I never really know what drives the selective memory of pro-FF pundits. Whether it is that they blindly swallow the PR output from the BCSFA, DFO or CFIA - who employ the same script writers; or that they don't know or follow the science; or that they have really bad memories. Maybe it's the kool-aid. But then they make unsupported claims and expect the rest of us to simply blindly believe their unsupported claims.
Anyways there have been numerous reported ISAv PCR so-termed "weak" positive results, numerous "weak" positive results that have been classified by CFIA/DFO as "false" positives, and numerous PRV results, as well.
Some of those results are summarized at
http://alexandramorton.typepad.com/...know-about-isa-virus-in-british-columbia.html and tables displayed below:
and more listed here:
http://alexandramorton.typepad.com/alexandra_morton/2012/04/more-isa-virus-test-results.html
Also from
http://blog.alexandramorton.ca/post/2011/12/what-we-know-about-isa-virus-in-british-columbia/
In 1999, North American ISAv isolates were found in Chilean coho salmon farms and the strong match suggested the virus had been introduced from the North Atlantic shortly before detection (Nylund et al. 2007). In 2007, the European strain ISAv appeared in Atlantic salmon farms in Chile and became highly virulent sweeping through the industry (Vike et al. 2009).
The ISAv HPR0 avirulent type is asymptomatic and cannot be cultured (McBeath et al. 2009) and so will never be “confirmed” according to Canadian regulation. As well, cell culture is less sensitive than PCR and unable to detect low levels of the virus (Devold et al. 2000).
Also reference:
https://www.theglobeandmail.com/new...lmon-for-decades-inquiry-told/article4247764/
http://www.metronews.ca/news/vancou...igns-of-salmon-virus-in-british-columbia.html