Some important antibiotics Antibiotic Producer Spectrum Discovered Market 1) Penicillins Penicillium chrysogenum G+bact. 1938 40% Streptomycin Streptomyces griseus G-G+bact 1944 Chloramphenicol Streptomyces venezuelae Broad 1947 Tetracyclines Streptomyces aureofaciens Broad 1948 20% Cephalosporins Cephalosporium spp. G+G-bact 10% Erythromycin Streptomyces erythreus G+ 1952 10% 1)Market share 195.Total production voume of penicillins was 17000tones in1980