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

Delamare-Deboutteville, J. and Bowater, R. and Condon, K. and Reynolds, A. and Fisk, A. and Aviles, F. and Barnes, A. C. (2015) Infection and pathology in Queensland grouper, Epinephelus lanceolatus, (Bloch), caused by exposure to Streptococcus agalactiae via different routes. Journal of Fish Diseases, 38 (12). pp. 1021-1035. ISSN 1365-2761

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Article Link(s): http://dx.doi.org/10.1111/jfd.12273

Abstract

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.

Item Type:Article
Business groups:Animal Science
Keywords:bacteriology Epinephelus lanceolatus his-topathology immunohistochemistry polymerase chain reaction Streptococcus agalactiae
Subjects:Veterinary medicine > Veterinary bacteriology
Veterinary medicine > Communicable diseases of animals (General)
Veterinary medicine > Veterinary pathology
Aquaculture and Fisheries > Fisheries > Fishery research
Deposited On:09 Feb 2016 01:54
Last Modified:06 Apr 2016 03:13

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