Heart inflammation and piscine orthoreovirus genotype-1 in Pacific Canada Atlantic salmon net-pen farms: 2016-2019.

Autor: Polinski MP; Fisheries and Oceans, Canada Pacific Biological Station, 3190 Hammond Bay Road, Nanaimo, V9T6N7, Canada. mark.polinski1@usda.gov.; U.S. Department of Agriculture National Coldwater Marine Aquaculture Center, Portage Rd, Orono, ME, 04469, USA. mark.polinski1@usda.gov., Gross LA; Fisheries and Oceans, Canada Pacific Biological Station, 3190 Hammond Bay Road, Nanaimo, V9T6N7, Canada., Marty GD; Animal Health Centre, Ministry of Agriculture and Food, 1767 Angus Campbell Rd, Abbotsford, V3G2M3, Canada., Garver KA; Fisheries and Oceans, Canada Pacific Biological Station, 3190 Hammond Bay Road, Nanaimo, V9T6N7, Canada.
Jazyk: angličtina
Zdroj: BMC veterinary research [BMC Vet Res] 2022 Aug 10; Vol. 18 (1), pp. 306. Date of Electronic Publication: 2022 Aug 10.
DOI: 10.1186/s12917-022-03409-y
Abstrakt: Piscine orthoreovirus genotype-1 (PRV-1) is a virus commonly associated with Atlantic salmon aquaculture with global variability in prevalence and association with disease. From August 2016 to November 2019, 2,070 fish sampled at 64 Atlantic salmon net-pen farm sites during 302 sampling events from British Columbia, Canada, were screened for PRV-1 using real-time qPCR. Nearly all populations became PRV-1 positive within one year of seawater entry irrespective of location, time of stocking, or producer. Cohorts became infected between 100-300 days at sea in > 90% of repeatedly sampled sites and remained infected until harvest (typically 500-700 days at sea). Heart inflammation, which is sometimes attributed to PRV-1, was also assessed in 779 production mortalities from 47 cohorts with known PRV status. Mild heart inflammation was common in mortalities from both PRV + and PRV- populations (67% and 68% prevalence, respectively). Moderate and severe lymphoplasmacytic heart inflammation was rare (11% and 3% prevalence, respectively); however, mainly arose (66 of 77 occurrences) in populations with PRV-1. Detection of PRV-1 RNA was also accomplished in water and sediment for which methods are described. These data cumulatively identify that PRV-1 ubiquitously infects farmed Atlantic salmon in British Columbia during seawater production but only in rare instances correlates with heart inflammation.
(© 2022. The Author(s).)
Databáze: MEDLINE
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