Taken from Pathogenesis of Acute Viral Disease Induced in
Fish by Carp Interstitial Nephritis and Gill
Necrosis Virus
https://www.researchgate.net/publica...Necrosis_Virus
"Localization of the virus within white blood cells raises the
intriguing possibility that the virus is rapidly transferred to the
viscera via infected white blood cells. The virus can then multiply
in the kidney and infect the epithelial cells there. Another
important question is whether the virus resides in the gills.
Despite the technical difficulties mentioned above, the large
amounts of virus in this organ suggest that the virus can multiply
in the gills. It can then be released into the water either
through shedding or together with the sloughed epithelial and
inflammatory cells resulting from severe local inflammation.
The ability to invade the fish through the gills, multiply there,
and then be released through the water is favorable for the
virus. This is analogous to respiratory viruses in mammals that
infect the respiratory epithelium, replicate there, and are
spread through air droplets and aerosol. This may turn out to
be the most common means of spreading of aquatic viruses."
I'm not so sure exactly what you guys mean by quarantine. There is quarantining to separate a sick fish because it is currently shedding viruses or bacteria that you don't want to spread. Then there is quarantining a new fish where hopefully (?), you get to induce a disease (?). So if you put a fish in a "5 star hotel" you call adequate quarantine, how is this going to happen? Do you really want to heat your quarantine to induce "KHV"? And what is the sensitivity of this test? Does anyone really know? Hardly anyone has the means of testing for anything, never mind KHV.
Certain viruses are unique to carp be it koi herpes virus, pox or whatever. It is safer to assume that these viruses are in all our koi be it latent or under control (suppressed by their immune system), and it is triggered by stressors and is bound to spread.
So is quarantining really just a stress test?
I'd say be kind to all our animals. Assume all koi are in a disease state (as suppose to latent) when coming from a dealer or pet store triggered by the stress of overcrowding, being transported and what not. Quarantining is not a stress test but is a place to for koi to relax and recover (that is if you have an adequate quarantine you consider 5-star). If not you might as well let them recover in your main pond which should not be overcrowded and a have pretty robust bio-filtration that can control and even kill these virus. Then if you don't have the later, why even buy anymore fish?
For me, and I think this is where KDH is coming from, I just want one pond, not two.