TOWN OF STOCKTON, Wis. (AP) — An investigation is under way after 200 dead cows were found in a field in the Town of Stockton.

The Portage County sheriff’s office says the owner of the cattle has been working with a local veterinarian and it’s believed the animals died from the IBR/BVD virus. The virus can cause respiratory and reproductive problems.

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WSAW reports samples from the dead cows have been sent to Madison for testing.

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Authorities say there is no threat to humans or other animals.

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