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Staphylococci are microorganisms increasingly associated with food poisoning. This work aimed to determine the prevalence, and to detect factors of virulence and resistance, of Staphylococcus spp . isolated from samples of food, utensils and handling surfaces in an industrial kitchen of a supermarket chain in Rio de Janeiro; and to analyze the presence of genes encoding staphylococcal enterotoxin H ( seh ) and antimicrobial resistance ( mecA ). A total of 50 samples were collected between January and March 2016. After isolation, microbial species were identified by MALDI-TOF MS, as well as seh and mecA genes, which were detected by polymerase chain reaction (PCR). Of the 50 samples analyzed, 45 (90%) were positive for Staphylococcus sp. Presence; 41 samples were of the genus, 37 of which were identified at the species level, 40 samples coagulase-negative Staphylococcus (CNS), and one coagulase-positive (CPS). The identification of the species by the MALDI-TOF MS technique proved to be accurate. The seh gene was detected in only one CNS sample ( S. saprophyticus ) , isolated from a cold slicer. When the PCR technique was performed for the detection of the mecA gene in the 41 strains obtained from Staphylococcus sp. , 6 food samples and 7 surface samples were positive. It is concluded that CNSs are widespread in the environment and need to be given more attention  with regard to their detection in food. DOI: 10.12957/demetra.2017.26426

demetra

DETECÇÃO DOS GENES mecA e seh DE Staphylococcus sp. ISOLADOS DE AMOSTRAS DE ALIMENTOS, SUPERFÍCIES E UTENSÍLIOS DE UMA COZINHA INDUSTRIAL DO RIO DE JANEIRO