Failure of Coagulase-negative Staphylococci to Transfer Antibiotic Resistance to Staphylococcus aureus 1030 in Mixed Cultures

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Abstract
There were 153 isolates of coagulase-negative staphylococci (obtained from human skin) that failed to transfer resistance to either Cd ions (46 isolates), trimethoprim (37 isolates), erythromycin (25 isolates) or tetracycline (45 isolates) to S. aureus strain 1030 or to each of 10 of its lysogenic derivatives in mixed cultures. There were 33 trimethoprim-resistant coagulase-negative staphylococcal isolates (obtained from the human intestine) that also failed to transfer this resistance to the recipients in mixed cultures.