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Antibiotic-Resistant Staphylococci Isolated from Hermetically Packaged Frozen Vegetables

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The Chemistry of Frozen Vegetables

Part of the book series: SpringerBriefs in Molecular Science ((BRIEFSCHEFO))

Abstract

The aim of this study was to evaluate the prevalence of antibiotic-resistant staphylococci in frozen vegetables during long-term storage of these products. The vegetables were subjected to freezing at −40 °C (fluidisation technique). Experimental temperature values in frozen tissues reached −18 °C. Vegetables were packed in polyethylene airtight bags. The study involved 33 assortments of frozen vegetables. The number of Staphylococcus aureus in frozen vegetables achieved 3.5 log10 CFU/g; 4.7% of these samples showed unacceptable microbial counts. The maximum level of methicillin-resistant S. aureus was 4.25 log10 CFU/g. All samples showed also the presence of aerobic bacteria without correlation between their number and staphylococci counts. On these bases, the Regulation (EC) No. 2073/2005, recently amended in 2007, could be modified with a condition concerning the absence of S. aureus in vegetable products ready for frozen storage because of the possible detection or the presence of methicillin-resistant S. aureus in final products.

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Abbreviations

CFU:

Colony Forming Unit

MR:

Methicillin resistant

MRSA:

Methicillin-resistant Staphylococcus aureus

MSSA:

Methicillin-sensitive S. aureus

MSSA:

Methicillin-susceptible S. aureus

MDRA:

Multidrug-resistant S. aureus

PE:

Polyethylene

RH:

Relative humidity

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Correspondence to Izabela Steinka .

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Steinka, I., Barone, C., Parisi, S., Micali, M. (2017). Antibiotic-Resistant Staphylococci Isolated from Hermetically Packaged Frozen Vegetables. In: The Chemistry of Frozen Vegetables. SpringerBriefs in Molecular Science(). Springer, Cham. https://doi.org/10.1007/978-3-319-53932-4_1

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