Isolation,Identification and Drug Resistance Analysis of Staphylococcus sciuri of Corydoras

To explore etiology characteristics of Staphylococcus sciuri, strain YDE0916 was isolated and identified from Corydoras by cultivation, biochemical identification, 16S rDNA gene PCR amplification and sequence analysis, and resistance analysis.The result showed this strain was gram-positive, serial, spore, without capsule.The physicochemical properties showed immobility, β-galactosidase-negative, VP reaction-negative, sugar and maltose-positive.The nucleotide sequence of 16S rDNA was 1 476 bp and its GenBank accession number was KP031644.This 16S rDNA showed 99% homology with Staphylococcus sciuri.Phylogenetic tree showed that strain YDE0916 and several Staphylococcus sciuri strains gathered into one cluster.So the strain was identified as Staphylococcus sciuri.The antibiotic sensitive test showed that strain YDE0916 was resistant to norfloxacin and bacitracin, and was highly sensitive to 22 kinds of drugs, such as minocycline, gentamicin and ampicillin.This study could provide a reference for identification and prevention of Staphylococcus sciuri.