EFSA Journal (Aug 2023)

Species which may act as vectors or reservoirs of diseases covered by the Animal Health Law: Listed pathogens of fish

  • EFSA Panel on Animal Health and Welfare (AHAW),
  • Søren Saxmose Nielsen,
  • Julio Alvarez,
  • Dominique Bicout,
  • Paolo Calistri,
  • Elisabetta Canali,
  • Julian Ashley Drewe,
  • Bruno Garin‐Bastuji,
  • José Louis Gonzales Rojas,
  • Christian Gortazar Smith,
  • Mette Herskin,
  • Virginie Michel,
  • Miguel Angel Miranda Chueca,
  • Barbara Padalino,
  • Hans Spoolder,
  • Karl Ståhl,
  • Antonio Velarde,
  • Arvo Viltrop,
  • Christoph Winckler,
  • Isabelle Arzul,
  • Shetty Dharmaveer,
  • Niels Jørgen Olesen,
  • Morten Schiøtt,
  • Hilde Sindre,
  • David Stone,
  • Niccoló Vendramin,
  • Mariana Aires,
  • Inmaculada Aznar Asensio,
  • Sotiria‐Eleni Antoniou,
  • Fulvio Barizzone,
  • Sofie Dhollander,
  • Marzia Gnocchi,
  • Anna Eleonora Karagianni,
  • Linnea Lindgren Kero,
  • Irene Pilar Munoz Guajardo,
  • Alessia Rusina,
  • Helen Roberts

DOI
https://doi.org/10.2903/j.efsa.2023.8174
Journal volume & issue
Vol. 21, no. 8
pp. n/a – n/a

Abstract

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Abstract Vector or reservoir species of five fish diseases listed in the Animal Health Law were identified, based on evidence generated through an extensive literature review (ELR), to support a possible updating of Regulation (EU) 2018/1882. Fish species on or in which highly polymorphic region‐deleted infectious salmon anaemia virus (HPR∆ ISAV), Koi herpes virus (KHV), epizootic haematopoietic necrosis virus (EHNV), infectious haematopoietic necrosis virus (IHNV) or viral haemorrhagic septicaemia virus (VHSV) were detected, in the field or during experiments, were classified as reservoir species with different levels of certainty depending on the diagnostic tests used. Where experimental evidence indicated transmission of the pathogen from a studied species to another known susceptible species, the studied species was classified as a vector species. Although the quantification of the risk of spread of the pathogens by the vectors or reservoir species was not part of the terms or reference, such risks do exist for the vector species, since transmission from infected vector species to susceptible species was proven. Where evidence for transmission from infected fish was not found, these were defined as reservoirs. Nonetheless, the risk of the spread of the pathogens from infected reservoir species cannot be excluded. Evidence identifying conditions that may prevent transmission by vectors or reservoir fish species during transport was collected from scientific literature. For VHSV, IHNV or HPR∆ ISAV, it was concluded that under transport conditions at temperatures below 25°C, it is likely (66–90%) they will remain infective. Therefore, vector or reservoir species that may have been exposed to these pathogens in an affected area in the wild, aquaculture establishments or through water supply can possibly transmit VHSV, IHNV or HPR∆ ISAV into a non‐affected area when transported at a temperature below 25°C. The conclusion was the same for EHN and KHV; however, they are likely to remain infective under all transport temperatures.

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