18. When an order in council is made under section 17, the Minister may:(a) order the closing or opening of any institution, educational institution or meeting place;
(b) prohibit entry into or exit from a territory;
(c) order the compulsory immunization of certain groups of the population;
(d) take any other step and order any other thing he considers expedient for the protection of public health or the health of certain groups that he identifies.