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Detection of food borne pathogen is of outmost importance in the food industries and related agencies. For the last few decades conventional methods were used to detect food borne pathogens based on phenotypic characters. At the advent of complementary base pairing and amplification of DNA, the diagnosis of food pathogen became rapid and target specific. RNA based methods such as NASBA and Real Time RT-PCR are even more sensitive as they reflect pathogen viability in food system. This