The specificity of a test is a property of the test itself, not of the circumstances in which it is applied. If a test has a 100% specificity, and you give it

The specificity of a test is a property of the test itself, not of the circumstances in which it is applied. If a test has a 100% specificity, and you give it a sample that has been contaminated with the virus, the fact that it registers a positive result is not an error.