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An outbreak investigation revealed eight concomitant cases of febrile gastroenteritis caused by<jats:italic>L. monocytogenes<\/jats:italic>on the same ward. Median age of the cases was 82 years and median incubation time for listerial gastroenteritis was 21 h (range 9\u2013107). An additional 10 cases of invasive listeriosis caused by the same outbreak strain were identified across the whole country during the summer of 2012. Environmental investigation at the affected municipal hospital ward revealed ready-sliced meat jelly as the suspected source of the infection. During inspection of the meat jelly production plant, one pooled sample taken from a floor drain and a trolley wheel in the food processing environment was positive for the outbreak strain of<jats:italic>L. monocytogenes<\/jats:italic>. After the producer stopped the production of meat jelly, no further cases of listeriosis with the outbreak strain were identified via nationwide surveillance.<\/jats:p>","DOI":"10.1017\/s0950268815002563","type":"journal-article","created":{"date-parts":[[2015,10,23]],"date-time":"2015-10-23T09:48:22Z","timestamp":1445593702000},"page":"2732-2742","update-policy":"https:\/\/doi.org\/10.1017\/policypage","source":"Crossref","is-referenced-by-count":23,"title":["Outbreak of hospital-acquired gastroenteritis and invasive infection caused by<i>Listeria monocytogenes<\/i>, Finland, 2012"],"prefix":"10.1017","volume":"144","author":[{"given":"A.","family":"JACKS","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"A.","family":"PIHLAJASAARI","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"M.","family":"VAHE","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"A.","family":"MYNTTI","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"S.-S.","family":"KAUKORANTA","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"N.","family":"ELOMAA","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"S.","family":"SALMENLINNA","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"L.","family":"RANTALA","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"K.","family":"LAHTI","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"S.","family":"HUUSKO","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"M.","family":"KUUSI","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"A.","family":"SIITONEN","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"R.","family":"RIMHANEN-FINNE","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"56","published-online":{"date-parts":[[2015,10,23]]},"reference":[{"key":"S0950268815002563_ref21","doi-asserted-by":"publisher","DOI":"10.1016\/j.jinf.2010.08.007"},{"key":"S0950268815002563_ref20","doi-asserted-by":"publisher","DOI":"10.1086\/342582"},{"key":"S0950268815002563_ref8","unstructured":"Niskanen T , (eds). 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