A cull of animals hit by an outbreak of bovine tuberculosis is scheduled to take place this week.
Workers who were in contact with the herd will be screened for TB
At least 70 cows from a dairy herd at a farm in Gretna will be slaughtered.
More tests are being carried out to determine if the rest of the herd - about 200 animals - will have to be destroyed.
The farmer involved is to be fully compensated. The Scottish Executive said there were no health risks to the general population.
The "significant outbreak" was described by the executive as Scotland's largest case of bovine TB in a single dairy herd.
The disease was identified on 4 August by Buitelaar abattoir in Kilmarnock, when four infected carcasses were found.
A follow-up examination of the herd found a further 60 positive tests and 11 inconclusive tests.
All of the animals belonged to Neil Conaghan of West Scales, Rigg, Gretna.
The executive said cases of bovine TB in humans were rare and that any farm workers who were in contact with infected animals would be assessed.