Practitioners randomised to the intervention arm will receive the standard of care surveillance letter if the notification is new. Both new and repeat notifications will receive further enhanced case support during the project if required. Support can be provided at the first phone call, or if accepted and required, in a 12-week period during which the DoH health care worker can do follow-up calls with the GP or directly with the patient to inform the patient and enhance linkage back to their GP. At the end of the 12-week period, a follow-up call we be carried out for the project evaluation.

All practitioners randomised to this arm will be contacted by telephone approximately 12 weeks after an HCV notification has been made from the laboratory to the Department of Health.This is not current standard practise and will be performed by the DoH HCV health worker for the project evaluation purpose. At this phone call consent will be sought for the GP to provide information on their clinical management of the notified patient. The details of the clinical management survey are provided as Appendix B. Details provided or missing from the standard DoH surveillance form would be confirmed with the GP at this phone call. Three attempts will be made to contact the practitioner to complete the survey within a 30-day period before they are determined to be unable to be contacted.

The health care worker will offer support to the GP for all aspects of the cascade of hepatitis C care including:

• Further testing advice
• Awareness that treatment can be prescribed by the general practitioner
• Conducting pre-treatment work-up assessment
• DAA prescription guidelines, including linkage to specialist consultation
• Providing treatment support
• Advising on testing process for cure
• Advising on post-cure management including methods of follow-up to manage risks (e.g. harm minimisation, reducing re-infection risk, opioid substitution therapy)
• Linking GP to resources for patients with cirrhosis or other concerns to specialist support for ongoing management.

The GP will be offered the option of the DoH specialist to contact the patient directly with the GP's consent to notify them of their result and to educate them on testing and treatment options and referral back to their GP.

The primary outcome will be the proportion of cases notified with hepatitis C who commence hepatitis C treatment within 12 weeks of initial contact. This will be assessed using the information provided by practitioners at the 12-week follow-up phone call and will be compared across the two arms.

The the proportion of cases notified with hepatitis C with documented HCV RNA results within 12 weeks of initial contact. This will be assessed using lab data and information provided by practitioners.