title: Nasal carriage of Staphylococcus aureus, including community-associated methicillin-resistant strains, in Queensland adults.
abstract: Community-associated methicillin-resistant Staphylococcus aureus (CA-MRSA) infections are emerging in southeast Queensland, Australia, but the incidence of carriage of CA-MRSA strains is unknown. The aim of this study was to assess the nasal carriage rate of S. aureus, including CA-MRSA strains, in the general adult population of southeast Queensland. 396 patients presenting to general practices in two Brisbane suburbs and 303 volunteers randomly selected from the electoral rolls in the same suburbs completed a medical questionnaire and had nasal swabs performed for S. aureus. All isolates of S. aureus underwent antibiotic susceptibility testing and single-nucleotide polymorphism (SNP) and binary typing, including determination of Panton-Valentine leukocidin (PVL). The nasal carriage rate of methicillin-susceptible S. aureus (MSSA) was 202/699 (28%), a rate similar to that found in other community-based nasal carriage studies. According to multivariate analysis, nasal carriage of S. aureus was associated with male sex, young adult age group and Caucasian ethnicity. Only two study isolates (one MSSA and one CA-MRSA) carried PVL. The nasal carriage rate of MRSA was low, at 5/699 (0.7%), and only two study participants (0.3%) had CA-MRSA strains. CA-MRSA is an emerging cause of infection in southeast Queensland, but as yet the incidence of carriage of CA-MRSA in the general community is low.
authors.affiliation: Infection Management Service, Princess Alexandra Hospital, Brisbane, Queensland, Australia. wendy_munckhof@health.qld.gov.au
authors.forename: W J
authors.initials: WJ
authors.lastname: Munckhof
authors.forename: G R
authors.initials: GR
authors.lastname: Nimmo
authors.forename: J M
authors.initials: JM
authors.lastname: Schooneveldt
authors.forename: S
authors.initials: S
authors.lastname: Schlebusch
authors.forename: A J
authors.initials: AJ
authors.lastname: Stephens
authors.forename: G
authors.initials: G
authors.lastname: Williams
authors.forename: F
authors.initials: F
authors.lastname: Huygens
authors.forename: P
authors.initials: P
authors.lastname: Giffard
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001427:Bacterial Toxins / Q000235:genetics; D015373:Bacterial Typing Techniques; D002353:Carrier State / Q000453:epidemiology* / Q000382:microbiology*; D017714:Community-Acquired Infections / Q000453:epidemiology* / Q000382:microbiology*; D016172:DNA Fingerprinting; D005098:Exotoxins / Q000235:genetics; D005260:Female; D005838:Genotype; D006801:Humans; D015994:Incidence; D007956:Leukocidins / Q000235:genetics; D008297:Male; D055624:Methicillin-Resistant Staphylococcus aureus / Q000302:isolation & purification; D008826:Microbial Sensitivity Tests; D008875:Middle Aged; D009666:Nose / Q000382:microbiology*; D020641:Polymorphism, Single Nucleotide; D011793:Queensland / Q000453:epidemiology; D012307:Risk Factors; D013203:Staphylococcal Infections / Q000453:epidemiology* / Q000382:microbiology; D013211:Staphylococcus aureus / Q000302:isolation & purification*; D055815:Young Adult
chemical_list: D001427:Bacterial Toxins; D005098:Exotoxins; D007956:Leukocidins; C078284:Panton-Valentine leukocidin