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. 2016 Oct 9;9:39–44. doi: 10.4137/IDRT.S40539

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© 2016 the author(s), publisher and licensee Libertas Academica Ltd.

This is an open-access article distributed under the terms of the Creative Commons CC-BY-NC 3.0 License.

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Hemolysis and antibiotic-induced hemolysis among P. acnes strains on Brucella Blood Agar. (A) Comparison of a hemolytic strain and a nonhemolytic P. acnes strain on the same Petri dish. (B) Appearance of strains showing weak antibiotic-induced hemolysis and strong antibiotic-induced hemolysis in P. acnes. (C) Absence of antibiotic-induced hemolysis surrounding a clindamycin Etest strip, which is photographed using transmitted light on a light box. (D) Absence of antibiotic-induced hemolysis surrounding a ciprofloxacin E-test strip, which is photographed using reflected light.