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Serotyping was carried out on 80 coded strains, distributed to all laboratories taking part in the WHO L. monocytogenes multicenter subtyping study. All six laboratories used the method recommended by their coordinator. All 80 strains were typeable. There was complete agreement between the six laboratories on 49 (61.3%) strains (21 serovar 1/2a and 28 serovar 4b strains) which in turn were identical...