Abstract
Studies on hamycin susceptibility of 84 Candida strains showed that all the strains tested had a minimal inhibitory concentration of 0·16 μg/ml or under. It was possible to develop a high degree of in vitro resistance to hamycin in strains of C. albicans and C. tropicalis. Hamycinresistant variants did not exhibit any cross-resistance to nystatin and amphotericin B. A complete to partial loss of resistance was observed in all hamycin-resistant strains after repeated transfers in antibiotic-free medium. A majority of resistant variants showed alterations in some of their morphological and cultural properties.

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