E: erythromycin, Tet: tetracycline, G: gentamycin, Chl: chloramphenicol, Cip: ciprofloxacin, N: nitrofurantoin, Amp: ampicillin, A/C: amoxicillin/clavulanate, TMS: trimethoprim-sulfamethoxazole, Cef: ceftriaxone, ND: not determined, R: resistant, S: susceptible, and I: intermediate. Inhibition zone diameters were measured in millimeters. ®(ATCC 25922); ®®(ATCC 25923). ♦Isolate 14 is from the same source as isolate 1. •Highly resistant, no inhibition zone (0.00 mm). #The CLSI guideline states in vitro activity does not correlate with in vivo activity.