The IM strangles shot itself has a lot of associated risk. If you do decide to vaccinate for strangles, do the Intra Nasal vaccine. If its the first time you will probably need to do a booster as well, and make sure you give the IN vaccine after any shots as if there is any vaccine floating through the air, it can attach to a needle and have the same consequences as the IM vaccine. Namely a nice big abcsess that when drained can infect other horses (and yours) with strangles.
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