Abstract
A striking feature of methicillin resistance in Staphylococcus aureus is the considerable heterogeneity of expression of resistance by cells in clonal populations: some are sensitive (or almost so), others are highly resistant, and others show intermediate resistance to the antibiotic. Subclones generally are also heterogeneous, suggesting variable inheritance or control of expression of resistance. The degree of heterogeneity and mean resistance is influenced by environmental parameters: temperature, osmolality, pH, light, anaerobiosis, chelating agents and metal ions, and prior exposure to β-lactam antibiotics.
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