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. 2016 Nov 21;47:117. doi: 10.1186/s13567-016-0399-9

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© The Author(s) 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Prevalence of N(A ₉₀ ) in genotype 1 PRRSV. PRRSV strains carrying an amino acid other than a threonine at position 90 of N are represented by colored dots in a phylogenetic tree based on 225 ORF7 sequences, with blue for alanine, red for valine and green for serine. The fraction (and percentage) of strains harboring an alanine at position 90 are indicated for each subtype.