I really am confused about what causes rain rot. I have asked many people about that, and each answer was different.
*Some say it is a fungus that grows on pine trees. They say that when it rains, the fungus drips from the pine tree they are standing under and that it gos into a open wound. Now, this can be as small as a bug bite.
*Some others say that it's a bacteria that comes from the ground, and when they roll around, it gets, again, into a open wound, and infects them.
*Another has said that it's a virus, and can attack any horse.
*More have said the same thing as above, but that it attacks horses with lowered immune systems, then affects all other horses when they are in tip-top shape (Like white horses, lucky me).
So, I do not know what the TRUE answer is, RiosDad.
Who knows? maybe its all of the above or all of them combined.