(1) Subject to this section, a person who is insured under this Part against personal injury caused by accident arising out of and in the course of his or her employment shall be insured also against any prescribed disease and against any prescribed personal injury not so caused, being a disease or injury due to the nature of that employment and developed on or after 1 May 1967.

(2) A disease or injury shall be prescribed for the purposes of this section in relation to any insured persons, where the Minister is satisfied that -

(a) it ought to be treated, having regard to its causes and any other relevant considerations, as a risk of their occupations and not as a risk common to all persons, and

(b) it is such that, in the absence of special circumstances, the attribution of particular cases to the nature of the employment can be established or presumed with reasonable certainty.

(3) Regulations prescribing any disease or injury for the purposes of this section may provide that a person who developed the disease or injury on or at any time after a date specified in the regulations, being a date before the regulations came into force but not before 1 May 1967, shall be treated for the purposes of this section, subject to any prescribed modifications, as if the regulations had been in force when the person developed the disease or injury.