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. 2015 Oct 15;5:15223. doi: 10.1038/srep15223

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Two groups are shown by colors and ellipses, while dots represent 40 individual strains. Red: EV-D68 strains in the USA in 2014—Group O; blue: EV-D68 strains before 2014 or outside of the USA—Group N. The five main clusters are shown in numbers.