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. 2017 Dec 12;7:17447. doi: 10.1038/s41598-017-17802-3

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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 images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Prevalence of VDV1 and DWV in US honey bees. (A) VDV1 and DWV genomic RNA levels normalised to the honey bee PR49 mRNA in 2010 and 2016 honey bee colony samples. (B) Geographical distribution of VDV1-positive apiaries sampled in 2010 (75 apiaries from Fig. 2A) and 2016 (603 apiaries, analysed further in Fig. 3). The maps were prepared using the free online tool https://createaclickablemap.com. This figure is not covered by the CC BY licence. [Copyright © 2012 Flynndustries, LLC]. All rights reserved.