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- Title
Case definition for clinical and subclinical bacterial kidney disease (BKD) in Atlantic Salmon ( Salmo salar L.) in New Brunswick, Canada.
- Authors
Boerlage, A S; Stryhn, H; Sanchez, J; Hammell, K L
- Abstract
Bacterial kidney disease ( BKD) is considered an important cause of loss in salmon aquaculture in Atlantic Canada. Causative agent of BKD is the Gram-positive bacteria Renibacterium salmoninarum. Infected salmon are often asymptomatic (subclinical infection), and the disease is considered chronic. One of the challenges in quantifying information from farm production and health records is the application of a standardized case definition. Case definitions for farm-level and cage-level clinical and subclinical BKD were developed using retrospective longitudinal data from aquaculture practices in New Brunswick, Canada, combining (i) industry records of weekly production data including mortalities, (ii) field observations for BKD using reports of veterinarians and/or fish health technicians, (iii) diagnostic submissions and test results and (iv) treatments used to control BKD. Case definitions were evaluated using veterinarians' expert judgements as reference standard. Eighty-nine and 66% of sites and fish groups, respectively, were associated with BKD at least once. For BKD present (subclinical or clinical), sensitivity and specificity of the case definition were 75-100% varying between event, fish group, site cycle and level (site pen). For clinical BKD, sensitivities were 29-64% and specificities 91-100%. Industry data can be used to develop sensitive case definitions.
- Subjects
CANADA; ATLANTIC salmon; BACTERIAL kidney disease (Fish disease); VETERINARY diagnosis; DIAGNOSIS of fish diseases; RENIBACTERIUM salmoninarum; AQUACULTURE; DISEASES
- Publication
Journal of Fish Diseases, 2017, Vol 40, Issue 3, p395
- ISSN
0140-7775
- Publication type
Article
- DOI
10.1111/jfd.12521