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1 Departments of Pharmacology and Microbiology, Washington University School of Medicine, St. Louis, Missouri
The stepwise development of resistance to D-cycloserine has been observed. The most resistant organisms were more than 50 times as resistant to the antibiotic as the parent strain. No cross-resistance to 9 other antibiotics examined occurred. The mutants were identical to the parent strain by staphylococcal phage typing and by agglutinations in staphylococcal specific factor sera.
Submitted on July 17, 1963