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Statistical data on tetanus?

 
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I'm planning to band lambs for the first time this year to improve pasture management and all of "the books" say that you absolutely must vaccinate the ewes against tetanus or provide anti-toxin to the lambs.  

Yet I can't find any data on the risk of tetanus.  It's supposed to be very high.  What does that mean?  

I don't want an animal to suffer unnecessarily but as my other occasional posts on here have made clear, the livestock is here to do a job.  There is scientific literature on natural immunity to tetanus (in humans) despite the common medical myth that this is impossible.  I certainly get my tetanus boosters because the risk isn't worth it.  But it might be with lambs.  Vaccinating the flock would be a huge job.  Is my probable risk losing a lamb or so every few years?  In that case it's not worth it.  Or is it losing 30 percent every year?  In that case it's definitely worth it.  I just want to see data.  We've never had a case of tetanus in the flock before and we do use ear tags, so there's some risk there.
 
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I think it's going to be hard to find hard data for sheep-- tetanus is a reportable disease in humans, but nobody is obliged to report anything in animals.

I did find some USDA APHIS white paper type surveys about biosecurity and vaccination, reporting the percentage of farmers that are vaccinating their sheep for various things, and which kind of stock (rams, ewes, etc) they are vaccinating. Not losses, but vaccinations.

I also read that since 2018 there have been shortages of sheep vaccinations, which means people are probably not vaccinating as much. If it were me, I'd ask the vet how prevalent tetanus is in the area (maybe other farmers too?), maybe that will give you an idea of whether it's worth it or not.
 
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This site seems to explain a lot Sheep and goat vaccines

"Do sheep need tetanus shots?
The most important vaccines given routinely to sheep and lambs in North America are those used to protect against Clostridial diseases. Specifically, the preferred vaccine is CD-T toxoid. This protects against enterotoxemia caused by Clostridium perfringens types C and D and also tetanus caused by Clostridium tetani.10 July 2020"
and
"The relatively low economic value of small ruminants places constraints upon vaccination in these species. In general, vaccination against clostridial diseases such as enterotoxemia and tetanus are most important."
 
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