Hi Anna, in re <aviare is for particularly delicate subjects>: years ago I had a couple of doses (a few months apart) of Tub Bov 200c. It didn't do much although the remedy was very well indicated. Some years after that I was given a single dose of Aviare 200c. I had a terrible and very, very long-lasting aggravation that no one was able to either anti-dote or find the correct remedy for. I've never been the same since. Needless to say, I wouldn't touch Aviare with a 10-foot pole, but I would also like to learn more about the diff betw. koch, bov, bac, b.c.g. and aviare. In the A.O. Julian MM, b.c.g. is described as being as important as bov and koch, but American literature doesn't seem to give much info on b.c.g.