Outbreaks of Fowl Cholera in Muscovy Ducks (Cairina moschata) on a Farm in Aomori Prefecture

[摘要] References(18)Outbreaks of a subacute disease characterized by lameness, corneal turbidity, dysstasia and depression occurred in Muscovy ducks (Cairina moschata) on a farm in Aomori Prefecture in February and May 1991. Nine strains of Pasteurella multocida were isolated from 5 of 6 dead ducks, and 4 of 8 ducks with clinical signs. Serotypes of the isolates were identified as Heddleston's serotypes 1, 10 or 12 and Namioka's serotypes 5:A, 8:A, 9:A or 9:UT. These isolates were highly susceptible to 12 antibiotics, although, some of them were considerably resistant to chloramphenicol. Mouse LD50 values of the 9 isolates ranged from 101.0 to 105.3. The most virulent strain for the mouse killed 2 of 4 ducks when inoculated intramuscularly at a concentration of 103.3. This is the first report of outbreaks of fowl cholera in Muscovy ducks infected with various serotypes strains of P.multocida in Japan.

[学科分类] 兽医学

[关键词] fowl cholera;Muscovy duck;Pasteurella multocida