What is the response rate to a comparative cervical test (CCT) in bovine tuberculosis?

The response rate to a comparative cervical test (CCT) in bovine tuberculosis generally falls within the range of 1-5%. This figure is significant as it indicates the proportion of cattle that will show a positive reaction to the test, which is used to detect Mycobacterium bovis infection. The CCT is considered a specific diagnostic tool, often employed after an inconclusive result from a standard tuberculin skin test.

Understanding this response rate is crucial for interpreting testing results and managing herd health, especially in controlling the disease. A lower response rate reflects the specificity of the test and the difficulty in detecting all infected animals. It also indicates the importance of follow-up testing and enhanced biosecurity measures in herds where bovine tuberculosis may be suspected or present. This low response rate can vary depending on factors such as the sensitivity of the test, the population of cattle being tested, and the prevalence of the disease in that population.