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Other CRF proportions from 1990 to 2015. Countries are shaded according to the proportion of other CRFs in each time period: 2010 to 2015 (A), 2005 to 2009 (B), 2000 to 2004 (C), and 1990 to 1999 (D). Other CRFs, CRFs other than CRF01_AE and CRF02_AG. CRF, circulating recombinant form.
