5. The dosage of diphtheria prophylactic to be administered and the route of administration in respect of primary diphtheria vaccination and booster diphtheria vaccination shall be —
(a)
in the case of the diphtheria prophylactics set out in the First Schedule, as specified in that Schedule; and
(b)
in the case of other approved diphtheria prophylactics, in accordance with the directions given by the manufacturer of the respective diphtheria prophylactics used.