title: Association of staphylococcus cohnii subspecies urealyticum infection with recurrence of renal staghorn stone.
abstract: BACKGROUND
  Stphylococcus cohnii is an organism of coagulase negative species which is considered as normal flora. However, it has been isolated from urinary tract infections and surgical prostheses but its relation with staghorn stones has not been reported, yet.
  
  
  METHODS
  A 50-years-old woman presented with left renal staghorn stone in June 2014. She had bilateral staghorn stones 7 years ago. Staphylococcus cohnii subspecies urealyticum were detected from a removed stone. After 7 years, recurrence staghorn stone in her left kidney was diagnosed and patient underwent another surgery. The patient had several attacks of cystitis during these 7 years. The results of stone and urine cultures revealed staphylococcus cohnii subspecies urealyticum.
  
  
  CONCLUSIONS
  This case report emphasizes a possible association between staphylococcus cohnii subspecies urealyticum infection and recurrence renal staghhorn stone.
authors.affiliation: Paramedical Faculty, Babol University of Medical Sciences, Iran.
authors.forename: Zahra
authors.initials: Z
authors.lastname: Shahandeh
authors.affiliation: Department of Surgery, Shahid Beheshti Hospital, Babol University of Medical Sciences, Iran.
authors.forename: Hamid
authors.initials: H
authors.lastname: Shafi
authors.affiliation: Paramedical Faculty, Babol University of Medical Sciences, Iran.
authors.forename: Farahnaz
authors.initials: F
authors.lastname: Sadighian
keywords: Renal staghhorn stone; Staphylococcus cohnii subspecies urealyticum; UTI