Application of a novel method to estimate incidence of hepatitis C among injecting drug users in Scotland

N. Palmateer, E. Allen, A. Taylor, S. Hutchinson, D. Goldberg

Research output: Contribution to journalConference Contribution

Abstract

Prevalence of the hepatitis C virus (HCV) among injecting drug users (IDUs) in Scotland is high. Through an HCV Action Plan, the Scottish Government has invested significantly in harm reduction interventions with the goal of reducing HCV transmission among IDUs. In evaluating the effectiveness of interventions, estimates of the incidence, rather than the prevalence, of HCV are essential. The traditional approach to measuring incidence—follow-up of a cohort of uninfected individuals to measure seroconversion—can, however, be costly and suffer high participant attrition rates. We report the first large-scale, national application of a novel method designed to determine incidence of HCV using a cross-sectional design.
During 2008–2009, IDUs were recruited from needle exchange services, completed an interviewer-administered questionnaire and provided a dried blood spot for anonymous HCV-antibody (anti-HCV) and HCV-RNA testing. Incident infections were defined as individuals who were anti-HCV negative and HCV-RNA positive.
Prevalence of anti-HCV was 55% among the 2563 participants. Among anti-HCV negative respondents, twenty-one were HCV-RNA positive, yielding an incidence estimate of 12.1 per 100 person-years (corresponding to a viraemic pre-seroconversion window period of 51 days). Individuals currently receiving methadone had lower odds of incident infection (adjusted OR 0.15; 95% CI 0.035 to 0.68) relative to those on methadone in the previous 6 months (but not currently).
This approach to measuring incidence will allow us to gauge the impact of preventive interventions associated with the HCV Action Plan.
LanguageEnglish
Article numberP1-44
PagesA79-A79
JournalJournal of Epidemiology and Community Health
Volume65
Issue numberSupplement 1
DOIs
Publication statusPublished - 2011
EventIEA World Congress of Epidemiology - Edinburgh, United Kingdom
Duration: 7 Aug 201111 Aug 2011

Fingerprint

Scotland
Hepatitis C
Drug Users
Hepacivirus
Incidence
Hepatitis C Antibodies
Methadone
RNA
Harm Reduction
Infection
Needles
Interviews

Keywords

  • IDU
  • injecting drug user
  • Scotland
  • hepatitis C

Cite this

Palmateer, N. ; Allen, E. ; Taylor, A. ; Hutchinson, S. ; Goldberg, D. / Application of a novel method to estimate incidence of hepatitis C among injecting drug users in Scotland. In: Journal of Epidemiology and Community Health. 2011 ; Vol. 65, No. Supplement 1. pp. A79-A79.
@article{d7b2a501960a4edca6433f42073d04af,
title = "Application of a novel method to estimate incidence of hepatitis C among injecting drug users in Scotland",
abstract = "Prevalence of the hepatitis C virus (HCV) among injecting drug users (IDUs) in Scotland is high. Through an HCV Action Plan, the Scottish Government has invested significantly in harm reduction interventions with the goal of reducing HCV transmission among IDUs. In evaluating the effectiveness of interventions, estimates of the incidence, rather than the prevalence, of HCV are essential. The traditional approach to measuring incidence—follow-up of a cohort of uninfected individuals to measure seroconversion—can, however, be costly and suffer high participant attrition rates. We report the first large-scale, national application of a novel method designed to determine incidence of HCV using a cross-sectional design.During 2008–2009, IDUs were recruited from needle exchange services, completed an interviewer-administered questionnaire and provided a dried blood spot for anonymous HCV-antibody (anti-HCV) and HCV-RNA testing. Incident infections were defined as individuals who were anti-HCV negative and HCV-RNA positive.Prevalence of anti-HCV was 55{\%} among the 2563 participants. Among anti-HCV negative respondents, twenty-one were HCV-RNA positive, yielding an incidence estimate of 12.1 per 100 person-years (corresponding to a viraemic pre-seroconversion window period of 51 days). Individuals currently receiving methadone had lower odds of incident infection (adjusted OR 0.15; 95{\%} CI 0.035 to 0.68) relative to those on methadone in the previous 6 months (but not currently).This approach to measuring incidence will allow us to gauge the impact of preventive interventions associated with the HCV Action Plan.",
keywords = "IDU, injecting drug user, Scotland, hepatitis C",
author = "N. Palmateer and E. Allen and A. Taylor and S. Hutchinson and D. Goldberg",
year = "2011",
doi = "10.1136/jech.2011.142976c.37",
language = "English",
volume = "65",
pages = "A79--A79",
journal = "Journal of Epidemiology and Community Health",
issn = "0143-005X",
number = "Supplement 1",

}

Application of a novel method to estimate incidence of hepatitis C among injecting drug users in Scotland. / Palmateer, N.; Allen, E.; Taylor, A.; Hutchinson, S.; Goldberg, D.

