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. 2017 Jun 14;9(4):383–394. doi: 10.1007/s12560-017-9306-4

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© The Author(s) 2017

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.

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Fig. 2 — Relative concentration of PV1 (white) and MS2 (gray) spiked into eluate from filters dosed with preservatives. Relative concentration was determined by dividing the PV1 or MS2 measured from filters dosed with preservatives by PV1 or MS2 measured in control filters (PBS dosed only). Box and whisker plot: upper, middle, and lower box lines show the first, second, and third quartiles, respectively; markers ‘x’ show the mean (n = 2) (Color figure online)