Spiramycin 1 Acetate is a member of the Spiramycin macrolide family of bacterio static antibiotic compounds. The family of compounds was originally isolated from cultures of Streptomyces ambofaciens, a soil bacteria native to northern France. The mixture of Spiromycines has been separated into three classes I, II, III, which each have unique structural differences. The namesake compound spiramycin (aka Spiramycin Acetate in Japan) is approved for use as an antibiotic for the treatment of Gram-positive cocci and rods, Gram-negative cocci and Legionellae, mycoplasmas, chlamydiae, spirochetes, Toxoplasma gondii and some species of Cryptosporidium.