MRSA and multidrug-resistant Staphylococcus aureus in U.S. retail meats, 2010-2011.

Methicillin-resistant Staphylococcus aureus (MRSA) has been detected in retail meats, although large-scale studies are scarce. We conducted a one-year survey in 2010-2011 within the framework of the National Antimicrobial Resistance Monitoring System. Among 3520 retail meats collected from eight U.S. states, 982 (27.9%) contained S. aureus and 66 (1.9%) were positive for MRSA. Approximately 10.4% (107/1032) of S. aureus isolates, including 37.2% (29/78) of MRSA, were multidrug-resistant (MDRSA). Turkey had the highest MRSA prevalence (3.5%), followed by pork (1.9%), beef (1.7%), and chicken (0.3%). Whole-genome sequencing was performed for all 66 non-redundant MRSA. Among five multilocus sequence types identified, ST8 (72.7%) and ST5 (22.7%) were most common and livestock-associated MRSA ST398 was assigned to one pork isolate. Eleven spa types were represented, predominately t008 (43.9%) and t2031 (22.7%). All four types of meats harbored t008, whereas t2031 was recovered from turkey only. The majority of MRSA (84.8%) possessed SCCmec IV and 62.1% harbored Panton-Valentine leukocidin. Pulsed-field gel electrophoresis showed that all ST8 MRSA belonged to the predominant human epidemic clone USA300, and others included USA100 and USA200. We conclude that a diverse MRSA population was present in U.S. retail meats, albeit at low prevalence.

Ge B ，Mukherjee S ，Hsu CH ，Davis JA ，Tran TTT ，Yang Q ，Abbott JW ，Ayers SL ，Young SR ，Crarey ET ，Womack NA ，Zhao S ，McDermott PF ... -  《-》

Molecular typing of Staphylococcus aureus and methicillin-resistant S. aureus (MRSA) isolated from animals and retail meat in North Dakota, United States.

Buyukcangaz E ，Velasco V ，Sherwood JS ，Stepan RM ，Koslofsky RJ ，Logue CM ... -  《-》

Prevalence and characterization of methicillin-resistant Staphylococcus aureus isolates from retail meat and humans in Georgia.

Jackson CR ，Davis JA ，Barrett JB 《-》

Isolation of methicillin-resistant Staphylococcus aureus (MRSA) from retail meats in Hong Kong.

Boost MV ，Wong A ，Ho J ，O'Donoghue M ... -  《-》

Characterization of toxin genes and antimicrobial susceptibility of Staphylococcus aureus isolates from Louisiana retail meats.

Pu S ，Wang F ，Ge B 《-》