Examination of the risk of reinfection with hepatitis C among injecting drug users who have been tested in Glasgow

Scott Mcdonald, Sharon Hutchinson, S.O. Cameron, Hamish Innes, Allan McLeod, David J. Goldberg

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Unsafe injecting practices put injecting drug users (IDUs) at repeat exposure to infection with the hepatitis C virus (HCV). It has not yet been determined if spontaneously clearing one's primary infection influences the risk of reinfection; our aim was to estimate the relative risk of reinfection in IDUs who have cleared the virus.
We conducted a retrospective study using a large database of HCV test results covering Greater Glasgow Health Board during 1993–2007 to calculate rates of infection and reinfection in current/former IDUs. The relative risk of (re)infection in previously infected compared with never-infected IDUs was estimated using Poisson regression, adjusting for age at study entry, sex, and calendar period of test.
Although the rate of reinfection in IDUs who were HCV antibody-positive, RNA-negative at baseline was lower (7/100 person-years, 95% CI: 5–9) than the rate of acute infection in IDUs who were HCV antibody-negative at baseline (10/100 person-years, 95% CI: 9–12), the risk of reinfection was not significantly different than the risk of initial infection (adjusted rate ratio = 0.78, 95% CI: 0.57–1.08).
We found only weak evidence for a reduced risk of HCV reinfection in IDUs who had cleared their previous infection. Further research among those who have cleared infection through antiviral therapy is needed to help inform decisions regarding treatment of IDUs.

Original languageEnglish
Pages (from-to)353-357
Number of pages5
JournalInternational Journal of Drug Policy
Issue number5
Early online date13 Mar 2012
Publication statusPublished - Sept 2012


  • mathematical analysis
  • hepatitis C
  • infection
  • risk of reinfection
  • injecting drug users
  • glasgow
  • examination
  • risk
  • hepatitis C virus
  • intravenous substance abuse
  • incidence
  • epidemiology


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