I feel that prevention is the most important factor. Make sure your
horses get that once a year. As far as I know, Strangles spreading can be
caused by flys landing on snot and then going to another horse. Transfer of
using the same water is only one of the ways. You as a handler can transfer
Strangles also. So unless your stable is fly free, the chances of transfer
is pretty good. Horses can die from internal types of Strangles. And this
is a fact!