Journal Article Cyprinus carpio PCR CEV Case Reports Fish Proteins Koi sleepy disease Research Support, Non-U.S. Gov't Review Sanger sequencing annual killifish benign tumour carp oedema virus cell‐mediated cytotoxicity common carp complement cascade first cases fish immune response koi latent infection mass spectrometry pathogenic assemblage phylogenetic analysis qRT‐PCR senescence thymidine kinase tumour growth type I interferon pathway viral disease