There has been a breakout of Strangles at many local barns but not yet at the barn my horses are at. My horses were vaccinated last spring for Strangles but not this spring yet, our barn had the vaccine coming up pretty soon when everybody does it at the same time.
But I have heard that you should not vaccinate during a breakout because if your horse has any symptoms to the vaccine you won't be able to tell if he is actually sick or not.
I usually vaccinate early If I hear of an outbreak at a nearby barn. So far it has never let me down but some people thing thats a terrible idea, as well as my BM but she's the one with strangles and my horses are the vaccinated ones.
edit- I just thought I'd say that if a horse at the barn has strangles? I do NOT vaccinate because they are kept in such close proximity, I'd hate to have my horse catch it and me not know.
I just read the the muscular shot of Strangles is INCREDIBLY dangerous and most horses actually contract strangles from it. I didn't even know there was a muscular shot of a Strangles vaccine. I've always done it inter nasally.