1. Research Center for Food Safety, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-8657, Japan
2. Department of Microbiology, School of Pharmacy, Aichi-gakuin University, 1-100, Kusumoto-cho, Nagoya-shi, Aichi-ken 464-8650, Japan
3. Sendai-City Institute of Public Health, Oroshimachihigashi 2-5-10, Wakabayashi-ku, Sendai-shi, Miyagi-ken 984-0002, Japan
4. Meat Inspection Center of Sendai-City, Ohgimachi 6-3-6, Miyagino-ku, Sendai-shi, Miyagi-ken 983-0034, Japan
5. Department of Infectious Diseases, Tokyo Women’s Medical University, Kawada-cho 8-1, Shinjuku-ku, Tokyo 162-8666, Japan