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363165

IDENTIFICATION AND CHARACTERIZATION OF THE CURRENTLY CIRCULATING RABBIT HEMORRHAGIC DISEASE VIRUS ISOLATES

Article

Last updated: 28 Dec 2024

Subjects

-

Tags

Avian / Rabbit diseases

Abstract

Even among vaccinated rabbits, the virus that causes rabbit viral hemorrhagic disease (RHDV) has been increasing in Egypt recently. So, the current study screened the emergent RHDV of vaccinated and unvaccinated domestic rabbits in some Egyptian provinces between 2022 and 2023. 40 pooled Samples were collected from different rabbit flocks with age range of 2 months up to 4 months with high mortality rates, clinical symptoms, and post-mortem lesions related to RHDV. Hemagglutination (HA) test, reverse transcriptase-polymerase chain reaction (RT-PCR) targeting the partial VP60 and sequencing and phylogenetic analysis were conducted for genotyping of RHDV strains. The results revealed that 16 out of 40 cases that were positive for RHDV and were hemagglu­tinin-positive, with titer ranging from 23 to 214. Randomly six isolates were selected for genetic sequence and phylogenetic analysis which revealed their clustering with RHDV2 strains which were detected for the first time in Upper Egypt and submitted on GenBank as (OQ925947 Assiut .vac1 to OQ925952Assiut .vac6). The nucleotide sequence identities of the six isolates were 98.8-100 % compared to each other. The recently isolated strains had nucleotide difference 23, 1 % when compared to commonly vaccinal strain (JQ995154Giza 2006). The inoculated rabbits expressed RHDV-typical signs and postmortem findings and Ninety percent (90 %) mortality rate was recorded within3–6 days post-infection. Microscopic examination revealed that presence of acute necrotizing hepatitis, congestion and widespread hemorrhages in all internal organs; liver, lungs, spleen, kidneys and brain. In conclusion, the presence of RHDV-2 strains was detected for the first time in some Upper Egypt provinces.

DOI

10.21608/avmj.2024.278581.1237

Keywords

RHDV2, RT-PCR, VP60, Sequencing, histopathology

Authors

First Name

DOHA

Last Name

AHMED

MiddleName

ABD ALRAHMAN

Affiliation

Avian and Rabbit Medicine Department, Faculty of Veterinary Medicine, Assiut University, Egypt.

Email

dohaabdalrahman780@gmail.com

City

Assiut

Orcid

-

First Name

SAMAH

Last Name

ALI ABODALAL

MiddleName

EL SAYED

Affiliation

Department of Poultry Viral Vaccines, Veterinary Serum and Vaccine Research Institute (VSVRI), Agricultural Research Center (ARC), Cairo 11381, Egypt.

Email

drsamahsaidvet@gmail.com

City

-

Orcid

-

First Name

MOSTAFA

Last Name

SAIFELDIN

MiddleName

-

Affiliation

Avian and Rabbit Medicine Department, Faculty of Veterinary Medicine, Assiut University, Egypt

Email

mostafa.abdelgalil@vet.au.edu.eg

City

Assiut

Orcid

-

First Name

RAGAB

Last Name

IBRAHIM

MiddleName

S.

Affiliation

Avian and Rabbit Medicine Department, Faculty of Veterinary Medicine, Assiut University, Egypt

Email

ragab.ali@vet.au.edu.eg

City

-

Orcid

-

First Name

OMAR

Last Name

AMEN

MiddleName

-

Affiliation

Avian and Rabbit Medicine Department, Faculty of Veterinary Medicine, Assiut University, Egypt

Email

omarkamel83@vet.au.edu.eg

City

Assiut

Orcid

-

Volume

70

Article Issue

182

Related Issue

48831

Issue Date

2024-07-01

Receive Date

2024-03-23

Publish Date

2024-07-01

Page Start

160

Page End

177

Print ISSN

1012-5973

Online ISSN

2314-5226

Link

https://avmj.journals.ekb.eg/article_363165.html

Detail API

https://avmj.journals.ekb.eg/service?article_code=363165

Order

13

Type

Research article

Type Code

1,840

Publication Type

Journal

Publication Title

Assiut Veterinary Medical Journal

Publication Link

https://avmj.journals.ekb.eg/

MainTitle

IDENTIFICATION AND CHARACTERIZATION OF THE CURRENTLY CIRCULATING RABBIT HEMORRHAGIC DISEASE VIRUS ISOLATES

Details

Type

Article

Created At

28 Dec 2024