Public Health Act 1997

The chief health officer may declare—

a disease or medical condition to be a notifiable condition; and

a disease mentioned in paragraph (a) or section 100 (1) (a) to be a transmissible notifiable condition.

However, the chief health officer must not make a declaration under subsection (1) unless the chief health officer believes, on reasonable grounds, that the declaration is necessary to protect public health.

A declaration under subsection (1)—

commences—

on the day after its notification day; or

if a later commencement day is stated in the declaration—on the day stated; and

remains in force—

for a stated period of not longer than 6 months; or

if no period is stated in the declaration—for 6 months beginning on its notification day.

A declaration under subsection (1) is a disallowable instrument.