Which test is commonly used for diagnosing Tuberculosis (Tb)?

The caudal fold test is a common method for diagnosing Tuberculosis (Tb) in animals, particularly in cattle. This test involves the intradermal injection of a tuberculin antigen into the skin of the animal's tail. If the animal has been exposed to the bacteria causing Tb, an immune response will result in a detectable swelling at the injection site within a few days. This reaction indicates a positive test and suggests the presence of the disease.

While other methods like PCR tests, skin sensitivity tests, and chest X-rays are relevant in different contexts for diagnosing tuberculosis in humans or other purposes, the caudal fold test is specifically tailored for use in certain animal populations. Hence, the focus on this method for the purpose of diagnosing tuberculosis in specific animal species highlights its relevance in veterinary medicine and the importance of proper testing protocols to ensure disease management and control.