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Eight new beta-lactam antibiotics and rosaramicin were tested for their activity against penicillin-susceptible and multiply resistant pneumococci. All of the beta-lactam drugs were 50- to 150-fold less active against the drug-resistant pneumococci when compared with their activity against penicillin-susceptible pneumococci. Rosaramicin activity was similar to that of erythromycin.
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Landesman et al. (1981) studied this question.
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