Infection and pathology in Queensland grouper, Epinephelus lanceolatus, (Bloch), caused by exposure to Streptococcus agalactiae via different routes

Infection and pathology in Queensland grouper, Epinephelus lanceolatus, (Bloch), caused by exposure to Streptococcus agalactiae via different routes

© 2014 John Wiley & Sons Ltd.

Bibliographische Detailangaben
Veröffentlicht in:Journal of fish diseases. - 1998. - 38(2015), 12 vom: 12. Dez., Seite 1021-35
1. Verfasser: Delamare-Deboutteville, J (VerfasserIn)
Weitere Verfasser: Bowater, R, Condon, K, Reynolds, A, Fisk, A, Aviles, F, Barnes, A C
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2015
Zugriff auf das übergeordnete Werk:Journal of fish diseases
Schlagworte:Journal Article Research Support, Non-U.S. Gov't Epinephelus lanceolatus Streptococcus agalactiae bacteriology his-topathology immunohistochemistry polymerase chain reaction
Beschreibung
Zusammenfassung:© 2014 John Wiley & Sons Ltd.
Since 2007, 96 wild Queensland groupers, Epinephelus lanceolatus, (Bloch), have been found dead in NE Australia. In some cases, Streptococcus agalactiae (Group B Streptococcus, GBS) was isolated. At present, a GBS isolate from a wild grouper case was employed in experimental challenge trials in hatchery-reared Queensland grouper by different routes of exposure. Injection resulted in rapid development of clinical signs including bilateral exophthalmia, hyperaemic skin or fins and abnormal swimming. Death occurred in, and GBS was re-isolated from, 98% fish injected and was detected by PCR in brain, head kidney and spleen from all fish, regardless of challenge dose. Challenge by immersion resulted in lower morbidity with a clear dose response. Whilst infection was established via oral challenge by admixture with feed, no mortality occurred. Histology showed pathology consistent with GBS infection in organs examined from all injected fish, from fish challenged with medium and high doses by immersion, and from high-dose oral challenge. These experimental challenges demonstrated that GBS isolated from wild Queensland grouper reproduced disease in experimentally challenged fish and resulted in pathology that was consistent with that seen in wild Queensland grouper infected with S. agalactiae
Beschreibung:Date Completed 01.11.2016
Date Revised 30.09.2020
published: Print-Electronic
Citation Status MEDLINE
ISSN:1365-2761
DOI:10.1111/jfd.12273