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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
The sample size (=number of slugs) required to detect at least one infected slug, given true prevalence from 1% (n = 299) to 25% (n = 11). Higher prevalence omitted for clarity: n declines further to 5 (at 50% prevalence) and 3 (75%).