I had never had any cases of cocci in all my years of goat keeping.....maybe just luck? Not sure if it was down to the very wet summer or something, but last summer was a nightmare for me. Within a week I lost two kids, and then two more a few weeks later. All were a picture of health, out in the fields, and then struck by scours.
Have moved goats now to other farm, but it taught me a lesson - treat the kids before it strikes. just because I had never had it, did not mean they wouldn't the following year.