Vetrimycin 100 is a broad-spectrum antibiotic that is effective against a wide range of Gram-positive and Gram-negative organisms that are pathogenic for cattle. It is indicated for use in beef cattle and calves, non-lactating dairy cattle and dairy calves for the treatment of bacterial pneumonia and shipping fever complex associated with Pasteurella spp., bacterial enteritis (scours) caused by Escherichia coli, necrotic pododermatitis (foot rot) and calf diphtheria caused by Fusobacterium necrophorum, wooden tongue caused by Actinobacillus lignieresii, and wound infection and traumatic injury caused by oxytetracycline-susceptible strains of streptococcal and staphylococcal bacteria. Not for use in lactating dairy cattle or in calves to be processed for veal.