Table 1. Concentrations (μg/mL) of antibiotics necessary to suppress 16-hour growth of C. difficile in combination with the indicated HDPs.

Antibiotic	No peptide	2 μM p1	2 μM p1Cu	4 μM p3	4 μM p3Cu	2 μM p1 4 μM p3
Vancomycin	4.000	2.000	0.0625	0.500	0.250	0.125
Metronidazole	2.000	0.500	1.0000	0.0625	1.000	0.125
Fidaxomicin	0.256	0.0500	0.0125	0.050	>0.100	0.00625
Ciprofloxacin	128	n/a	n/a	n/a	n/a	2.000

Antibiotic concentrations are given in μg/ml.