By Jackie Ourada
County fairs and livestock shows are ramping up this summer as several cattle illness threats are starting to emerge in Nebraska and other states. Livestock experts aren’t raising alarm about increased spread, but they are encouraging livestock owners to pay more attention this year to biosecurity efforts and the movement of their animals.
Two threats have emerged over the last several months: the rise in a tick-born disease called Theileria and the return of a flesh-eating parasite called the New World Screwworm.
At least 10 feedlots and three breeding herds have reported cases of imported cattle having Theileria. The disease is caused by the Asian longhorn tick, most commonly found on the East Coast. The tick itself hasn’t been found in Nebraska, but the disease can be spread further by reusing needles with an infected animal or through other blood-sucking organisms such as lice. The symptoms include anemia, jaundice, loss of appetite, exercise intolerance and weakness. In some cases, the disease can be fatal.
Cattle owners have been closely watching the spread of the New World Screwworm. It wreaked havoc on U.S. herds decades ago, but it was eradicated from the country in the 1960s. Cases started appearing in Texas in early June, and cattle owners in neighboring states have assumed that the parasite will eventually spread north. The screwworms lay eggs in the flesh of live animals, which can cause infections, disease and death if left untreated.
Nebraska Extension said early detection of the parasite is “critical for successful control efforts.” Possible early signs of New World Screwworm infections include non-healing wounds, depression or restlessness, foul-smelling lesions, presence of maggots in living tissue and animals showing pain or discomfort. They could show this behavior through shaking their heads or showing pain or irritation around wounds.
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