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. 2021 Nov 2;149:e244. doi: 10.1017/S0950268821002338

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© The Author(s) 2021

This is an Open Access article, distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives licence (http://creativecommons.org/licenses/by-nc-nd/4.0), which permits non-commercial re-use, distribution, and reproduction in any medium, provided that no alterations are made and the original article is properly cited. The written permission of Cambridge University Press must be obtained prior to any commercial use and/or adaptation of the article.

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Fig. 1. — Pulsed-field gel electrophoresis of DNA of E. coli O7:H4 strains after treating with the restriction enzyme XbaI. Lanes: M, size marker; 1–14, strains from patient's faecal specimens; 15–16, strains from seaweed salad; 17, strain from red seaweed; 18, E. coli O7:H15 strain having no astA.