Abstract:Chicken Anemia Virus (CAV) is an extremely contagious immunosuppressive disease causing high economic losses in poultry production. In the present study, tissue samples (bone marrow, thymus, and spleen) were collected from 86 different broiler chicken farms located in fourteen governorates in Egypt during 2020. They suffered from retard growth, weakness, and a drop in egg production with an observed mortality rate ranged 5-15%. A total of 26 samples were positive for CAV using PCR in six governorates in Lower … Show more
“…DNA extraction from the examined tissue homogenates was performed utilizing the QIAamp DNA extraction kit (Qiagen, Germany, Cat. No 51304), Quality of extracted DNA was measured by Nabi Nanodrop spectrophotometer |(MicroDigital Co., Ltd., Korea) and DNA concentrations of positive samples were listed in ( Supplementary Table 1 ) to amplify a 675 bp DNA fragment of the Vp1 gene ( 21 ), the oligonucleotide primers 5’-GAC TGT AAG ATG GCA AGA CGA GCT C-3′ and 5’-GGC TGA AGG ATC CCT CAT TC-3′ were employed, spanning nucleotides from 823 to 1498, numbering is corresponding to the Del-Rose strain (GenBank AF313470) ( 3 ). The PCR assay was conducted using the Emerald Amp®GT PCR master mix (Cat No.…”
Section: Methodsmentioning
confidence: 99%
“…Consequently, numerous studies have reported the circulation of CAV in chicken farms among Egypt. Therefore many studies was done to molecular detect and characterize of CAV as a trail to control of CAV ( 3 ).…”
Chicken anemia virus (CAV) is a widespread and economically significant pathogen in the poultry industry. In this study 110 samples were collected from various poultry farms in selected Egyptian provinces during 2021–2022 and were tested against CAV by Polymerase Chain Reaction (PCR), revealing 22 positive samples with 20% incidence rate. Full sequence analysis of five selected CAV strains revealed genetic variations in VP1, VP2, and VP3 genes. Phylogenetic analysis grouped the Egyptian strains with reference viruses, mainly in group II, while vaccines like Del-Rose were categorized in group III. Recombination events were detected between an Egyptian strain (genotype II) and the Del-Rose vaccine strain (genotype III), indicating potential recombination between live vaccine strains and field isolates. To evaluate pathogenicity, one Egyptian isolate (F883-2022 CAV) and Del-Rose vaccine were tested in Specific Pathogen Free (SPF) chicks. Chicks in the positive group displayed clinical symptoms, including weakness and stunted growth, with postmortem findings consistent with CAV infection. The vaccine group showed milder symptoms and less severe postmortem changes. This study provides important insights into the genetic diversity of CAV in selected Egyptian poultry farms showing recombination event between field strain and vaccine strains, highlighting the need for advanced vaccination programs, especially for broilers.
“…DNA extraction from the examined tissue homogenates was performed utilizing the QIAamp DNA extraction kit (Qiagen, Germany, Cat. No 51304), Quality of extracted DNA was measured by Nabi Nanodrop spectrophotometer |(MicroDigital Co., Ltd., Korea) and DNA concentrations of positive samples were listed in ( Supplementary Table 1 ) to amplify a 675 bp DNA fragment of the Vp1 gene ( 21 ), the oligonucleotide primers 5’-GAC TGT AAG ATG GCA AGA CGA GCT C-3′ and 5’-GGC TGA AGG ATC CCT CAT TC-3′ were employed, spanning nucleotides from 823 to 1498, numbering is corresponding to the Del-Rose strain (GenBank AF313470) ( 3 ). The PCR assay was conducted using the Emerald Amp®GT PCR master mix (Cat No.…”
Section: Methodsmentioning
confidence: 99%
“…Consequently, numerous studies have reported the circulation of CAV in chicken farms among Egypt. Therefore many studies was done to molecular detect and characterize of CAV as a trail to control of CAV ( 3 ).…”
Chicken anemia virus (CAV) is a widespread and economically significant pathogen in the poultry industry. In this study 110 samples were collected from various poultry farms in selected Egyptian provinces during 2021–2022 and were tested against CAV by Polymerase Chain Reaction (PCR), revealing 22 positive samples with 20% incidence rate. Full sequence analysis of five selected CAV strains revealed genetic variations in VP1, VP2, and VP3 genes. Phylogenetic analysis grouped the Egyptian strains with reference viruses, mainly in group II, while vaccines like Del-Rose were categorized in group III. Recombination events were detected between an Egyptian strain (genotype II) and the Del-Rose vaccine strain (genotype III), indicating potential recombination between live vaccine strains and field isolates. To evaluate pathogenicity, one Egyptian isolate (F883-2022 CAV) and Del-Rose vaccine were tested in Specific Pathogen Free (SPF) chicks. Chicks in the positive group displayed clinical symptoms, including weakness and stunted growth, with postmortem findings consistent with CAV infection. The vaccine group showed milder symptoms and less severe postmortem changes. This study provides important insights into the genetic diversity of CAV in selected Egyptian poultry farms showing recombination event between field strain and vaccine strains, highlighting the need for advanced vaccination programs, especially for broilers.
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