Last fall I was going to have my goats tested for CAE and CL. My vet, who also has raised goats for many years, recommended that I not spend any money on CL testing because it is so unreliable.
I wish they would use different terms for CAE than positive and negative. As I understand it, the test does not actually test for the presence or existence of CAE. It only assesses the levels of antibodies. The antibodies are always present, and the levels may fluctuate. So, an animal can test negative for several years, then test positive for one year, and then return to testing negative.
I have not seen anywhere that there is evidence that the CAE virus is the only entity that can cause that particular antibody to be elevated.
It seems incongruous to say that an animal is "negative," when the antibodies are actually present, but the levels are below a certain number.
I have been told that years ago, the labs used to report the actual number. But some people started to use those numbers in advertising, so they no longer report the actual number.
I was in goats many years ago, and I saw what CAE goats were like. So, today, when I hear of a healthy (no symptoms of any kind) suddenly "converting" to being positive for CAE.
After seeing what animals look like that truly were affeted by CAE........EXCUSE my skepticism when I am told that a perfectly healthy animal that has been positive for several years suddenly "converts."
I worked for over 30 years in the medical field. A number one rule in assessing a patient........LOOK AT THE PATIENT!!!! Look at all the lab results, x-rays, tests, etc.......but interpret them in the light of the patient that you see in front of you.
It Seems to me that a lot of goat breeders are simply looking at a simple "label," and taking it as a declaration from God Himself. It is a lab test. It does not even actually check for the existence of the actual disease itself.
It may be the best tool we have at this point in time.....but it is just that.....a tool, IMO.
I will get off my soapbox now.