Asian longhorned ticks and bovine anemia: A dangerous connection

Asian longhorned ticks and bovine anemia: A dangerous connection


Asian longhorned ticks are swarming the United States, many carrying blood parasites that cause bovine theileriosis [tī-leer-ē-Ō-sus] — or bovine anemia.

Along with red blood cell destruction, theileriosis in cattle can cause fever, jaundice and diarrhea. Abortions and stillbirths are common, too. Fortunately, many cattle are asymptomatic but some get very sick and can die. Calves are especially vulnerable.

The only treatment is supportive care. Preventative measures include boosting nutrition, managing pastures and controlling ticks.

That’s a challenge. Most Asian longhorned ticks in the U.S. are females that don’t need mates to reproduce. The result is a tick explosion — you might find 10 on a single blade of grass. What’s more, fields can remain contaminated for up to two years.

So, it’s not too early to address prevention — especially before calving season.

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