Shoji S, Kikuchi H, Watanabe A, Motomiya M
Department of Internal Medicine, Tohoku University.
Nihon Rinsho. 1992 May;50(5):1049-53.
Strains of Methicillin-resistant Staphylococcus aureus (MRSA) are more frequently beta-lactamase-negative than those of Methicillin-susceptible S. aureus (MSSA). In the strains of MRSA, the beta-lactamase activity tends to be inversely related to the MIC's of Methicillin. Such a marked tendency has been observed in recent years.