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Classification of the 35 prevalent Swedish profiles, including the six reference strains (indicated by asterisks). UPGMA with 1% band tolerance and 1% optimization settings was used as the clustering method. Only DNA profiles obtained after restriction with XbaI are shown. The serotype (Fim) and pertactin type (PRN) represent the most prevalent types within the profile. Gp, grouping system described by Weber et al. (29).
