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The Journal of Medical Microbiology, Vol 30, Issue 4 245-252, Copyright © 1989 by Society for General Microbiology

JOURNAL ARTICLE

Production of "virulence factors" by "epidemic" methicillin-resistant Staphylococcus aureus in vitro

J. Z. Jordens, G. J. Duckworth and R. J. Williams
Department of Medical Microbiology, London Hospital Medical College.

The production of virulence factors was determined quantitatively for clinical isolates of methicillin-resistant (MRSA) and methicillin-sensitive (MSSA) strains of Staphylococcus aureus from The London Hospital. The examined factors were: production of enterotoxins A, B, C and D, determined by ELISA; quantitation and differentiation of the membrane-damaging alpha, beta, gamma and delta haemolysins; and coagulase production determined by a chromogenic assay. Enterotoxin A was produced by MRSA but not by MSSA. All the strains produced haemolysins alpha, gamma and delta at similar levels, but MRSA produced significantly more coagulase than MSSA. MRSA and MSSA were compared in a phagocytosis assay but there was no difference between the phagocytosis of MRSA and MSSA by human polymorphonuclear leucocytes. These findings indicate that MRSA from The London Hospital is at least as well equipped to cause disease as other isolates of S. aureus, and probably better equipped than most hospital isolates of MSSA.


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