Correlation of Age with Distribution of Periodontitis-Related Bacteria in Japanese Dogs

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  • HIRAI Norihiko
    Department of Pharmacology, School of Veterinary Medicine, Azabu University, Sagamihara, Kanagawa 252–5201, Japan
  • SHIRAI Mitsuyuki
    Department of Pharmacology, School of Veterinary Medicine, Azabu University, Sagamihara, Kanagawa 252–5201, Japan
  • KATO Yukio
    Department of Veterinary Public Health II, School of Veterinary Medicine, Azabu University, Sagamihara, Kanagawa 252–5201, Japan
  • MURAKAMI Masaru
    Department of Molecular Biology, School of Veterinary Medicine, Azabu University, Sagamihara, Kanagawa 252–5201, Japan
  • NOMURA Ryota
    Department of Pediatric Dentistry, Osaka University Graduate School of Dentistry, Suita, Osaka 565–0871, Japan
  • YAMASAKI Yoshie
    Department of Pediatric Dentistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama 700–8556, Japan
  • TAKAHASHI Soraaki
    Department of Pharmacology, School of Veterinary Medicine, Azabu University, Sagamihara, Kanagawa 252–5201, Japan
  • KONDO Chihiro
    Department of Pharmacology, School of Veterinary Medicine, Azabu University, Sagamihara, Kanagawa 252–5201, Japan
  • MATSUMOTO-NAKANO Michiyo
    Department of Pediatric Dentistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama 700–8556, Japan
  • NAKANO Kazuhiko
    Department of Pediatric Dentistry, Osaka University Graduate School of Dentistry, Suita, Osaka 565–0871, Japan
  • ASAI Fumitoshi
    Department of Pharmacology, School of Veterinary Medicine, Azabu University, Sagamihara, Kanagawa 252–5201, Japan

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We analyzed the distribution of 11 periodontitis-related bacterial species in dental plaque collected from 176 Japanese dogs divided into young (less than 2 years of age), middle-aged (2–7 years of age) and elderly (more than 8 years of age) groups using a polymerase chain reaction method. Clinical examination revealed that no dogs in the young group were affected by periodontitis, whereas the rates for gingivitis and periodontitis were high in the middle-aged and elderly groups. In addition, the total numbers of bacterial species in the middle-aged and elderly groups were significantly greater than in the young group. Our findings suggest that age is an important factor associated with the distribution of periodontitis-related bacteria and periodontal conditions in dogs.

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