下痢を呈する新生子牛における菌血症の特徴:症例対照研究
Luiza S Zakia1,2, Diego E Gomez3, Peter D Constable4
1Department of Population Medicine, Ontario Veterinary College, University of Guelph, Guelph, ON N1G 2W1, Canada.
Journal of veterinary internal medicine
|February 26, 2026
まとめ
下痢を呈する子牛の37%が菌血症の影響を受けている。強膜充血や眼球陥没などの臨床兆候、および低アルブミン血症や赤血球分布幅(RDW)の異常は、感染した子牛の特定に役立つ可能性がある。
科学分野:
- 獣医学
- 新生子牛の健康
- 感染症診断
背景:
- 新生子牛の菌血症は、迅速な抗菌療法を必要とする全身性感染症を示す。
- 早期発見は、若齢牛における効果的な治療と予後の改善のために不可欠である。
研究 の 目的:
- 新生子牛の下痢における菌血症の有病率を決定すること。
- 商業的環境における臨床変数および血液変数と菌血症との関連を調査すること。
主な方法:
- 下痢を呈する100頭の新生子牛を対象とした症例対照研究。
- 菌血症の検出には血液培養を使用した。
- 変数間の関連を評価するために、Exact conditional logistic regressionおよびclassification and regression tree (CART) analysesを採用した。
主要な成果:
- 菌血症の有病率は37%であり、Streptococcus ruminantiumとEscherichia coliが最も一般的な病原体であった。多変量解析により、低重炭酸イオン(HCO3-)および低アルブミン濃度が菌血症のオッズ低下と関連することが明らかになった。強膜充血は菌血症のオッズを有意に増加させ、CART分析では低心拍数、眼球陥没、低単球数、および低赤血球分布幅(RDW)が主要な予測因子として特定された。
- 菌血症の有病率は37%であり、Streptococcus ruminantiumとEscherichia coliが最も一般的な病原体であった。多変量解析により、低重炭酸イオン(HCO3-)および低アルブミン濃度が菌血症のオッズ低下と関連することが明らかになった。強膜充血は菌血症のオッズを有意に増加させ、CART分析では低心拍数、眼球陥没、低単球数、および低赤血球分布幅(RDW)が主要な予測因子として特定された。
結論:
- 強膜充血、直腸温上昇、眼球陥没、および電解質異常などの臨床指標は、菌血症の特定に価値がある。
- RDWおよびアルブミン濃度の低下も、下痢を呈する新生子牛の菌血症と関連している。
- これらの発見は、新生子牛における全身性感染症の早期診断と管理に役立つ。
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