title: Transmission of methicillin-resistant Staphylococcus aureus in the long term care facilities in Hong Kong.
abstract: BACKGROUND
  The relative contribution of long term care facilities (LTCFs) and hospitals in the transmission of methicillin-resistant Staphylococcus aureus (MRSA) is unknown.
  
  
  METHODS
  Concurrent MRSA screening and spa type analysis was performed in LTCFs and their network hospitals to estimate the rate of MRSA acquisition among residents during their stay in LTCFs and hospitals, by colonization pressure and MRSA transmission calculations.
  
  
  RESULTS
  In 40 LTCFs, 436 (21.6%) of 2020 residents were identified as 'MRSA-positive'. The incidence of MRSA transmission per 1000-colonization-days among the residents during their stay in LTCFs and hospitals were 309 and 113 respectively, while the colonization pressure in LTCFs and hospitals were 210 and 185 per 1000-patient-days respectively. MRSA spa type t1081 was the most commonly isolated linage in both LTCF residents (76/121, 62.8%) and hospitalized patients (51/87, 58.6%), while type t4677 was significantly associated with LTCF residents (24/121, 19.8%) compared with hospitalized patients (3/87, 3.4%) (p<0.001). This suggested continuous transmission of MRSA t4677 among LTCF residents. Also, an inverse linear relationship between MRSA prevalence in LTCFs and the average living area per LTCF resident was observed (Pearson correlation -0.443, p=0.004), with the odds of patients acquiring MRSA reduced by a factor of 0.90 for each 10 square feet increase in living area.
  
  
  CONCLUSIONS
  Our data suggest that MRSA transmission was more serious in LTCFs than in hospitals. Infection control should be focused on LTCFs in order to reduce the burden of MRSA carriers in healthcare settings.
authors: Department of Microbiology, Queen Mary Hospital, Hong Kong Special Administrative Region, China.
authors: Vincent C C
authors: VC
authors: Cheng
authors: Josepha W M
authors: JW
authors: Tai
authors: Zoie S Y
authors: ZS
authors: Wong
authors: Jonathan H K
authors: JH
authors: Chen
authors: Kris B Q
authors: KB
authors: Pan
authors: Yizchen
authors: Y
authors: Hai
authors: Wing-Chun
authors: WC
authors: Ng
authors: Denise M K
authors: DM
authors: Chow
authors: Miranda C Y
authors: MC
authors: Yau
authors: Jasper F W
authors: JF
authors: Chan
authors: Sally C Y
authors: SC
authors: Wong
authors: Herman
authors: H
authors: Tse
authors: Sophia S C
authors: SS
authors: Chan
authors: Kwok-Leung
authors: KL
authors: Tsui
authors: Felix H W
authors: FH
authors: Chan
authors: Pak-Leung
authors: PL
authors: Ho
authors: Kwok-Yung
authors: KY
authors: Yuen
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006268:Health Facilities; D006723:Hong Kong / Q000453:epidemiology; D006801:Humans; D008134:Long-Term Care; D008297:Male; D055624:Methicillin-Resistant Staphylococcus aureus / Q000145:classification / Q000235:genetics / Q000302:isolation & purification*; D008875:Middle Aged; D058889:Molecular Typing; D011446:Prospective Studies; D013203:Staphylococcal Infections / Q000453:epidemiology* / Q000382:microbiology / Q000635:transmission*; D013205:Staphylococcal Protein A / Q000235:genetics
chemical_list: D013205:Staphylococcal Protein A
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