Isolation and Genetic Characterization of Streptococcus iniae Virulence Factors in Adriatic Sturgeon (Acipenser naccarii)

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Colussi, Silvia and Pastorino, Paolo and Mugetti, Davide and Antuofermo, Elisabetta and Sciuto, Simona and Esposito, Giuseppe and Polinas, Marta and Tomasoni, Mattia and Burrai, Giovanni Pietro and Fernández-Garayzábal Fernández, José Francisco and Acutis, Pier Luigi and Pedron, Claudio and Prearo, Marino (2022) Isolation and Genetic Characterization of Streptococcus iniae Virulence Factors in Adriatic Sturgeon (Acipenser naccarii). Microorganisms, 10 (5). p. 883. ISSN 2076-2607

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Official URL: https://doi.org/10.3390/microorganisms10050883




Abstract

The first case of infection of Streptococcus iniae in Adriatic sturgeon (Acipenser naccarii) was recently reported in a raceway system located in Northern Italy. A second episode of infection in sturgeons with absence of mortality and evident clinical signs, was registered in November 2020 in the same farm and is reported in this study. Histopathological changes observed in infected organs are described. The strains isolated in the two episodes were compared using molecular analysis based on PCR, phylogeny and virulence factors analysis. Not all the major virulence factors were detected for the two strains; in particular the strains 78697, isolated in November, lacks cpsD, compared to the strains 64844, isolated in September. Moreover, genetic variations were reported for lctO and pmg genes. These findings let us hypothesize a different virulence of the strains in accordance with clinical findings related to the sturgeons.


Item Type:Article
Uncontrolled Keywords:bacterial diseases; streptococcosis; Acipenseridae; virulence factors
Subjects:Medical sciences > Veterinary
Medical sciences > Veterinary > Fish-culture
ID Code:73915
Deposited On:20 Jul 2022 13:42
Last Modified:03 Aug 2022 07:36

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