The best protection against KHV is to buy Koi fish that carry the Biosekoi label. Biosekoi fish are produced in closed facilities under strict rules and it is almost impossible for KHV to enter such a production system, unlike open fishponds where KHV can often occur. Also, Hazorea Aquatics owns a health certificate from their state ministry that their Biosekoi fish don’t have and aren’t carriers of the KHV virus.