Dr. John Griffin:

No. The blood test is not 100%. If they are done correctly, both the blood test and the skin test will identify about 80%. The blood test might be slightly better but the problem with the blood test is that it will pick up a lot of false positive animals. There will be quite a number of false positive animals with the blood test. That is why it cannot be used as a screening test. It is because we get too many false positives.