Newport can tell you more about this himself, but I was reading old posts on CZ and came across some of his about finding A. Vasorum (Angiostrongylus Vasorum)in vertebraes in his spine that had been problem areas for some time. (SCIO test)
You can read old posts about it if you put in a CZ search for A Vasorum, but I never would have connected vertebrae issues with heart worm until I read them.