Researchers analyzed extraintestinal E. coli isolates from healthcare settings in Olmsted County, Minn., that were submitted to laboratories in February and March 2011. They found several predictors of ST131 carriage:
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• Older age. ST131 accounted for 50 percent of E. coli isolates from patients aged 91 to 100, compared with 26 percent of isolates from patients aged 51 to 60 and 5 percent of isolates from patients aged 11 to 20.
• Long-term care facility residence. ST131 accounted for 76 percent of isolates from LTCF residents.
• Previous urinary tract infection.
• High-complexity infection.
• Previous use of fluoroquinolones, macrolides and extended-spectrum cephalosporins.
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