| 
              
              
              Open Access  
 
              
              
              
              Research 
              
              
(Published 
				online: 18-12-2016)  
              18. 
				
              
              Detection, identification, and 
              differentiation of sheep pox virus and goat pox virus from 
              clinical cases in Giza Governorate, Egypt - 
              
              M. A. Mahmoud and M. H. Khafagi 
              
              Veterinary World, 9(12): 1445-1449   
              
   
                
                
doi: 
              
				
				10.14202/vetworld.2016.1445-1449 
                
                
                M. A. Mahmoud: 
                
                Department of Parasitology and Animal Diseases, Veterinary 
                Research Division, National Research Centre, Dokki 12622, Giza, 
                Egypt; m_elfatatri@yahoo.com 
              
              M. H. Khafagi: 
              
              Department of Parasitology and Animal Diseases, Veterinary 
              Research Division, National Research Centre, Dokki 12622, Giza, 
              Egypt; manalhamdy41@yahoo.com   
              
              Received: 20-08-2016, Accepted: 16-11-2016, Published online: 
              18-12-2016   
				
              	
              	Corresponding author: 
              	
				
                M. A. Mahmoud, e-mail: m_elfatatri@yahoo.com 
 
              Citation: 
              
              Mahmoud MA, Khafagi MH (2016) Detection, identification, and 
              differentiation of sheep pox virus and goat pox virus from 
              clinical cases in Giza Governorate, Egypt, 
              
              Veterinary World, 9(12):1445-1449. 
 
              
				Abstract 
 
              
              
              Aim: 
              
              To isolate, identify, and differentiate 
              
              Capripoxviruses 
              (CaPV) 
              (sheep pox virus and goat pox virus) infections by egg 
              inoculation, transmission electron microscopy (TEM), and 30 kDa 
              RNA polymerase subunit gene-based polymerase chain reaction (PCR) 
              (RPO30) in clinically affected animals in Hawamdia township of 
              Giza Governorate, Egypt. 
              
              
              Materials and Methods: 
              A 
              total of 37 scab samples were collected from clinically suspected 
              field cases of sheep pox and goat pox. These samples were 
              collected during (2014-2015) during different outbreaks of sheep 
              pox and goat pox from Hawamdia township of Giza Governorate, 
              Egypt. The samples were subjected to egg inoculation, TEM, and 
              (RPO30) gene-based PCR. By using the egg inoculation: Previously 
              prepared 37 scab samples (n=23 sheep and n=14 goats) were 
              inoculated on the chorioallantoic membrane of specific pathogen 
              free (SPF) embryonated chicken eggs (12 days old age). In the 
              presence of the suitable percentage of humidity and candling, the 
              inoculated eggs were incubated at 37°C. By using the TEM: Samples 
              showed positive pock lesions on the chorioallantoic membranes, 
              were fixed in glutaraldehyde, then processed and sectioned for 
              TEM. Using the (RPO30) gene-based PCR assay, 30 of positive 
              samples after egg inoculation (n=19 sheep and n=11 goats) were 
              screened. 
              
              
              Results: 
              
              Using the egg inoculation, a characteristic pock lesions for 
              poxviruses were seen in 30/37 (n=19 sheep and n=11 goats) 
              (81.08%). Using the TEM, examination of the positive samples after 
              egg inoculation revealed positive result in 23/30 (n=15 sheep and 
              n=8 goats) (76.66%). The positive results represented by the 
              presence of negatively stained oval-shape virus particles. Using 
              the (RPO30) gene-based PCR assay, out of 30 total of positive 
              samples after egg inoculation (n=19 sheep and n=11 goats) were 
              screened, 27 (90%) samples (n=17 sheep and n=10 goats) were 
              positive. The given band sizes of sheep and goats were 172 and 152 
              bp, respectively. 
              
              
              Conclusion: 
              
              PCR assay depended on RPO30 gene can be used lonely for the 
              detection, identification, and differentiation of CaPVs. RPO30 
              gene-based PCR assay in combination with gene sequencing helps in 
              molecular epidemiological studies of CaPV infection. 
              
              Keywords: 
              
              Capripoxvirus, polymerase chain reaction, goat pox, isolation, 
              RPO30 gene, sheep pox, transmission electron microscope. 
 
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