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The KHV is a herpes virus and the particularity of that virus familly is that once the level of the antibody is hight, the virus move and goes inside the lymphatics nodes ,the fish cannot contamine the others and he is not hill.
As soon as the level of the antibody decrease, often after a stress (shipping, difference of temperature, changement of food, breeding period ......) , the virus come out of the lymphatics nodes and the fish begin to be contagious again for the others, even if he doesn't show any sytmptom of the KHV.
In conclusion, less stress, less KHV expressions, but the virus is still hiden somewhere and ready to come back.
The only solution wood be to find a vaccination, but it is not easy and some time impossible to realise it.
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