In: Journal of Epidemiology and Community Health, Vol. 65, No. Supplement 1, P1-44, 2011, p. A79-A79.

Research output: Contribution to journalConference Contribution

TY - JOUR

T1 - Application of a novel method to estimate incidence of hepatitis C among injecting drug users in Scotland

AU - Palmateer, N.

AU - Allen, E.

AU - Taylor, A.

AU - Hutchinson, S.

AU - Goldberg, D.

PY - 2011

Y1 - 2011

N2 - Prevalence of the hepatitis C virus (HCV) among injecting drug users (IDUs) in Scotland is high. Through an HCV Action Plan, the Scottish Government has invested significantly in harm reduction interventions with the goal of reducing HCV transmission among IDUs. In evaluating the effectiveness of interventions, estimates of the incidence, rather than the prevalence, of HCV are essential. The traditional approach to measuring incidence—follow-up of a cohort of uninfected individuals to measure seroconversion—can, however, be costly and suffer high participant attrition rates. We report the first large-scale, national application of a novel method designed to determine incidence of HCV using a cross-sectional design.During 2008–2009, IDUs were recruited from needle exchange services, completed an interviewer-administered questionnaire and provided a dried blood spot for anonymous HCV-antibody (anti-HCV) and HCV-RNA testing. Incident infections were defined as individuals who were anti-HCV negative and HCV-RNA positive.Prevalence of anti-HCV was 55% among the 2563 participants. Among anti-HCV negative respondents, twenty-one were HCV-RNA positive, yielding an incidence estimate of 12.1 per 100 person-years (corresponding to a viraemic pre-seroconversion window period of 51 days). Individuals currently receiving methadone had lower odds of incident infection (adjusted OR 0.15; 95% CI 0.035 to 0.68) relative to those on methadone in the previous 6 months (but not currently).This approach to measuring incidence will allow us to gauge the impact of preventive interventions associated with the HCV Action Plan.

AB - Prevalence of the hepatitis C virus (HCV) among injecting drug users (IDUs) in Scotland is high. Through an HCV Action Plan, the Scottish Government has invested significantly in harm reduction interventions with the goal of reducing HCV transmission among IDUs. In evaluating the effectiveness of interventions, estimates of the incidence, rather than the prevalence, of HCV are essential. The traditional approach to measuring incidence—follow-up of a cohort of uninfected individuals to measure seroconversion—can, however, be costly and suffer high participant attrition rates. We report the first large-scale, national application of a novel method designed to determine incidence of HCV using a cross-sectional design.During 2008–2009, IDUs were recruited from needle exchange services, completed an interviewer-administered questionnaire and provided a dried blood spot for anonymous HCV-antibody (anti-HCV) and HCV-RNA testing. Incident infections were defined as individuals who were anti-HCV negative and HCV-RNA positive.Prevalence of anti-HCV was 55% among the 2563 participants. Among anti-HCV negative respondents, twenty-one were HCV-RNA positive, yielding an incidence estimate of 12.1 per 100 person-years (corresponding to a viraemic pre-seroconversion window period of 51 days). Individuals currently receiving methadone had lower odds of incident infection (adjusted OR 0.15; 95% CI 0.035 to 0.68) relative to those on methadone in the previous 6 months (but not currently).This approach to measuring incidence will allow us to gauge the impact of preventive interventions associated with the HCV Action Plan.

KW - IDU

KW - injecting drug user

KW - Scotland

KW - hepatitis C

U2 - 10.1136/jech.2011.142976c.37

DO - 10.1136/jech.2011.142976c.37

M3 - Conference Contribution

VL - 65

SP - A79-A79

JO - Journal of Epidemiology and Community Health

T2 - Journal of Epidemiology and Community Health

JF - Journal of Epidemiology and Community Health

SN - 0143-005X

IS - Supplement 1

M1 - P1-44

ER -