Controlling the spread of ISA
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1
The Norwegian Veterinary Institute, Norway
Infectious salmon anemia (ISA) is an important and costly infectious disease in the salmon industry, with between one and 20 outbreaks in Norway annually. ISA is listed both by OIE and EU as a notifiable disease. The disease may appear spontaneously in a primary outbreak, probably as the result of a low-virulent ISAV-HPR0 virus mutating into a virulent ISA virus, or it may spread through local epidemics, giving rise to secondary outbreaks. There is strong evidence that the virus transmit horizontally between fish farms. ISA is regarded as one of the most prominent threats to the salmon industry, and proper management to prevent transmission between farms is of paramount importance.
Here, we use data from 77 ISA outbreaks in Norway between 2003 and 2015 to identify tools to prevent transmission between farms, and to reduce an outbreaks epidemiological potential.
The most important control measure limiting ISA transmission is rapid culling of infected farms. Our results indicate that the probability of transmission to other farms increases with increased time period from ISA diagnosis to completed culling. Probability of transmission also increases with (high) biomass density in the surrounding area. An outbreak was estimated to enter the epidemic phase with a delay of slaughter (culling) of six months after disease diagnosis.
Keywords:
Infectious salmon anemia,
Salmon framing,
R0,
Transmission probability,
Disease Management
Conference:
AquaEpi I - 2016, Oslo, Norway, 20 Sep - 22 Sep, 2016.
Presentation Type:
Oral
Topic:
Aquatic Animal Epidemiology
Citation:
Qviller
L,
Lyngstad
TM,
Kristoffersen
AB,
Sindre
H and
Lillehaug
A
(2016). Controlling the spread of ISA.
Front. Vet. Sci.
Conference Abstract:
AquaEpi I - 2016.
doi: 10.3389/conf.FVETS.2016.02.00039
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Received:
30 May 2016;
Published Online:
14 Sep 2016.
*
Correspondence:
Dr. Lars Qviller, The Norwegian Veterinary Institute, Oslo, Norway, lars.qviller@vetinst.no