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A majority-rule consensus tree (A) of maximum likelihood analysis of the Swedish BCoV strains sampled across the country (B) during four in-stable seasons. Four clusters are labelled I, II, III, and IV, respectively. Bootstrapping values (italic) are placed next to the major clades. Bar indicates changes per site. The tree is presented as rooted with LY-138, F15 and Hu-OC43. Herd C1 is not included on the map.
