Moser SA,Stamm AM,Baddley JW,Waites KB

doi

10.1097/SMJ.0b013e31815d3fce

subject

Has Abstract

pub_date

2008-01-01 00:00:00

pages

40-5

issue

1

eissn

0038-4348

issn

1541-8243

pii

00007611-200801000-00018

journal_volume

101

pub_type

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