101. (1) The Chief Health Officer may, if he or she considers it to be necessary or desirable in the interests of public health, by instrument declare—
(a) a disease or medical condition to be a notifiable condition; and
(b) a disease referred to in paragraph (a) of this subsection, or paragraph 100 (1) (a), to be a transmissible notifiable condition.
(2) A declaration under subsection (1)—
(a) comes into force on the day on which it is made, or on a later date specified in the declaration; and
(b) remains in force for a period specified in the notice of not longer than 6 months.
(3) A declaration under subsection (1) is a disallowable instrument for the purposes of section 10 of the Subordinate Laws Act 1989 .