Antibiotic AB-64, a new indicator-pigment antibiotic from Actinomadura roseoviolacea var. rubescens.

During the course of screening for new antibiotics from rare actinomycetes in our laboratory, a rare actinomycete initially designated as strain A-3416 was found to produce an antibiotic with strong activity against staphylococci resistant to various antibiotics. From its unique physicochemical properties, it was judged to be a new antibiotic and named antibiotic AB-64. In this paper, taxonomical studies of strain A-3416, fermentation, isolation and characterization of antibiotic AB-64 are described.