Development of diagnostic assays for differentiation of atypical Aeromonas salmonicida vapA type V and type VI in ballan wrasse (Labrus bergylta, Ascanius).
J Fish Dis
; 44(6): 711-719, 2021 Jun.
Article
in En
| MEDLINE
| ID: mdl-33493378
Aeromonas salmonicida (As) is a highly heterogeneous bacterial species, and strains' host specificity has been reported. Ballan wrasse (Labrus bergylta Ascanius, 1767) is susceptible to atypical As (aAs) vapA type V and type VI in Scotland and Norway. Identification of the bacterium is achieved by culture and molecular techniques; however, the available methods used to distinguish the As types are costly and time-consuming. This paper describes the development of a PCR and a restriction enzyme assay for the detection of aAs vapA type V and type VI in ballan wrasse, respectively. Type V-specific primers were designed on conserved regions of the vapA gene, and the restriction enzyme assay was performed on the PCR products of the hypervariable region of vapA gene for the detection of type VI isolates. Amplification product was produced for type V (254 bp) and restriction bands (368 and 254 bp) for type VI isolates only. In addition, the assays detected type V and type VI isolates in spiked water samples and type V in diagnostic tissue samples. The assays are fast, specific and cost-effective and can be used as specific diagnostic tools for cleaner fish, to detect infectious divergence strains, and to manage and mitigate aAs disease outbreaks through vaccine development.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Restriction Mapping
/
Polymerase Chain Reaction
/
Gram-Negative Bacterial Infections
/
Aeromonas salmonicida
/
Disease Susceptibility
/
Fishes
/
Furunculosis
Type of study:
Diagnostic_studies
/
Prognostic_studies
Limits:
Animals
Country/Region as subject:
Europa
Language:
En
Journal:
J Fish Dis
Journal subject:
BIOLOGIA
/
MEDICINA VETERINARIA
Year:
2021
Document type:
Article
Country of publication: