Methicillin-Resistant Staphylococcus aureus in Retail Meat, Detroit, Michigan, USA
Figure. Dendrogram showing comparison of SmaI pulsed-field gel electrophoresis patterns, staphylococcal cassette chromosome (SCC) mec type, Panton-Valentine leukocidin (PVL) content, and agr type of methicillin-resistant Staphylococcus aureus (MRSA) isolated from meat samples. All MRSA isolates were resistant to β-lactam antimicrobial drugs (ampicillin, penicillin, and oxacillin) and grew on the 6 µg/mL of cefoxitin for screening methicillin resistance. *Isolates with the same arabic numbers were from the same sample; †only resistance to non–β-lactam antimicrobial drugs was listed. ID, identification; MLST, multilocus sequence typing; ST, sequence type; pos, positive; TET, tetracycline; NA, not available; CIP, ciprofloxacin; ERY, erythromycin; LEVO, levofloxacin.