Just started my feb born lambs . First field of 30 ewes plus lambs fine but today done another batch of 30 and quite a few lambs have orf to some degree . Still another 3 batches to dose but hoping this isn’t going to be a big problem. I have scratched them all for orf with scabivax at no more than 3 days old . Used scabivax for years and didn’t have orf . As it’s one particular field at moment they would have been going out almost at same time so probably using same bottle to do the lambs . I’m wondering if a bottle was no use. Kept in fridge etc I know it says use within 48 hours or something but it will be bit longer as not enough lambs been born to keep up . Anybody else seeing problems ?