The prevalence of sporadic genotypes was 4 to 5% on all three farms. monocytogenes genotypes detected were classified by persistence (defined as persistent if isolated from ≥3 samples during ≥6 months) and predominance (defined as predominant if >5% prevalence on at least one farm visit). monocytogenes varied more between farms in samples of MFS (13 to 48%) than in BTM (10 to 16%). monocytogenes was more prevalent in MFS (29%) than in BTM (13%) samples. ![]() monocytogenes occurred throughout the year in all sample types, and the prevalence in MFS increased significantly during the indoor season. monocytogenes were genotyped using pulsed-field gel electrophoresis. A total of 186 bulk tank milk (BTM), 224 milk filter sock (MFS), and 1,702 barn environment samples were analyzed, and isolates of L. ![]() The molecular epidemiology of Listeria monocytogenes was investigated in a longitudinal study of three Finnish dairy farms during 2013 to 2016.
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