Affiliation: | 1. Department of Microbiology and Regional Public Health Laboratory, John Radcliffe Hospital, OX3 9DU, Headington, Oxford, UK 2. Service de Microbiologie Médicale, Hopital Saint-Joseph, 7, Rue Pierre Larousse, 75674, Paris Cedex 14, France 3. Institut fur Medizinische Mikrobiologie, Hufelandstra?e 55, 43 Essen, FRG 4. Istituto Microbiologico, Ospedale San Carlo Borromeo, Via Pio Secondo, 3, 20153, Milan, Italy
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