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This microorganism is capable of forming biofilm on different surfaces such as steel, glass, polypropylene etc. Recently an increase in cases of listeriosis has been noted, making <jats:italic>L. monocytogenes<\/jats:italic> the important health threat. Therefore, there is a need for rapid and sensitive detection of this pathogen. This study aimed to compare the number of <jats:italic>L. monocytogenes<\/jats:italic> cells recovered from the biofilm (prepared on steel and polypropylene) using the detection and amplification of the <jats:italic>hlyA<\/jats:italic> gene (droplet digital PCR, ddPCR) and the classical culture method. The research material consisted of 96 <jats:italic>L. monocytogenes<\/jats:italic> strains. A total of 58 isolates were obtained from clinical samples and 38 isolates derived from the municipal sewage treatment plant. Additionally, the reference strain ATCC<jats:sup>\u00ae<\/jats:sup>19111\u2122 (WDCM00020) was used. The Pearson correlation coefficient for the results obtained by the classical culture-based method and ddPCR was 0.864 and 0.725, for biofilms produced on AISI 304 stainless steel surface and the polypropylene surface, respectively. Correlations were statistically significant (p\u2009\u2264\u20090.001), indicating that the ddPCR technique is an effective tool for the assessment of bacteria number in the biofilm.<\/jats:p>","DOI":"10.1186\/s13568-020-01007-5","type":"journal-article","created":{"date-parts":[[2020,4,17]],"date-time":"2020-04-17T12:02:34Z","timestamp":1587124954000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":18,"title":["Comparison of the intensity of biofilm formation by Listeria monocytogenes using classical culture-based method and digital droplet PCR"],"prefix":"10.1186","volume":"10","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5730-940X","authenticated-orcid":false,"given":"Katarzyna","family":"Grudlewska-Buda","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Krzysztof","family":"Skowron","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Eugenia","family":"Gospodarek-Komkowska","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2020,4,17]]},"reference":[{"key":"1007_CR1","doi-asserted-by":"publisher","first-page":"251","DOI":"10.1111\/j.1365-2672.1986.tb01080.x","volume":"60","author":"MR Al-Ghazali","year":"1986","unstructured":"Al-Ghazali MR, Al-Azawi SK (1986) Detection and enumeration of Listeria monocytogenes in a sewage treatment plant in Iraq. 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