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Traditionally, the identification of latent tubercular infection has always been performed by the cutaneous tuberculin test, also known as the Intradermal (Mantoux) test.
But any cattle on any of the affected farms which were showing a reaction to the Tuberculin tests would continue to be slaughtered.
Department of Agriculture has been regulating testing cows for tuberculosis, some states do not require pasteurization but permit the sale of milk from cows periodically certified by a veterinarian to have negative tuberculin tests findings and no evidence of disease.