title: [Isolation, identification and drug sensitivity of Streptococcus iniae from hybrid sturgeons (Huso dauricus female x Acipenser schrencki male)].
abstract: OBJECTIVE
  Sturgeons were the important economic species in Beijing. In July 2012, continuous mortality of cultured hybrid sturgeons was occurred on a farm in Huairou.
  
  
  METHODS
  We isolated three pathogens from liver, kidney and spleen of the dying sturgeons with clinical symptoms, marked HRS12718L, HRS12718K and HRS12718S respectively. Then we analyzed theirs morphological, physiological and biochemical characteristics, and drug sensitivity. We also cloned and partially sequenced the 16S rDNA of strain HRS12718K. Moreover, we identified the pathogenic characteristic of strain HRS12718K by artificial infection.
  
  
  RESULTS
  The morphological, physiological and biochemical characteristics of three strains were consistent with that of Streptococcus iniae isolated from other fishes in China, and 16S rDNA sequence of the strain HRS12718K was more than 99.1% homology with that of Streptococcus iniae. The LD50 of the pathogen to hybrid sturgeon was 4.42 x 10(5) CFU/mL, and challenged sturgeons presented the similar signs as the natural infected sturgeons. In addition, the bacterium was sensitive to norfloxacin, enrofloxacin, neomycin sulfate, doxycyline hyclate and tetracycline hydrochloride, and was highly sensitive to enrofloxacin.
  
  
  CONCLUSIONS
  Streptococcus iniae was the pathogen to cultured hybrid sturgeons in Beijing area, and enrofloxacin can be used against the disease.
authors.forename: Xiaoliang
authors.initials: X
authors.lastname: Wang
authors.forename: Lipu
authors.initials: L
authors.lastname: Xu
authors.forename: Jingbo
authors.initials: J
authors.lastname: Wang
authors.forename: Shu
authors.initials: S
authors.lastname: Wang
authors.forename: Huan
authors.initials: H
authors.lastname: Cao
mesh_terms: D000818:Animals; D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D002681:China; D005260:Female; D005393:Fish Diseases / Q000235:genetics / Q000382:microbiology* / Q000401:mortality; D005399:Fishes / Q000235:genetics / Q000382:microbiology; D006824:Hybridization, Genetic; D008297:Male; D008969:Molecular Sequence Data; D010802:Phylogeny; D013290:Streptococcal Infections / Q000235:genetics / Q000382:microbiology / Q000401:mortality / Q000662:veterinary*; D013291:Streptococcus / Q000145:classification / Q000187:drug effects* / Q000235:genetics / Q000302:isolation & purification*
chemical_list: D000900:Anti-Bacterial Agents