The present invention relates to a recombinant KHV with a deficient ORF148/149, a recombinant KHV DNA encoding said KHV, a DIVA vaccine comprising said KHV and/or said DNA for preventing and/or treating disease caused by KHV in fish, such as Cyprinus carpio, a eukaryotic cell comprising said KHV and/or said DNA, a fish, such as Cyprinus carpio, vaccinated with said vaccine, and a method for preparing infectious particles of said KHV.