What is the expected response rate for Caudal Fold testing in the TB program?

The expected response rate for Caudal Fold testing in TB programs is indeed very low, typically around 1-2%. This rate reflects the specific population of animals or individuals being tested, and it accounts for the inherent challenges in detecting tuberculosis early using this method. Caudal Fold testing is often used in veterinary contexts, particularly among cattle, as it measures the immune response to a tuberculosis antigen introduced at the caudal fold of the tail.

Low response rates can occur due to factors like the sensitivity of the test, the stage of infection, and whether the animals are asymptomatic. It's important to understand that while this method can be part of a broader surveillance program, the response rate highlights the limitations of relying on this single test for a definitive diagnosis of tuberculosis. Therefore, the correct response rate of 1-2% reflects the realistic outcomes expected from such testing, especially in populations where tuberculosis may not be prevalent.