Which model is used for diagnosing Tuberculosis (Tb) in cattle?

The caudal fold test is a commonly used method for diagnosing Tuberculosis (Tb) in cattle. This test involves the intradermal injection of a purified protein derived from the bacteria that cause bovine tuberculosis, specifically Mycobacterium bovis. After a specified period, usually 72 hours, the injection site is examined for swelling or an immune response, which indicates a positive reaction to the tuberculosis antigens present in the injected material.

This method is essential for controlling and eradicating Tb in cattle populations, as it allows for the identification of infected animals, which can then be removed from the herd to prevent further spread of the disease. The caudal fold test is effective, relatively simple to administer, and has been standardized for use in cattle, making it a reliable choice in veterinary medicine for Tb diagnosis.

While other options like radioimmunoassay, purified protein derivative, and skin tests have relevance in different contexts, they are not specifically established tests for diagnosing tuberculosis in cattle.