It really does make me wonder where those two goats got CL. Supposedly it is only spread by direct contact to the puss, but let's say a goat has CL in its lungs...could it pass it by sneezing or coughing? Could a goat conceivably pass it by saliva? In the show world vet checks are done, but only for visible signs, no one seems to worry about CL being internal.
My two goats were bought before I ever even heard of CL. I tested because a doe and my wether both presented a small lump under the ear, the vet was sure it was CL. It wasn't; the lump went away without ever becoming an abscess. That doe tested <8 but her two sisters are the ones that tested 8 and 16 at the time; now 16 and 32. But the one that was 16 is still 16, and at testing year two the one that is 16 had gone down to 8 and now back up to 16. I give up. Who knows if they really have CL or not?
They say that testing every year can give you an overall picture of the state of the disease, but it has been my experience that the titers fluctuate. Also testing while the doe is bred can give higher titers as their immune system is depressed during pregnancy.
If I ever get to do the raw milk dairy I will not milk any goats that are >8. End of story, but for now as long as the titers stay below 128 and no abscess I won't sweat it.
Also, if you ever vaccinate you will get a + titer, but I have been told that it should go down every year...IDK, I don't vaccinate. A lot of my meat goat friends do and then you never know what you are truly buying. I am very careful where my meat goats come from, and I do test them no matter what the breeder says.
While it can be an annoying disease they are worse...IMO. You just need to use some common sense to be safe around it in case it is zoonotic; again, JMHO.