Shimauchi Y, Okamura K, Koki A, Hasegawa M, Date M, Fukagawa Y, Kouno K, Ishikura T
J Antibiot (Tokyo). 1978 Apr;31(4):261-9. doi: 10.7164/antibiotics.31.261.
A streptomycete strain, P3409, which produced new basic macrolide antibiotics, deltamycins A1, A2 and A3 and carbomycin A (deltamycin A4) was considered to be a new subspecies for which the name Streptomyces halstedii subsp. deltae was proposed. Deltamycins A1, A2, A3 and A4 which were active against Gram-positive bacteria were produced in organic complex media.