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Map showing the geographical areas from which the viral isolates included in the study were obtained. 1 = Kemijoki, 2 = Oulujoki, 3 = Vuoksi, 4 = Kymijoki, 5 = Ähtävänjoki, 6 = Bothnian Bay, 7 = Bothnian Sea, 8 = Åland Islands, freshwater and coastal area, 9 = Archipelago Sea (eastern parts), 10 = Gulf of Finland. SE = Sweden, FI = Finland, RU = Russia
