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              Open Access  
Copyright: The authors. This article is an open access 
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              Research (Published 
online :  26-08-2013) 
17. Investigation on the status of Johne's disease based on agar gel 
immunodiffusion, ziehl-neelsen staining and nested PCR approach in two cattle 
farm - Anand Mohan, Pranabananda Das, Neelam Kushwaha, Kaliaperumal 
Karthik and Ankush Kiran NiranjanVeterinary World, 6(10): 778-784
 
                
              doi: 
              10.14202/vetworld.2013.778-784 
                
              
              
          
 
              Abstract 
 
              Background and Methods: 
              Paratuberculosis is a chronic disease of ruminant, caused by 
              Mycobacterium avium subsp. paratuberculosis (Map), clinically 
              infected animals produce high level of antibodies in blood and 
              shed detectable amount of Map organisms in feces. Several 
              serological and molecular tests are utilized for detection of 
              antibodies or DNA of the organism in clinical samples. Present 
              study indicates the status of paratuberculosis in two distinct 
              cattle farms with different organizational set-ups viz. organized 
              and unorganized. We used agar gel immunodiffusion (AGID) assay for 
              the detection of antibodies in blood. Ziehl-Neelsen (ZN) staining 
              of fecal smears was done to observe acid-fast bacilli and Nested 
              PCR targeted to IS900 and f57 sequences, was performed to confirm 
              the pathogen. Results: Sera samples of cattle, from organized farm, did 
              not show any visible precipitating band with AGID assay. However, 
              fecal smears of few cattle (3.57%) were positive for acid-fast 
              bacilli. When confirmed with nested PCR, only one fecal sample 
              (0.71%) was found positive for Map. In case of unorganized farm, a 
              large number of cattle (38.75%) showed precipitating antibodies 
              with AGID assay and the percentage of fecal smears that showed 
              acid-fast bacilli was 26.62%. Nevertheless, fecal samples 
              containing Map DNA was confirmed in 14.37% of fecal sample by 
              nested PCR.
 Conclusions: An organized farm, with better hygiene and 
              management practices, showed lesser occurrence of paratuberculosis 
              in cattle in comparison to unorganized farm. Not all AGID assays 
              positive cattle might be an efficient shedder of Map and mare 
              detection of acid-fast bacilli in fecal smears did not always 
              indicate the presence of Map organism. Cattle infected with JD 
              were mostly in the age group of six years and above.
 Keywords: AGID, f57, Johne's disease, IS900, Nested PCR, 
              Ziehl-Neelsen staining, Mycobacterium avium subspecies 
              paratuberculosis.
 
 
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