Oysters can accumulate potentially pathogenic bacteria, such as , and . The aim of this study was to detect the presence of these species and their toxigenic variants in oysters from the Gulf of Mexico sold in Mexico City. Oyster samples were studied using traditional culture and molecular polymerase chain reaction analysis. was present in 30.4% of the samples and its toxigenic variant in 26.1%. It was isolated only in deshelled oysters, mainly in the dry season. was present in 95.7% of the samples and the toxigenic variant was found in 17.4%. was identified in 60.9% of the samples, 38% of which corresponded to the environmental genotype and 21.7% to the clinical genotype, mainly in the cold season. Consumption of the oysters analyzed poses health risks due to the presence of species, especially in deshelled oysters.
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