I have had a little scald, How does footvax work? Is it a single dose yearly?
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Scald starts with infection by Fusobacterium necrophorum. When this initial damage is invaded by dichelobacter nodosus full blown footrot is the result. We trimmed the feet, dipping the footshears in iodine between each foot, then vaccinated and moved the sheep onto fresh pasture. 16 days later we checked the feet again and moved them onto fresh pasture again. Job done! We do run a closed flock and treat and quarantine incoming rams and so have never needed to repeat vaccinating. Only thing I'd do differently is to vaccinate after the flies have died off, as the oil adjuvant caused irritation to the young ewes and they rubbed the site raw and we had to gather them and spray the wound every couple of days for a fortnight.