title: Clonal distribution of enterotoxigenic Staphylococcus aureus on handles of handheld shopping baskets in supermarkets.
abstract: OBJECTIVE
  Shopping carts and handheld shopping baskets in supermarkets are subject to accidental bacterial contamination through contacts with a variety of food. We investigated the prevalence of Staphylococcus aureus on the handles of handheld shopping baskets in four supermarkets distantly located in Osaka district, Japan.
  
  
  RESULTS
  Fifty two strains of Staph. aureus were isolated from 760 basket handles. Among these, six strains were positive for staphylococcal enterotoxin B (SEB) production, representing 12% of total. This SEB producer ratio is considerably higher than among Staph. aureus isolated from nasal swabs of the supermarket workers (2%) and from independently collected clinical specimens (4%). These SEB-producing Staph. aureus strains from the basket handles are clonal and belong to ST12. Coagulase typing showed that they are in group VII, which is the most common cause of food poisoning in Japan. Biofilm assays indicated that SEB gene (seb)-positive strains including this clone produced a significantly higher amount of biofilm than seb-negative strains.
  
  
  CONCLUSIONS
  The frequent isolation of seb-positive Staph. aureus on shopping basket handles raises the possibility that they could be a hidden reservoir for Staph. aureus with a potential to cause food poisoning and draws attention to the importance of shopping basket sanitation.
authors.affiliation: Department of Bacteriology, Hiroshima University Graduate School of Biomedical Sciences, Hiroshima, Japan.
authors.forename: E
authors.initials: E
authors.lastname: Mizumachi
authors.forename: F
authors.initials: F
authors.lastname: Kato
authors.forename: J
authors.initials: J
authors.lastname: Hisatsune
authors.forename: K
authors.initials: K
authors.lastname: Tsuruda
authors.forename: Y
authors.initials: Y
authors.lastname: Uehara
authors.forename: H
authors.initials: H
authors.lastname: Seo
authors.forename: M
authors.initials: M
authors.lastname: Sugai
mesh_terms: D003030:Coagulase / Q000145:classification; D004768:Enterotoxins / Q000235:genetics*; D019649:Food Industry; D005516:Food Microbiology; D007564:Japan; D013211:Staphylococcus aureus / Q000145:classification / Q000235:genetics / Q000302:isolation & purification*
chemical_list: D003030:Coagulase; D004768:Enterotoxins; C031818:enterotoxin B, staphylococcal