Brucellosis is a bacterial disease that affects livestock and wildlife, sometimes causing cattle to abort their first calf post-infection. While abortions have been documented in wild buffalo, such incidents are rare, and the impact of the disease on Yellowstone buffalo and elk is insignificant. Brucellosis, which originated in European livestock, was first detected in Yellowstone's buffalo in 1917 after some buffalo were fed milk from infected cows. Learn more about brucellosis.
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