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Retrospective study of oral necrobacillosis in 54 swamp wallabies
  1. N. Kido, DVM, DipJCZWM1,
  2. A. Chikuan, BSc1,
  3. T. Omiya, DVM1,
  4. M. Dan, DVM1 and
  5. M. Nomura, DVM1
  1. 1Nogeyama Zoological Gardens,
    63-10, Oimatsu cho, Nishi ku, Yokohama, Kanagawa 220-0032,
    Japan
  2. 2Yokohama Zoological Gardens, 1175-1, Kamishirane cho, Asahi ku, Yokohama, Kanagawa 241-0001, Japan
  1. Email for correspondence: kido{at}hama-midorinokyokai.or.jp

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Oral necrobacillosis (lumpy jaw) is known as one of the most common and significant diseases in captive macropods (Vogelnest and Portas 2008). The most important pathogen is the anaerobic bacteria, Fusobacterium necrophorum (Samuel 1983). Many studies have shown dental calculus as one of the risk factors for oral necrobacillosis, oral injury, feed contaminated with faeces, adverse environmental conditions, and molar exfoliation (Butler 1981, Oliphant and others 1984, Vogelnest and Portas 2008). In the present study, we conducted a retrospective study to reveal recurrence and evaluate the risk factors in swamp wallabies that presented with oral necrobacillosis. We showed that oral necrobacillosis recurred in all cases after apparent complete recovery, and that advanced age and cold weather were the contributing risk factors.

Seventy-five swamp wallabies were housed at the Nogeyama Zoological Gardens from 1987 to 2011. For this retrospective study, we selected 54 individuals for which clinical records had been maintained from birth to death.

The average age at the onset of the first lesion was examined. Further, the number of diseased individuals and the rate of diseased swamp wallabies were counted and calculated, respectively, at each age.

The location(s) and number of lesion(s) were counted and analysed in each month, which also included recurrence cases. The average temperature of …

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