A Case of Bovine Botulism Caused by <i>Clostridium</i> <i>botulinum</i> Producing the D/C Mosaic Neurotoxin

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  • NAKAO Satoko
    Yaeyama Livestock Hygiene Service Center of Okinawa Prefecture
  • OKUMURA Naoko
    Okinawa Prefectural Institute of Animal Health
  • ARAKI Miho
    Chuou Livestock Hygiene Service Center of Okinawa Prefecture
  • AOKI Yuya
    Chuou Livestock Hygiene Service Center of Okinawa Prefecture
  • IWAGAKI Tsugumi
    Hokubu Livestock Hygiene Service Center of Okinawa Prefecture
  • UEZU Koichi
    Central Veterinary Clinic Chubu Branch Office, Okinawa Agricultural Mutual Aid Association

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  • D/Cモザイク型毒素を産生する<i>Clostridium</i> <i>botulinum</I> による牛ボツリヌス症の1例

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Abstract

<p>In October 2022, three heads of beef breeding cattle died after showing symptoms of astasia, drooling, ruminal motility arrest, cessation of defecation and hypothermia. Botulinum neurotoxin type D (BoNT/D) and the D/C mosaic neurotoxin gene were detected in the culture medium from the digestive tract contents of these affected cattle and crow feces in the barn. Necrotizing vasculitis in the rumen and heart was observed by histopathological examination. Based on the results of epidemiological surveys, clinical examinations and detection of BoNT/D, this case was diagnosed as bovine botulism caused by C. botulinum producing the D/C mosaic neurotoxin. The affected cattle were thought to have developed the disease by ingesting spores of C. botulinum in crow feces. To prevent the disease, the botulinum vaccination was given at the cattle farm, and the barns were covered with anti-bird nets. Cleaning and disinfection of barns is important to stop invasions by wild animals and prevent infection with the bovine botulism. </p>

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