In a proceeding under this Act a document purporting to be an infection control guideline is admissible as evidence of the guideline if—
(a) the proceeding relates to a contravention of an obligation imposed on a person under section 19 ; and
(b) it is claimed that the person contravened the obligation by failing to minimise an infection risk; and
(c) the infection control guideline is about minimising the infection risk.