title: Studies on bacteriophages of Propionibacterium acnes.
abstract: With the help of adaptation experiments, 61 phage preparations out of 36 Propionibacterium acnes bacteriophages (32 isolated by us and 4 sent from abroad) were established. On the basis of their stability, spectrum of activity, and virulence, 13 phages were selected for phagetyping. 58 well-classified P. acnes strains were grouped into 7 phage-types. 7 strains of P. granulosum, two strains of P. avidum, and one yet ungroupable microserophilic propionibacterium strain were resistant to all 61 phages, even when tested in 100 X RTD. A combination of phagetyping with biotyping resulted in data especially useful for the differentiation of P. acnes.
mesh_terms: D001434:Bacteriophage Typing; D001435:Bacteriophages / Q000032:analysis* / Q000302:isolation & purification; D008242:Lysogeny / Q000187:drug effects; D008937:Mitomycins / Q000494:pharmacology; D011425:Propionibacterium acnes / Q000145:classification; D013997:Time Factors; D010948:Viral Plaque Assay
chemical_list: D008937:Mitomycins