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The Journal of Medical Microbiology, Vol 30, Issue 4 273-278, Copyright © 1989 by Society for General Microbiology

JOURNAL ARTICLE

Epidemiological typing of Streptococcus pyogenes by pyrolysis mass spectrometry

J. T. Magee, J. M. Hindmarch, I. A. Burnett and A. Pease
Department of Microbiology, Children's Hospital, Sheffield.

Strains of Streptococcus pyogenes from an outbreak of infection on a burns unit (15), a collection of routine isolates from another hospital(12) and isolates from a national survey of throat infections in children in the community(4) were examined blind by pyrolysis-mass spectrometry (Py-MS). The outbreak strains (M22 T12) previously found to give identical typing results in conventional tests, formed a closely similar cluster and were distinct from other hospital and community strains. One hospital and one community strain were loosely associated with this cluster. Another cluster comprised six antibiotic-susceptible strains and two community strains. Six strains did not fall within the clusters; four were antibiotic-resistant strains isolated in hospital, one an antibiotic-resistant strain isolated in the community, and one a susceptible hospital strain. Results show that Py-MS is a potentially valuable method for rapid comparison of strains in studies of infection.




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