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              Research 
              
              
(Published online: 
              15-09-2015) 
              
              8.  
              
              Rapid detection of Mannheimia haemolytica in lung tissues 
              of sheep and from bacterial culture - 
              Jyoti Kumar, Shivendra 
              Kumar Dixit and Rajiv Kumar 
              
              Veterinary World, 8(9): 1073-1077   
              
   
                
                
doi: 
              10.14202/vetworld.2015.1073-1077   Jyoti 
              Kumar: 
              
              Division of Animal Health, Central Sheep and Wool Research 
              Institute, Avikanagar - 304 501, Rajasthan, India; jyotivet@gmail.com 
              Shivendra Kumar Dixit: 
              
              Division of Animal Health, Central Sheep and Wool Research 
              Institute, Avikanagar - 304 501, Rajasthan, India; shivendradixit@yahoo.co.in Rajiv 
              Kumar: Animal Biotechnology Section, Central Sheep and Wool 
              Research Institute, Avikanagar - 304 501, Rajasthan , India;
              
              rajivbiotech028@gmail.com   
              Received: 10-01-2015, Revised: 02-07-2015, Accepted: 09-07-2015, 
              Published online:15-09-2015   
              
              
              Corresponding author:Jyoti Kumar, e-mail: jyotivet@gmail.com 
 
              Citation:Kumar J, Dixit SK, 
              Kumar R (2015) Rapid detection of Mannheimia haemolytica in 
              lung tissues of sheep and from bacterial culture, Veterinary 
              World 8(9): 1073-1077. 
 
              Abstract 
 Aim:
              This study was aimed to detect Mannheimia haemolytica in lung 
              tissues of sheep and from a bacterial culture. 
              Introduction: M. haemolytica 
              is one of the most important and 
              well-established etiological agents of pneumonia in sheep and 
              other ruminants throughout the world. Accurate diagnosis of 
              M. haemolytica 
              primarily relies on bacteriological 
              examination, biochemical characteristics and, biotyping and 
              serotyping of the isolates. In an effort to facilitate rapid
              M. haemolytica 
              detection, polymerase chain reaction 
              assay targeting Pasteurella haemolytica
              serotype-1 specific antigens (PHSSA), 
              Rpt2 and 12S ribosomal RNA (rRNA) genes were used to detect 
              M. haemolytica 
              directly from lung tissues and from 
              bacterial culture. 
              Materials and Methods: A total of 12 archived lung tissues 
              from sheep that died of pneumonia on an organized farm were used. 
              A multiplex polymerase chain reaction (mPCR) based on two-amplicons 
              targeted PHSSA and Rpt2 genes of M. 
              haemolytica were used for 
              identification of M. haemolytica 
              isolates in culture from the lung 
              samples. All the 12 lung tissue samples were tested for the 
              presence M. haemolytica 
              by PHSSA and Rpt2 genes based PCR and its 
              confirmation by sequencing of the amplicons. 
              Results: All the 12 lung tissue samples tested for the 
              presence of PHSSA and Rpt2 genes of M. 
              haemolytica by mPCR were found 
              to be positive. Amplification of 12S rRNA gene fragment as 
              internal amplification control was obtained with each mPCR 
              reaction performed from DNA extracted directly from lung tissue 
              samples. All the M. haemolytica 
              were also positive for mPCR. No 
              amplified DNA bands were observed for negative control reactions. 
              All the three nucleotide sequences were deposited in NCBI GenBank 
              (Accession No. KJ534629, KJ534630 and KJ534631). Sequencing of the 
              amplified products revealed the identity of 99-100%, with 
              published sequence of PHSSA and Rpt2 genes of 
              M. haemolytica 
              available in the NCBI database. Sheep 
              specific mitochondrial 12S rRNA gene sequence also revealed the 
              identity of 98% with published sequences in the NCBI database. 
              Conclusion: The present study emphasized the PCR as a valuable 
              tool for rapid detection of M. 
              haemolytica in clinical 
              samples from animals. In addition, it offers the opportunity to 
              perform large-scale epidemiological studies regarding the role of
              M. haemolytica 
              in clinical cases of pneumonia and other 
              disease manifestations in sheep and other ruminants, thereby 
              providing the basis for effective preventive strategies. 
              Keywords: lung tissues, 
              Mannheimia haemolytica, 
              multiplex polymerase chain reaction, 
              Pasteurella haemolytica 
              serotype-1 specific antigens, Rpt2, 12S ribosomal RNA, sheep. 
 
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