Surveillance and Treatment of Prisoners With Hepatitis C

Surveillance of HCV Incidence and Prevalence Inclusion criteria 1. 18 years of age or older 2. Voluntarily signed the (surveillance phase) informed consent form. 3. Adequate English and mental health status to provide written informed consent and comply with study procedures Exclusion criteria 1\) Prisoners of a security classification which makes clinic attendance for study visits logistically difficult 5.2 Treatment Intervention Inclusion criteria 1. 18 years of age or older. 2. Voluntarily signed the (treatment phase) informed consent form. 3. Detectable HCV RNA in plasma. 4. HCV genotypes 1-6 5. Anticipated incarceration duration \>12 weeks following the planned commencement of therapy. 6. Compensated liver disease where the following criteria must be met: 1. INR\< 1.8 2. Albumin \>30 g/L 3. Bilirubin \<35umol/L 7. Prisoners with Fibroscan \> 12KPa or AFP \>50 ng/mL must have an abdominal ultrasound or CT scan without evidence of hepatocellular carcinoma within 2 months prior to screening. 8. Negative pregnancy test at baseline (females of childbearing potential only). 9. \[For prisoners released during treatment or follow-up\] If engaging in sexual intercourse which may potentially result in pregnancy, all fertile males must be using effective contraception during treatment and during the 90 days after treatment end, and all fertile females must be using effective contraception during treatment and during the 30 days after treatment end 10. If co-infection with HIV is documented, the subject must meet the following criteria: 1. Antiretroviral (ARV) untreated for \>8 weeks preceding screening visit with CD4 T cell count \>500 cells/mm3 OR 2. On a stable ARV regimen for \>8 weeks prior to screening visit, with CD4 T cell count \>200 cells/mm3 and an undetectable plasma HIV RNA level. * Suitable ARV include: * Nucleos(t)ide reverse transcriptase inhibitors: Tenofovir disoproxil fumarate (TDF), tenofovir alafenamide (TAF), emtricitabine (FTC)Non-nucleoside reverse transcriptase inhibitors: Rilpivirine * Protease inhibitors: Atazanavir, darunavir, lopinavir, ritonavir * Integrase inhibitors: Dolutegravir, raltegravir, elvitegravir/cobicistat * Contraindicated ARV include: * Efavirenz (50% reduction in velpatasvir exposure) * Didanosine * Zidovudine * Tipranavir Other ARV agents may be permissible at the time of study commencement pending further drug-drug interaction studies; please discuss with the Medical Monitor. Exclusion criteria 1. Therapy with any systemic anti-viral, anti-neoplastic or immunomodulatory treatment (including supraphysiologic doses of steroids and radiation) \<6 months prior to the first dose of study drug. 2. Any investigational drug \<6 weeks prior to the first dose of study drug. 3. History or other evidence of clinical hepatic decompensation (i.e. ascites, encephalopathy or oesophageal variceal haemorrhage) 4. Solid organ transplant 5. Clinically significant illness (other than HCV) or any other major medical disorder that may interfere with the prisoner treatment, assessment or compliance with the protocol; prisoners currently under evaluation for a potentially clinically significant illness (other than HCV) are also excluded. 6. History of any of the following: 1. Malignancy within 5 years prior to screening, with exception of specific cancers that may have been cured by surgical resection (basal cell skin cancer, etc.). Subjects under evaluation for possible malignancy are also excluded. 2. Significant drug allergy (such as anaphylaxis or hepatotoxicity). 7. Any of the following lab parameters at screening: 1. ALT \> 10 x ULN 2. AST \> 10 x ULN 3. Direct bilirubin \> 1.5 x ULN 4. Platelets \< 50,000/uL 5. Creatinine clearance \< 60 mL/min 6. Haemoglobin \< 11 g/dL for females ; \< 12 g/dL for males 7. Albumin \< 30g/L 8. INR \> 1.5 ULN unless subject has known haemophilia or is stable on an anticoagulant regimen affecting INR 8. Chronic use of systemically administered immunosuppressive agents (e.g. prednisone equivalent \> 10 mg/day) 9. Known hypersensitivity to VEL, SOF or formulation excipients. 10. Use of prohibited concomitant medications as described in section 6.2 11. Pregnant or nursing female 12. Ongoing severe psychiatric disease as judged by the treating physician. 13. Frequent injecting drug use that is judged by the treating physician to compromise treatment safety. 14. Inability or unwillingness to provide informed consent or abide by the requirements of the study. 15. Any other criteria that is judged by the treating physician to potentially compromise treatment safety.