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Dot blot hybridization assay was evaluated with Sal3 probe for rapid detection of Salmonella from pork samples. The Sal 3 probe (-5'OH) specificity with dot-blot hybridization found a DNA positive result of all salmonella serovars (S. typhimurium, S. enteritidis, S. vichow): while, there was negative result from 9 DNA samples of the negative control group. The conventional dot-blot hybridization methods (method A: System probe labeled DIG at 50-OH labeling DIG hybrids/ anti DIG-AP, detection with NBT/BCIP and method B: System probe labeled with biotin at 50-OH labeling biotin hybrids / streptavidin-HRP, detection with DAB) were compared with an application of catalyzed reporter deposition (CARD) to dot blot platform (method C: System probe labeled with biotin at 50-OH labeling biotin hybrids /1๐streptavidin-HRP /2๐streptavidin-HRP,+ system tyramide signal amplification (TSA), detection with DAB). The sensitivity of dot-blot hybridization methods for systems A, B and C were found C system has a high sensitivity for dot-blot hybridization method. The results were obtained at the lowest concentrations of 3 104 cfu / ml using a 2-day examination period. So, the separation processing of pathogens from meat samples is therefore essential. It is recommend that the use of appropriate DNA extraction kits or methods is critical for successful and valid CARD dot blot hybridization posed a challenge for salmonella detection on pork samples.
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