Its in the soil,Its also in the dung which would could contaminate the grazed grass and maybe an opportunistic cut of silage (bale-the big risk owing to their type of fermentation being more suitable for multiplication of the bugs rather than less so in the clamp).I'm not convinced soil is the problem, unless it's been in the fermenting vat that is silage. My sheep have been wintered on roots for near 30 years, including youngstock that have been breaking their teeth. Plenty of times it's been wet and they will have been ingesting a lot of soil with their fodder. The only time I have ever seen it (before this one) was when they had access to silage that wasn't the greatest, and which, we later found out, someone had been forking the shitty stuff that had been pulled out and trod on, back on top of the bale.
If it was a problem from taking soil in, we'd have been having multiple cases every year.
Assuming a good diet mins and vits,another variable then would be the individuals susceptibility to the disease.
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