Table 1.

Antibacterial activity (Minimal inhibitory concentration, MIC) of hop extract against P. acnes strains determined in the microdilution test. P. acnes strains were isolated from acne lesions or ordered by ATCC.

P. acnes Strains	Hop Extract µg/mL	Clindamycin µg/mL
P. acnes 199	3.1	0.8
P. acnes 201	3.1–6.2	<0.2
P. acnes 209	3.1	<0.2
P. acnes ATCC 6919	3.1	<0.2