Cephatin intramammary suspension is indicated for the treatment of clinical mastitis in lactating cattle and buffaloes. Cefoperazone is the broad spectrum cephalosporin also effective in treating pseudomonal bacterial infections. Antibacterial Spectrum: Cephatin Intramammary suspension is indicated for the treatment of clinical bovine mastitis caused by a wide range of organisms including the Streptococcus agalactiae; Streptococcus dysgalactiae; Streptococcus uberis; Staphlococcus aureus (including penicillinase producing strains); Escherichia coli; Corynebacterium pyogenes Pseudomonas aeruginosa, Micrococcus spp; Klebsiella spp.