Scienceline Publication Repository: No conditions. Results ordered -Date Deposited. 2024-03-28T16:03:24ZEPrintshttp://eprints.science-line.com/images/Scienceline.pnghttp://eprints.science-line.com/2022-05-27T17:34:03Z2022-05-27T17:34:03Zhttp://eprints.science-line.com/id/eprint/101This item is in the repository with the URL: http://eprints.science-line.com/id/eprint/1012022-05-27T17:34:03ZMolecular Detection of Infectious Bursal Disease Virus in Broiler Chickens of Diyala Province, IraqMany broiler chickens farms in Diyala Province, Iraq, have shown clinical signs of infectious bursal disease virus (IBDV) in broiler chickens, including depression of birds, petechial hemorrhage in muscles of the thigh, and swollen bursa. Therefore, in the current study, necropsy samples (liver, spleen, bursa, and kidney) were collected from the mentioned broiler chickens. The samples were then subjected to conventional RT-PCR using specific primers to the VP2 gene. The results showed that five out of seven collected samples were positive to IBDV, and the RT-PCR produced a fragment of 260 bp. Furthermore, four tissue bursa samples were sent to AniCon Labor GmbH- Germany by using (FTA- card including four spots) for detection of IBDV by real-time RT-PCR using VP1 and VP2 genes to distinguish the pathogenic virulent strain of IBDV from non-virulent IBDV strains and to make the phylogenetic tree. Results showed that duplex RT-PCR generated a fragment of 690bp for VP1 gene and 700bp for VP2 genes of detected IBDV. Two out of 4 samples from suspected flocks were found positive with prevalence results of 50% for intermediated and non-virulent IBDV strains (IBDV nvv), and 50% (2 samples) were very virulent (vvIBDV). The threshold Cycle (Ct) value for RT-PCR for two isolates on bursa tissue ranged from 16.6 to 25.7. One strain was recorded in NCBI with the accession number of (MW8883071). Phylogenetic analysis of detected and sequenced IBDV indicated that the local studied virus was closely related to 710- Jordan isolate (accession number MF142560.1) and to the isolate 267-Jordan (MF 142517.1) with a higher identity reach of (99.2%).A. K. Al-Azzawiamer_alazawy@yahoo.comA. T. NasserK. S. Al-Ajeeli2022-05-27T17:33:57Z2022-05-27T17:33:57Zhttp://eprints.science-line.com/id/eprint/100This item is in the repository with the URL: http://eprints.science-line.com/id/eprint/1002022-05-27T17:33:57ZThe effect of Aspergillus fumigatus infection on antibody immune response to newcastle disease virus in broiler chickensAspergillus fumigatus infection might predispose birds to other respiratory infections with other pathogens such as Newcastle Disease Virus (NDV). This study aimed to investigate the incidence of Aspergillus fumigatus in commercial farms and its histopathological effects on respiratory organs and to evaluate the immunosuppressive effect of aspergillosis on NDV vaccinated birds. Aspergillus fumigatus was isolated from feedstuff and broilers in farms with respiratory manifestation. Twenty NDV-vaccinated broiler chickens of 10 days old were experimentally infected by feeding on feedstuff contaminated with Aspergillus fumigatus. Twenty vaccinated broilers but not fed the contaminated diet were used as the control group. Clinical signs, histopathological changes, NDV antibody levels in infected birds were recorded. Clinically, infected birds showed respiratory distress, dyspnea, gasping, ruffled feathers, green watery diarrhea, anorexia, lethargy, and unilateral drooping of wing. Histopathological changes were observed as disseminated granulomatous foci in the affected lungs, with caseous necrosis and leukocytes infiltration. The antibody immune response against NDV significantly reduced in infected birds compared with that of non-infected broilers. It is concluded, that Aspergillus fumigatus infection suppresses the immune responses and predisposes the broilers to other microbial infections, leading to considerable economic losses in the poultry industry.A. K. Al-Azawyamer_alazawy@yahoo.comK. S. Al-Ajeeli2022-05-27T17:33:49Z2022-05-27T17:33:49Zhttp://eprints.science-line.com/id/eprint/99This item is in the repository with the URL: http://eprints.science-line.com/id/eprint/992022-05-27T17:33:49ZSerological and molecular detection of chicken anemia virus in broiler and layer chickens in IraqChicken Anemia Virus (CAV) infects many bird species worldwide