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New Cattle Disease Detected in Iowa

  • The Iowa Department of Agriculture has reported the state's first instance of Theileriosis affecting a cattle herd in southeastern Iowa, linked to the recent detection of the Asian Longhorned Tick in the area.
  • Theileriosis is caused by the parasite Theileria orientalis Ikeda, which infects blood cells and is spread by the recently detected Asian Longhorned Tick, as the tick slowly spreads westward from eastern states.
  • Affected cattle may display symptoms such as weakness, anemia, labored breathing, swelling on the lower body, reduced capacity for physical activity, yellowing of tissues, and pregnancy losses; these signs tend to be more pronounced in younger animals compared to adults.
  • Cattle producers are encouraged to vigilantly manage tick infestations by employing insecticide ear tags in combination with insecticide-treated backrubbers or regular pour-on applications, and to consult a veterinarian for diagnostic testing if Theileriosis or tick problems are suspected, while noting that these parasites do not pose a threat to human health.
  • Officials warn that tick activity, especially in southern Iowa where many cattle have been recently turned out to pasture, will likely increase this summer with ticks expected to spread north, potentially leading to severe cattle health impacts.
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KGAN broke the news in on Monday, June 16, 2025.
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