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. 2020 Dec 22;95(2):e01580-20. doi: 10.1128/JVI.01580-20

FIG 5.

FIG 5

URF proportions from 1990 to 2015. Countries are shaded according to the proportion of URFs in each time period: 2010 to 2015 (A), 2005 to 2009 (B), 2000 to 2004 (C), and 1990 to 1999 (D). URF, unique recombinant form.