That was used in the lab next to mine, to
test for rabies. I used a dark field microscope for the micro-
titer agglutination test that I did for Leptospirosis. That was an antibody test and was sensitive enough to tell the difference between a titer from vaccination and active infection, in horses, cattle, sheep, pigs, and dogs.
I got on the IGENEX site and that is the kind of lab I would LOVE to work at!