Historique
Article de Périodique
Decline in incidence of HIV and hepatitis C virus infection among injecting drug users in Amsterdam; evidence for harm reduction? (2013)
Auteur(s) :
DE VOS, A. S. ;
VAN DER HELM, J. J. ;
MATSER, A. ;
PRINS, M. ;
KRETZSCHMAR, M. E. E.
Année
2013
Page(s) :
1070-1081
Langue(s) :
Anglais
Refs biblio. :
43
Domaine :
Drogues illicites / Illicit drugs
Discipline :
MAL (Maladies infectieuses / Infectious diseases)
Note générale :
Commentary: Can ecological trends in HIV or HCV incidence be used to assess intervention impact? Vickerman P., Hickman M., p. 1082-1083.
Résumé :
Aims: In Amsterdam, HIV prevalence has nearly halved among injecting drug users (IDU) since 1990. Hepatitis C virus (HCV) prevalence also declined; HIV and HCV incidence dropped to nearly zero. We examined possible explanations for these time trends, among which the implementation of harm reduction measures aimed at reducing the risk behaviour of IDU.
Design: We used individual-based modelling of the spread of HIV and HCV. Information about demographic parameters was obtained from the Amsterdam Cohort Study (ACS) among drug users. The model included changes in inflow of new IDU and death rates over time, the latter dependent on age and time since HIV seroconversion. We considered different scenarios of risk behaviour.
Setting: IDU in Amsterdam.
Measurements: Simulated HIV and HCV incidence and prevalence were compared with ACS data.
Findings: Assuming that harm reduction measures had led to a strong decrease in risk behaviour over time improved the model fit (squared residuals decreased by 30%). However, substantial incidence and HIV prevalence decline were already reproduced by incorporating demographic changes into the model. In particular, lowered disease spread might be a result of depletion of high-risk IDU among those at risk for disease, and a decrease in the number of high-risk individuals in the population due to HIV-related mortality.
Conclusions: Marked decreases in HIV and HCV in Amsterdam since 1990 could be due partly to harm reduction measures; however, they may also be attributable largely to changes in the IDU population. Future research aimed at quantifying the benefits of interventions should not neglect the impact of natural epidemic progression and demographic changes.
KEY FINDINGS:
Marked decreases in HIV and HCV incidence in Amsterdam since 1990 could be attributable largely to changes in the population of injecting drug users arising from HIV-related deaths.
Design: We used individual-based modelling of the spread of HIV and HCV. Information about demographic parameters was obtained from the Amsterdam Cohort Study (ACS) among drug users. The model included changes in inflow of new IDU and death rates over time, the latter dependent on age and time since HIV seroconversion. We considered different scenarios of risk behaviour.
Setting: IDU in Amsterdam.
Measurements: Simulated HIV and HCV incidence and prevalence were compared with ACS data.
Findings: Assuming that harm reduction measures had led to a strong decrease in risk behaviour over time improved the model fit (squared residuals decreased by 30%). However, substantial incidence and HIV prevalence decline were already reproduced by incorporating demographic changes into the model. In particular, lowered disease spread might be a result of depletion of high-risk IDU among those at risk for disease, and a decrease in the number of high-risk individuals in the population due to HIV-related mortality.
Conclusions: Marked decreases in HIV and HCV in Amsterdam since 1990 could be due partly to harm reduction measures; however, they may also be attributable largely to changes in the IDU population. Future research aimed at quantifying the benefits of interventions should not neglect the impact of natural epidemic progression and demographic changes.
KEY FINDINGS:
Marked decreases in HIV and HCV incidence in Amsterdam since 1990 could be attributable largely to changes in the population of injecting drug users arising from HIV-related deaths.
Affiliation :
Julius Center, University Medical Center Utrecht, Utrecht, the Netherlands
Cote :
Abonnement