Gastrointestinal diseases are a problem among Mexican population and worldwide, because they can be transmitted by contaminated food or mismanagement and manipulation. Ignorance of the causal agent of these diseases can result in an incorrect treatment to the patient, the emergence of resistant microorganisms or a complication of the disease that can lead to death. It is for these reasons that the present work is focused on identifying the most common causative agents of gastroenteritis, Escherichia coli O157:H7 and Salmonella spp. in raw food in the city of Puebla, and thus be able to propose measures for the control of these diseases. In analyzed samples of meat of different presentations, the percentage recovery of strains of Salmonella spp. was 22.7 % while the recovery of E. coli O157:H7 was 1.66 %. In the different samples of vegetables the recovery percentage for Salmonella spp. And E. coli O157:H7 was 2.5 %. The presence of Salmonella spp. or E. coli O157:H7 wasn�t demonstrated in egg samples.
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