Lesions Induced in Seriola dumerili Following Exposure to Streptococcus dysgalactiae by Oral Treatment or Immersion

Seriola dumerili were infected experimentally with Streptococcus dysgalactiae by oral dosing or immersion. There was moderate mortality after immersion in water containing defined numbers of bacteria, regardless of the dose, whereas the effect on the oral challenge groups depended on the dose of bac...

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Bibliographic Details
Published in:Journal of comparative pathology 2010-11, Vol.143 (4), p.262-267
Main Authors: Hagiwara, H., Takano, R., Noguchi, N., Narita, M.
Format: Article
Language:English
Subjects:
Animals
fish
Fish Diseases - microbiology
Fish Diseases - pathology
Heart
Immersion
Immunohistochemistry
Infection
Inflammation
Inflammation - microbiology
Inflammation - pathology
Inflammation - veterinary
Mortality
Perciformes
Seriola dumerili
Streptococcal Infections - microbiology
Streptococcal Infections - pathology
Streptococcal Infections - veterinary
Streptococcus
Streptococcus dysgalactiae
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Summary:Seriola dumerili were infected experimentally with Streptococcus dysgalactiae by oral dosing or immersion. There was moderate mortality after immersion in water containing defined numbers of bacteria, regardless of the dose, whereas the effect on the oral challenge groups depended on the dose of bacteria administered. The characteristic lesions were microabscesses and/or pyogranulomatous inflammation of the caudal peduncle, pectoral and/or dorsal fin, heart and olfactory region. S. dysgalactiae antigen was found within necrotic foci at these sites. There was no difference in distribution of S. dysgalactiae antigen in fish that were exposed by oral or immersion challenge. There was no difference in antigen distribution when fish that died were compared with those that survived and were killed. Immersion exposure is therefore a more effective natural route of infection than oral challenge.
ISSN:0021-9975
1532-3129
DOI:10.1016/j.jcpa.2010.04.005