UBRO YELLOW contains a combination of antibiotics which give a wide spectrum of in vitro antibacterial activity for the treatment of bovine mastitis associated with penicillin, streptomycin and framycetin sensitive organisms.These include staphylococci (including penicillin resistant strains), streptococci (Str. agalactiae, Str. dysgalactiae and Str. uberis), corynebacteria, Arcanobacterium pyogenes, E. coli, Klebsiella and Pseudomonas.