title: Reclassification of phenotypically identified staphylococcus intermedius strains.
abstract: To reclassify phenotypically identified Staphylococcus intermedius strains, which might include true S. intermedius strains and novel species such as Staphylococcus pseudintermedius and Staphylococcus delphini, we analyzed molecular phylogenies and phenotypic characteristics of 117 S. intermedius group (SIG) strains tentatively identified as being S. intermedius by the Rapid ID32 Staph assay. From phylogenetic analyses of sodA and hsp60 sequences, the SIG strains were divided into three clusters, which belonged to S. pseudintermedius LMG 22219(T), S. intermedius ATCC 29663(T), and S. delphini LMG 22190(T). All the SIG strains from dogs, cats, and humans were identified as being S. pseudintermedius. The wild pigeon strains, except one, were identified as being S. intermedius, and strains from all domestic pigeons, one wild pigeon, horses, and a mink were identified as being S. delphini. In addition, a phylogenetic analysis of nuc genes revealed that S. delphini strains were divided into two clusters: one was the cluster (S. delphini group A) that belonged to S. delphini LMG 22190(T), and the other was the cluster (S. delphini group B) that was more related to S. pseudintermedius LMG 22219(T) than S. delphini LMG 22190(T). The DNA-DNA hybridization results showed that S. delphini group B strains were distinguished from S. delphini group A, S. intermedius, and S. pseudintermedius strains. S. intermedius is distinguishable from S. pseudintermedius or S. delphini by positive arginine dihydrolase and acid production from beta-gentiobiose and d-mannitol. However, phenotypical characteristics to differentiate S. delphini group A, S. delphini group B, and S. pseudintermedius were not found. In conclusion, SIG strains were reclassified into four clusters with three established and one probably novel species.
authors.affiliation: Department of Infection Control Science, Faculty of Medicine, Juntendo University, 2-1-1 Hongo, Bunkyo-ku, Tokyo 113-8421, Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Sasaki
authors.forename: Ken
authors.initials: K
authors.lastname: Kikuchi
authors.forename: Yoshikazu
authors.initials: Y
authors.lastname: Tanaka
authors.forename: Namiko
authors.initials: N
authors.lastname: Takahashi
authors.forename: Shinichi
authors.initials: S
authors.lastname: Kamata
authors.forename: Keiichi
authors.initials: K
authors.lastname: Hiramatsu
mesh_terms: D000820:Animal Diseases / Q000382:microbiology; D000818:Animals; D001426:Bacterial Proteins / Q000235:genetics; D015373:Bacterial Typing Techniques; D002415:Cats; D018834:Chaperonin 60 / Q000235:genetics; D016000:Cluster Analysis; D010856:Columbidae; D004269:DNA, Bacterial / Q000737:chemistry / Q000235:genetics*; D004187:Disaccharides / Q000378:metabolism; D004285:Dogs; D004720:Endonucleases / Q000235:genetics; D006736:Horses; D006801:Humans; D006867:Hydrolases / Q000032:analysis; D008353:Mannitol / Q000378:metabolism; D008836:Micrococcal Nuclease / Q000235:genetics; D008907:Mink; D009693:Nucleic Acid Hybridization; D010802:Phylogeny; D017422:Sequence Analysis, DNA; D013203:Staphylococcal Infections / Q000382:microbiology / Q000662:veterinary; D013210:Staphylococcus / Q000145:classification* / Q000235:genetics* / Q000302:isolation & purification / Q000378:metabolism; D013482:Superoxide Dismutase / Q000235:genetics
chemical_list: D001426:Bacterial Proteins; D018834:Chaperonin 60; D004269:DNA, Bacterial; D004187:Disaccharides; C074002:nuc protein, staphylococcus; D008353:Mannitol; C095500:SodA protein, Bacteria; D013482:Superoxide Dismutase; D006867:Hydrolases; D004720:Endonucleases; D008836:Micrococcal Nuclease; C019723:arginine deiminase; C100052:gentiobiose