Table 3. MIC values for indicated microorganisms as determined by microdilution assay.

p4 (µg/ml)	E. coli ATCC 11775	S. aureus ATCC 6538	P. aerugin. ATCC 10145	C. albicans ATCC 24433	S. epiderm. ATCC 12228	S. epiderm. ATCC 14990
100	100	100	100	100	100	100
50	100	100	100	100	100	100
25	100	100	100	100	100	100
12.5	100	100	100	100	100	100
6.3	100	98.9	100	100	99.7	99.1
3.1	100/98.6	72	99.4	80	96.8	97
1.6	92.1	57	96.7	39	83	84
0.8	82	23	71	18	61	38
0.4	57	11	23	7	16	34
0.2	16	0	6	14	17	17
0.1	20	0	17	0	8	8
0.05	7	0	0	0	0	0
0.02	26	0	0	0	0	0
0.01	0	0	0	0	0	0
MIC (µg/ml)	3.1–6.3	12.5	6.3	6.3	12.5	12.5

Data in columns indicate % of killing for each strain. The MIC was defined as the lowest concentration of p4 showing no visible growth (100% of killing). Mean of at least 3 measurements is shown.