Two horses were quarantined at a farming college in Burchetts Green at the weekend.
Staff at Berkshire College of Agriculture (BCA) were forced to cancel a showjumping event for 200 pony riders on Sunday and a carriage driving qualifier for 50 competitors on Saturday after the animals fell ill.
A vet attended and diagnosed the horses as suffering from a 'mild cold' type illness.
A spokesman for BCA stressed the illness was of 'little significance' and the animals were quarantined as a precaution.
She said there was no link to the Schmallenberg virus, which has been killing new-born lambs across South-east England, or the more serious equine strangles disease.
BCA, in Hall Place, has since been given the all clear and is back to business as usual.
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