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The variables in Eq. (30)
| Variables | Description |
|---|---|
| S | Susceptible individuals who inject drugs and share needles within the community of people who inject drugs (PWID) |
| Early-stage infected individuals (acute HCV infection) | |
| Late-stage-infected individuals (chronic HCV infection) | |
| Uninfected needles | |
| Infected needles |
All of the variables are measured as the number of people
