Ictalurid herpesvirus 2

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Ictalurid herpesvirus 2
Virus classification Edit this classification
(unranked): Virus
Realm: Duplodnaviria
Kingdom:
Heunggongvirae
Phylum: Peploviricota
Class: Herviviricetes
Order: Herpesvirales
Family: Alloherpesviridae
Genus:
Ictalurivirus
Species:
Ictalurid herpesvirus 2
Synonyms
  • IcHV-2
  • Black bullhead virus

Ictalurid herpesvirus 2 (IcHV-2) is a species of virus in the genus

Ictalurivirus, family Alloherpesviridae, and order Herpesvirales.[1]

Also known as the black bullhead virus, it is

clinical signs. IcHV2 has been experimentally observed to result in more severe clinical signs in channel catfish than IcHV1.[2]

Background

Ictalurid herpesvirus 2 was first observed in 1994 after two mass mortality events occurred in two different catfish farms in Italy, resulting in severe economic loss.[3]

As observed in experimental trials, there is a higher mortality rate in channel catfish when exposed to IcHV2 than in trials and previous background studies where channel catfish were exposed to IcHV1.[2] It is also shown that through syncytial cytopathic effect, both strains of Ictalurid herpesvirus are homologous to the syncytia produced.[3]

Genome

protein-coding regions with 12 open reading frames (ORFs) where these ORFs are seen to be homologous with every other Alloherpesvirus sequenced.[4] High synteny
between IcHV1 and IcHV2 was also observed.

Diagnosis

Detection of IcHV2 uses

quantitative PCR (qPCR) for any potential carriers or for checking for isolates. While IcHV2 was detected in all organs, the virus was seen the highest in the kidney and spleen; meanwhile, liver and gill concentrations were much lower.[5]

Other uses of qPCR can help detect IcHV2 in

morbidity
rates are from IcHV2 or another pathogen.

Pathology

Clinical signs of IcHV2 include disoriented swimming or instances where they dwell at the surface of the pond bank.

IcHV2 propagation control is a highly researched topic due to it showing much more intensive mortality rates in channel catfish than IcHV1. The high mortality rate is due to the fact that IcHV2 propagation and viral transmission has an optimal temperature of 24oC, which is relatively lower than IcHV1.[4] Furthermore, overcrowded pens contribute to the transmission of the virus.

References

  1. ^ "ICTV Master Species List 2018b.v2". International Committee on Taxonomy of Viruses (ICTV). Archived from the original on March 30, 2019. Retrieved 19 June 2019.
  2. ^
    ISSN 0177-5103
    .
  3. ^ , retrieved 2024-03-27
  4. ^ .
  5. ^ .

External links