Dodgy CL results-- Advice?

[Dave-Trinity-Farms]

We did it years ago on the farm I worked on. The vaccine is a little better now but aside from a reduction in chronic animals growing abscess, we saw no notable effect. Clean animals still come up positive. On many the reaction at the shot site was bad. We have all seen vaccination abscess. Thats common but the reaction from the CL vaccine was much worse and most of the time ended up causing large abscess that had to be lanced.