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, A. PAUL ADAMS, AND I. A. SCHIPPER. Antibiotic sensitivities of organisms isolated from mastitic and nonmastitic mammary secretions. Appl. Microbiol. 13:762-765. 1965.-Antibiotic sensitivity tests to determine the minimal inhibitory concentrations (MIC) and the minimal lethal concentrations (MLC) for six antibiotics were conducted against mastitic isolates of staphylococci in skim milk and broth. The MIC and the MLC for all the antibiotics except benzylpenicillin were considerably higher in skim milk than in broth. Benzylpenicillin was the most effective antibiotic tested in either medium, and dihydrostreptomycin was the least effective against the organisms tested.