若齢肥育牛群に発生したサルモネラ症について

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タイトル別名
  • An Occurrence of <I>Salmonella typhimurium</I> Infection in Growing Cattle
  • ジャクレイ ヒイクギュウグン ニ ハッセイ シタ サルモネラショウ ニ ツイテ
  • An Occurrence of Salmonella typhimurium Infection in Growing Cattle

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In spring and early summer in 1968, Salmonella typhimurium infection occurred in a herd of growing dairy cattle consisting of 118 calves and 16 cows in Fukui Prefecture. More than half the animals of the herd suffered from diarrhea. Main clinical signs were anorexia, depression, slight weakness accompanied by fetid, whitish-yellow, watery diarrhea' Insome cases, blood and mucus were contained in feces. All the animals recovered from the disease, except ten calves less than 20 days old which died within several days after clinical manifestation.<BR>Postmortem examination revealed that the small intestine was dilated and filled with large amounts of milky and whitish-yellow contents. The wall of the small intestine was remarkably thinned out. Swelling of the mesenteric lymph nodes, and mild cloudy swelling of the liver and kidney were also observed.<BR>Histological findings were characterized by catarrhal enteritis with necrosis of the mucous membrane of the small intestine, activation of the reticuloendothelial system, and focal necrosis of the liver. Thrombosis which included a bacterial mass was recognized in small blood vessels in many organs.<BR>Salmonella typhimurium was isolated from the liver, spleen, mesenteric lymph nodes, and intestinal contents of a dead calf, and from the rectal feces of 14 animals (11.3%) out of 124.<BR>The Widal reaction was carried out on sera of all the animals of the herd, by using an antigen prepared. from Salmonellatyphimurium isolated from the mesenteric lymph nodes of a dead calf. As a result, 1: 80 or higher titers were given by about 23% of the tested animals. It was noticed that highly positive reactors were among animalswhich had already recovered from the disease.

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