and causes immunosuppression. This condition can facilitate the infection of affected birds with other pathogens including bacteria, viruses, and fungi. No data were available on detection or isolation of CAV from birds in Iraq, therefore this study was designed to detect CAV antibodies in broilers and layers in some poultry farms. Accordingly, 200 samples were collected from broiler and layer farms (100 samples each) from different districts of Diyala province and subjected to the ELISA test. Also, 50 tissue samples from embryonated eggs from different hatcheries, four commercial viral vaccines, and 30 ELISA positive samples were subjected to PCR assay to detect the CAV DNA. The results showed that all of broiler and layer farms sampled were serologically positive for CAV antibodies. The overall seropositivity for CAV antibodies for both chicken breeds was 51.5%. In broilers, 43 out of 100 serum samples were positive for CAV antibodies, whereas 60 out of 100 serum samples from layers were CAV antibody-positive. According to age groups, significant differences were observed among one-week-old broilers (30.2%) compared to other age groups. In layers, the age group of 30 weeks showed a seropositivity rate of 33.3%. Conventional PCR test indicated that all tissue samples collected from suspected birds and embryonated eggs were negative for CAV DNA, but only 2 out of 30 serum samples were PCR positive. It is concluded that CAV is endemic in poultry farms of Iraq and may facilitate the vaccination failure against other viruses.K. S. Al-AjeeliA. K. Al-Azawyamer_alazawy@yahoo.comH. Ghazuan2022-05-23T18:22:45Z2022-05-23T18:22:45Zhttp://eprints.science-line.com/id/eprint/294This item is in the repository with the URL: http://eprints.science-line.com/id/eprint/2942022-05-23T18:22:45ZExperimental infection of local domestic and feral (Columba livia domestica) Pigeons with local isolate of H9N2 Influenza Virus: Virological and histopathological studyA local isolate of low pathogenic Avian Influenza Virus (AIV) H9N2 subtype was used in experimental infection of 50 domestic and 50 feral pigeons (Columba livia domestica) to determine the susceptibility of these birds to H9N2 infections and to study its histopathological effects on vaccinated and unvaccinated pigeons with H9N2 commercial vaccine. The birds were divided into five groups. Groups A and C contained 20 feral pigeons, B and D contained 20 domesticated pigeons. Group E contained 10 feral and 10 domesticated pigeons that were used as unvaccinated controls. Groups A and B were vaccinated with H9N2 and Newcastle disease virus commercial vaccines. Group C and D were vaccinated with Newcastle disease virus vaccine only. All groups except E were challenged with a local isolate of H9N2 serotype. Antibodies titers against AIV were estimated pre and post-vaccination using ELISA. The results indicated low antibody titers against AIV in all groups in pre-vaccination that ranged between 152.83 ± 42.01 and 337.00 ± 150.76 with no significant differences between groups. Post-vaccination antibody evaluation indicated high titers of anti-AIV antibodies in groups A and B (740.13 ± 214.38 and 673.00 ± 242.40, respectively) in comparison to pre-vaccination levels. Clinical signs appeared on 5th day post-vaccination that included mild respiratory signs, digestive disorders, and conjunctivitis in some birds of all groups. Histopathological changes in affected tissues appeared as moderate to severe multifocal necrosis diffused in the parenchymal cells of lung tissues. Infiltration with mononuclear inflammatory cells was detected in some lung tissue areas. Necrotic foci and mononuclear cell infiltration were also observed in trachea and liver of infected pigeons but mild changes were observed in intestine. The challenge virus was re-isolated in embryonated hen's eggs of nine days old by inoculation in allantoic cavity using samples collected from tissues and cloaca of infected pigeons showing clear clinical signs. The re-isolated virus was detected by the haemagglutination test using chicken RBCs and identified by haemagglutination inhibition test using a locally prepared hyperimmune serum to H9N2 in rabbits. In conclusion, pigeons are susceptible to AIV (H9N2) that might facilitate the transmission of the virus to other bird species.A. R. RasheedK. S. Al-AjeeliA. K. Al-Azawyamer_alazawy@yahoo.com