Percentages of antibiotic resistance for the <i>E. faecium</i> and <i>E. faecalis</i> isolates from clinical and water samples.

aInterpretive criteria are according to CLSI, 2008 (Clinical and Laboratory Standards Institute, 2008); Amp = ampicillin, Fd = nitrofurantoin, Imp = imipenem, Rif = rifampin, Te = tetracycline, Va = vancomycin, HLG = high-level resistance to gentamicin, and HLS = high-level resistance to streptomycin. bThe numbers in parentheses are the numbers of strains tested. *Four and **two strains had intermediate resistance to vancomycin (8 µL/mL). Clinical samples (blood, cerebrospinal fluid, eye, liver, peripheral venous catheter, pleural fluid, sputum, urine, wound, and respiratory system). Water samples (groundwater for human use and consumption (wells), water from the Xochimilco wetland and water from a water treatment plant (water used for agricultural irrigation). §Fisher-Freeman-Halton exact test. NS = not significant.