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              Research 
              
(Published online: 21-03-2015) 
              
              20.
              
              Patho-epidemiological study on Genotype-XIII 
              Newcastle disease virus infection in commercial vaccinated layer 
              farms - J. H. Khorajiya, Sunanda Pandey, Priya D. 
              Ghodasara, B. P. Joshi, K. S. Prajapati, D. J. Ghodasara and R. A. 
              Mathakiya 
              
              Veterinary World, 8(3): 372-381   
              
   
                
                
doi: 
              10.14202/vetworld.2015.372-381   J. H. 
              Khorajiya: 
              Department of Veterinary Pathology, College of Veterinary Science 
              and Animal Husbandry, Anand Agricultural University, Anand, 
              Gujarat - 388 001, India;
              
              
              jainudeen_1990@rediffmail.com Sunanda 
              Pandey: 
              Department of Veterinary Pathology, College of Veterinary Science 
              and Animal Husbandry, Anand Agricultural University, Anand, 
              Gujarat - 388 001, India;
              
              
              drsunandapandey@gmail.com Priya 
              D. Ghodasara: 
              Department of Veterinary Pathology, College of Veterinary Science 
              and Animal Husbandry, Anand Agricultural University, Anand, 
              Gujarat - 388 001, India;
              
              
              pdghodasara.vet@gmail.com B. P. 
              Joshi: 
              Department of Veterinary Pathology, College of Veterinary Science 
              and Animal Husbandry, Anand Agricultural University, Anand, 
              Gujarat - 388 001, India;
              
              
              b4bpjoshi@gmail.com K. S. 
              Prajapati: 
              Department of Veterinary Pathology, College of Veterinary Science 
              and Animal Husbandry, Anand Agricultural University, Anand, 
              Gujarat - 388 001, India;
              
              
              kanti_prajapati@yahoo.com D. J. 
              Ghodasara: 
              Department of Veterinary Pathology, College of Veterinary Science 
              and Animal Husbandry, Anand Agricultural University, Anand, 
              Gujarat - 388 001, India;
              
              
              dinghodasara@gmail.com R. A. 
              Mathakiya: Department of Veterinary Microbiology, College of 
              Veterinary Science and Animal Husbandry, Anand Agricultural 
              University, Anand, Gujarat - 388 001, India;
              
              dr_ramathakiya@yahoo.co.in   
              Received: 30-11-2014, Revised: 12-01-2015, Accepted: 16-01-2015, 
              Published online: 21-03-2015   
              
              
              Corresponding author: 
              
              Sunanda Pandey, e-mail: drsunandapandey@gmail.com 
 
              Citation:Khorrajiya JH, Pandey 
              S, Ghodasara PD, Joshi BP, Prajapati KS, Hodasara DJ, Mathakiya RA 
              (2015) Patho-epidemiological study on genotype-XIII Newcastle 
              disease virus infection in commercial vaccinated layer farms. 
              Veterinary World 8(3):372-381. 
 
              Abstract 
 Aim:
              The present research work was carried out to study the patho-epidemiological 
              aspects of Genotype-XIII Newcastle disease virus (NDV) infection 
              in commercial layer in and around Anand, Gujarat. As the outbreaks 
              have reported in vaccinated flocks, it was felt necessary to study 
              the disease with respect to its changing pathogenicity and 
              relevant aspects. 
              Materials and Methods: The study comprised of patho-epidemiology 
              of Newcastle disease (ND) by information collected from different 
              layer farms suffering from the disease in relation to incidence 
              pattern and mortality, duration of mortality, susceptible age, and 
              loss due to production performance. Clinical signs were recorded 
              based on observations. During postmortem, gross lesions were also 
              recorded. For histopathological examination visceral organs 
              according to lesions were collected in 10% formalin and processed 
              slide stained by hematoxylin and eosin for microscopic 
              examination. Cultivation of virus was done in embryonated specific 
              pathogen-free (SPF) eggs of 9-11 days and isolation of virus was 
              done for haemagglutination (HA) and haemagglutination inhibition 
              (HI) test and to identify pathotype of virus by intracerebral 
              pathogenicity index (ICPI) test to determine the virulence of 
              virus. The Genotype-XIII NDV was confirmed by F gene sequence and 
              whole genome sequence. 
              Results: During the study mortality due to ND was recorded in 
              13 layer flocks in spite of routine vaccination, which usually 
              contain Genotype-II strain of virus. The mortality was observed as 
              high as above 50% with an average of 21.21%. The susceptible age 
              for disease was found to be 6-14 weeks. The duration of mortality 
              observed was 23 days. The disease resulted in a significant 
              reduction in body weight, feed intake and drop in egg production. 
              Majority of the outbreaks appeared during extremely hot months of 
              April to June. Greenish diarrhoea was frequently seen in birds 
              that survived early in infection. Mortality continued for 2-3 
              weeks and reduced with appearance of torticollis. Gross lesions 
              were characterized by multifocal to diffuse hemorrhages around 
              proventricular glands, necrotic (diphtheritic) haemorrhagic ulcers 
              throughout the intestine, disseminated multiple foci of necrosis 
              and pin-point hemorrhages in the spleen parenchyma. The 
              microscopic lesions include focal to diffuse hemorrhages, diffuse 
              infiltration of mononuclear cells, necrosis, and degeneration in 
              visceral organs. All the 13 farm samples (n=13) resulted in death 
              of all the embryos following incubation up to 72 h 
              post-inoculation. All the 13 allantois fluids from field samples 
              along with F and R2B vaccine sample were found positive for HA 
              activity, which was further confirmed by HI using known NDV serum. 
              The values of ICPI were 2.0 which were indicative of velogenic 
              nature of the field NDV strain. 
              Conclusion: The study indicated that presently available live 
              and attenuated vaccines which include Genotype-II NDV have failed 
              in protecting the flocks against Genotype-XIII and resulted in 
              outbreaks with mortality above 50%. ICPI score of 2.0 confirmed 
              that the present outbreaks were due to Genotype-XIII NDV, which is 
              velogenic in nature.  
              Keywords: genotype, histopathology, 
              intra-cerebral pathogenicity index, Newcastle disease. 
 
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