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Journal of Antimicrobial Chemotherapy (1993) 31, 559-568
© 1993 The British Society for Antimicrobial Chemotherapy

other

Enhanced Staphylococcus aureus susceptibility to immunodefences induced by sub-inhibitory and bactericidal concentrations of imipenem

Anna Maria Cuffini, Vivian Tuillo, Alessandra Allocco, Serglo Fazari, Fabrizia Glachino and Nicola A. Carlone

Institute of Microbiology, University of Turin Via Santena 9, 10126 Torino, Italy

Received 15 April 1992; accepted 23 November 1992

Recent evidence suggests that the selection of an antibiotic for the treatment of infection should take into account not only the drug's antimicrobial activity but also the way in which it interacts with host defence mechanisms, since this may influence the response to infection. In this study we have investigated the effects of miipenem on the activities of human macrophages against Staphylococcus aureus. Bacterial susceptibility to phagocytosis and intracellular killing were determined after S. aureus and macrophages were incubated both simultaneously with sub-inhibitory and bactericidal concentrations of imipenem and following pre-exposure of the organisms and the macrophages individually to the same concentrations of imipenem. At both concentrations and under both circumstances, imipenem potentiated the phagocytic and microbicidal activities of the macrophages.


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