>I have heard that AFB has become resistant to terramycin and that Tylan is the way to go.
Tylan is a very long lived chemical as opposed to terramycin. The AFB may have become resistant to terramycin, but my bet is the beneficial microbes have as well:http://www.bushfarms.com/beesfoursimplesteps.htm#ecologyhttp://www.bushfarms.com/beesmorethan.htm
And Tylan is only approved for use against terramycin resistant AFB.
>Anyway, Im just wondering what options I have for this stuff and what works best.
What works best is to never use any antibiotics. Even the experts are finally coming around to this. I've been using no antibiotics for the last 33 years.
>How about Fumagillian? Is this stuff for bees only or is the antibiotic again a common livestock treatment?
Fumagillan has been outlawed throughout the world because it causes birth defects. It is ONLY allowed in beekeeping and ONLY in the US, Canada and the UK. The EU, Australia and New Zealand have outlawed it. I have never used it in 35 years of beekeeping.http://www.bushfarms.com/beesterms.htm#fumidil