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Prevalence and Characteristics of Listeria monocytogenes in Bovine Colostrum in Japan

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Abstract:

This study was conducted to determine the prevalence and characteristics of Listeria monocytogenes in bovine colostrum in Japan. We collected bovine colostrum samples from 210 dams from 21 dairy farms in Hokkaido prefecture (Japan) between March and June 2009. L. monocytogenes was detected in samples from 6 (28.6%) of the 21 farms. Of the 210 samples, 16 (7.6%) were positive for L. monocytogenes. We recovered 80 L. monocytogenes isolates; 44 (55%) isolates were classified as serotype 1/2b and 36 (45%) were classified as serotype 4b. The isolates were susceptible to penicillin, ampicillin, amoxicillin, gentamicin, kanamycin, streptomycin, erythromycin, vancomycin, tetracycline, chloramphenicol, ciprofloxacin, and trimethoprim-sulfamethoxazole. Pulsed-field gel electrophoresis (PFGE) characterization of the 80 isolates revealed six PFGE types. Two PFGE types corresponded to human listeriosis cases. Most L. monocytogenes isolates possessed virulence-associated genes (actA, hly, iap, inlA, inlC, mpl, plcA, plcB, opuCA, prfA, and clpC). One PFGE type isolate possessed an epidemic clone II marker. Our findings suggest that isolates from bovine colostrum have the potential to cause human and animal listeriosis. This is the first study on the prevalence and characteristics of L. monocytogenes isolated from bovine colostrum obtained from dairy farms. Our results have important implications for improving public health and elucidating the epidemiology of L. monocytogenes in bovine colostrum.

Document Type: Research Article

DOI: http://dx.doi.org/10.4315/0362-028X.JFP-12-278

Affiliations: 1: Department of Nutrition, School of Nursing and Nutrition, Tenshi College, Higashi-ku, Sapporo, Hokkaido 065-0013, Japan;, Email: hasegawa@tenshi.ac.jp 2: Department of Nutrition, School of Nursing and Nutrition, Tenshi College, Higashi-ku, Sapporo, Hokkaido 065-0013, Japan 3: Research Institute for Animal Science in Biochemistry and Toxicology 3-7-1, Hashimotodai Midori-ku, Sagamihara, Kanagawa 252-0132, Japan 4: Daiichi Clinical Laboratories Inc., 9-1 Kita-5, Nishi-18, Chuou-ku, Sapporo 060-0005, Japan 5: Sapporo Clinical Laboratory Inc., 3-5-10 Fushiko-7, Higashi-ku, Sapporo 065-0013, Japan

Publication date: February 1, 2013

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    First published in 1937, the Journal of Food Protection®, is a refereed monthly publication. Each issue contains scientific research and authoritative review articles reporting on a variety of topics in food science pertaining to food safety and quality. The Journal is internationally recognized as the leading publication in the field of food microbiology with a readership exceeding 11,000 scientists from 70 countries. The Journal of Food Protection® is indexed in Index Medicus, Current Contents, BIOSIS, PubMed, Medline, and many others.

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