title: Acute lymphadenitis with cellulitis caused by Staphylococcus lugdunensis.
abstract: Although coagulase-negative staphylococci (CNS) have been considered part of the resident flora on the human skin, Staphylococcus lugdunensis is an unusually virulent CNS and can cause many types of infection. We report a rare case of acute lymphadenitis with cellulitis in the right infraauricular region caused by S. lugdunensis. A 62-yr-old woman visited the Department of Otolaryngology of Busan Paik university hospital. She had a palpable mass and swelling in the right infraauricular region and complained of aggressive pain and a febrile sensation in the region for 5 days. On the suspicion of abscess with infection, percutaneous aspiration was performed and smooth, flat, white, opaque colonies grew on a blood agar plate as a pure culture. The biochemical test results showed the organism to be catalase positive, tube coagulase negative, ornithine decarboxylase positive, slide coagulase positive, and latex agglutination tests for coagulase positive. The API Staph Kit was used to identify the isolate to the species level as S. lugdunensis with a 64.6% probability (profile 6716152). We confirmed the species identification of this strain by 16S rDNA sequence analysis. The patient's clinical condition improved with appropriate antimicrobial therapy and pus drainage.
authors.affiliation: Department of Laboratory Medicine, College of Medicine, Inje University, Busan, Korea.
authors.forename: Jae Hyen
authors.initials: JH
authors.lastname: Kim
authors.forename: Ja Young
authors.initials: JY
authors.lastname: Lee
authors.forename: Hye Ran
authors.initials: HR
authors.lastname: Kim
authors.forename: Kyung Wook
authors.initials: KW
authors.lastname: Heo
authors.forename: Seong Kook
authors.initials: SK
authors.lastname: Park
authors.forename: Jeong Nyeo
authors.initials: JN
authors.lastname: Lee
authors.forename: Seong-Mi
authors.initials: SM
authors.lastname: Yu
authors.forename: Jeong Hwan
authors.initials: JH
authors.lastname: Shin
mesh_terms: D000208:Acute Disease; D002481:Cellulitis / Q000175:diagnosis* / Q000382:microbiology*; D004322:Drainage; D004431:Ear, External; D005260:Female; D006801:Humans; D008199:Lymphadenitis / Q000175:diagnosis* / Q000188:drug therapy / Q000382:microbiology*; D008826:Microbial Sensitivity Tests; D008875:Middle Aged; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D017422:Sequence Analysis, DNA; D013203:Staphylococcal Infections / Q000175:diagnosis* / Q000382:microbiology
chemical_list: D012336:RNA, Ribosomal, 16S