[Characterization of Listonella anguillarum as the aetiological agent of vibriosis occurred in cultured ayu (Plecoglossus altivelis) in Ninghai country, China].
Wei Sheng Wu Xue Bao
; 49(7): 931-7, 2009 Jul.
Article
em Zh
| MEDLINE
| ID: mdl-19873758
ABSTRACT
OBJECTIVE:
Ayu (Plecoglossus altivelis) vibriosis threatens ayu aquaculture seriously caused by mass mortality due to severe infections. We characterized the vibriosis pathogen of ayu in Ninghai country.METHODS:
A dominant strain was isolated and identified by a series of biochemical and physiological tests. The lethal dose 50% (LD50) was calculated by the modified Karber's method. PCR amplification and sequence analysis were used to further identify the pathogen.RESULTS:
LD50 of ayu-H080701 was 1.2 x 10(4) CFU to ayu. PCR amplification showed that the bacterial universal primers for 16S rRNA gene and the specific primers for the metalloprotease (MP) gene of Listonella anguillarum worked. 16S rRNA gene analysis showed that ayu-H080701 shared 99.4%-99.5% nucleotide identical to L. anguillarum isolates, while 94.3% and 91.9% nucleotide identical to L. pelagius and Photobacterium damselae respectively. Metalloprotease analysis showed that ayu- H080701 shared 97.6%-98.8% amino acid sequence identical to L. anguillarum isolates, while lower than 75.6 % to other bacteria. Phylogenetic analysis showed that ayu-H080701 grouped constantly with L. anguillarum isolates.CONCLUSION:
The biochemical, physiological tests and sequence analysis all strongly supported the identification of the pathogen causing ayu vibriosis in Ninghai country, China, as an isolate of L. anguillarum.
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Base de dados:
MEDLINE
Assunto principal:
Infecções por Bactérias Gram-Negativas
/
Osmeriformes
/
Listonella
/
Doenças dos Peixes
Tipo de estudo:
Etiology_studies
Limite:
Animals
País/Região como assunto:
Asia
Idioma:
Zh
Revista:
Wei Sheng Wu Xue Bao
Ano de publicação:
2009
Tipo de documento:
Article
País de afiliação:
China