Brucellosis is a rare bacterial disease that causes fevers to come and go.

Brucellosis is caused by specific bacteria that infects domesticated animals. It can be spread to humans through:

  • Drinking unpasteurized milk from infected cows, sheep, or goats
  • Eating dairy foods from infected cows, sheep, or goats
  • Inhaling the bacteria
  • Breastfeeding—passed from an infected mother to an infant
  • Sexual transmission
  • Tissue transplantation