0301 basic medicine Cyprinid herpesvirus Carps Dna virus infections Veterinary (miscellaneous) Carassius carassius Event (relativity) DNA Viruses Zoology 04 agricultural and veterinary sciences Aquatic Science Biology biology.organism_classification DNA Virus Infections Mass mortality Fish Diseases 03 medical and health sciences 030104 developmental biology Italy 040102 fisheries Crucian carp Animals 0401 agriculture, forestry, and fisheries