BTVPUR AlSap 8 Dosage and administration Shake gently immediately before use. Avoid bubble formation, as this can be irritating at the site of injection. It is recommended to use a multiject type vaccination system when larger dose presentations are used. Administer one dose of 1 ml subcutaneously according to the following vaccination scheme: Primary vaccination In sheep: one injection from 3 months of age. In cattle: two injections 1 month apart from 3 months of age. Revaccination The timing for administering booster vaccinations has not yet been established but it is recommended that animals are revaccinated at least 2 weeks before each risk period.