There is a vaccination you can buy however the government witheld it this year for some reason!
Nothing to do with the government. There were some problems with the production processes - it is a live vaccine and therefore is a bot more tricky to produce. We were lucky and got ours with no difficulty.
If you have a problem with toxo, initially it is a good idea to vaccinate all your ewes. In subsequent years, you would only need to vaccinate your ewes that are going to the tup for the first time and any ewes that you buy in. Needs to be adminstered AT LEAST a month before you put the rams in.
An alternative, if vaccine is not availible, are medicated feedblocks can be used. Tithebarn produce these, but you need to get a prescription from the vet for them.