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- In 2016, 3.5 million people were chronically infected with HCV

- (38.1% to 68%) of current PWID are infected with HCV in 2016

- In 2007 there were 2,248,500 PWID (current)
- Allow PWID (current) population to grow with two model fitting parameters

- Flat prior to 2009
- 3 to 4 fold increase in incidence between 2010 and 2018
- Assume increasing incidence and flattening in 2030 and steady incidence until 2040

- Calibration multiplier for force of infection
- Relapse (former to current) rate and Injecting career length (current to former)

- Adjust the split such that current PWID account for (74% to 82%) of incident cases

- Former PWID population with HCV = 50%* 3.5million - fitted pop in 2016 (point 3) * fitted prevalence in point 2

- Chronic HCV is assumed to be endemic in the general population and in steady state, i.e. constant

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