19. If the owner or occupier of any premises, vessel or aircraft on whom an order made under section 18 has been served fails to comply with the terms thereof, the Commissioner or a public health officer may —
(a)
enter such premises, vessel or aircraft with such assistants and things as are necessary; and
(b)
perform and do such acts and things as are necessary or as are required by the order to be performed or done and recover the costs and expenses thereof, if any, from the owner or occupier of the premises, vessel or aircraft.