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To investigate the immune\u2010enhancing properties of JWS 833, production of nitric oxide (NO) and cytokines was measured in mouse peritoneal macrophages. In addition, a <jats:italic>Listeria monocytogenes<\/jats:italic> challenge model was used in the assessment. It was found that heat\u2010killed JWS 833 stimulates mouse peritoneal macrophages to produce NO, interleukin\u20101 \u03b2 (IL\u20101\u03b2) and tumor necrosis factor\u2010\u03b1 (TNF\u2010\u03b1) and that oral administration of viable JWS833 enhances NO, IL\u20101\u03b2 and TNF\u2010\u03b1 synthesis upon <jats:italic>L. monocytogenes<\/jats:italic> challenge. Moreover, mice fed with JWS 833 were partially protected against lethal challenge with <jats:italic>L. monocytogenes.<\/jats:italic> JWS 833 strain has significantly greater immunostimulatory properties than LGG. Moreover, JWS 833 strain partially protects mice against lethal challenge with <jats:italic>L. monocytogenes<\/jats:italic>. JWS 833, a novel strain of <jats:italic>E. faecium<\/jats:italic> isolated from duck intestine, is potentially a useful feed supplement for controlling pathogens and enhancing host immune responses.<\/jats:p>","DOI":"10.1111\/j.1348-0421.2012.00486.x","type":"journal-article","created":{"date-parts":[[2012,6,18]],"date-time":"2012-06-18T19:41:46Z","timestamp":1340048506000},"page":"613-620","source":"Crossref","is-referenced-by-count":27,"title":["Immunomodulatory properties of <i>Enterococcus faecium<\/i> JWS 833 isolated from duck intestinal tract and suppression of <i>Listeria monocytogenes<\/i> infection"],"prefix":"10.1111","volume":"56","author":[{"given":"Hyun Jong","family":"Choi","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Myeong Su","family":"Shin","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sang 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