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. 2017 Aug 21;7:8329. doi: 10.1038/s41598-017-08060-4

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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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Predation in two different batches of whole human serum. (a) Serum batch SLBN9196V. (b) Serum batch SLBN8826V. Graphs show individual biological repeats of the live bacterial counts from predation in serum experiments, results from each individual biological experiment (Expt) are represented by the same colour line on each graph. Changes in the population of both K. pneumoniae prey (Kp + HD100) and B. bacteriovorus HD100 predator (HD100 + Kp) were enumerated periodically during the predation assay. As a control, prey suspended in serum was enumerated periodically in the absence of B. bacteriovorus HD100 predator (Kp alone). Despite illustrating some differences, similar patterns were seen across all 6 experimental repeats.