Harry J A van Haastrecht

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Mortality and morbidity between injecting drug users in Amsterdam (n = 624) and Baltimore (n = 2,185) are compared to generate a hypothesis about the role of different health care systems and drug user policies (universal care and harm reduction versus episodic care and criminalization, respectively). Overdose/suicide mortality was twofold higher in(More)
An investigation into the prevalence of human papilloma virus (HPV) infection, abnormal cervical cytology and the relationship between HIV- and HPV infection was done in a group of intravenously (IV) and non-IV drug-using prostitutes. From July 1991 through May 1992, hard drug-addicted prostitutes attending a sexually-transmitted-disease (STD) clinic in(More)
The impact of human immunodeficiency virus (HIV) infection and other risk factors on mortality was studied in a cohort of Dutch injection drug users and drug users who did not inject. Participants were recruited between 1985 and 1992 and followed up through 1993. Vital status was ascertained through repeat visit information, supplemented by population(More)
OBJECTIVE To determine trends in commercial sexual risk behaviour among drug-using prostitutes in Amsterdam after local and national prevention campaigns began in 1987. DESIGN A subgroup of 281 drug-using prostitutes was selected from a comprehensive, open cohort study of drug users in Amsterdam. METHODS Cross-sectional (at intake) and within-person(More)
The prevalence, risk factors, and incidence of hepatitis C virus (HCV) infection were studied in a cohort of drug users in Amsterdam. In intravenous drug users, the seroprevalence was 74% (224/304) versus 10% (4/42) in nonintravenous drug users. Risk factors independently associated with HCV antibody seropositivity were history and duration of intravenous(More)
OBJECTIVE To investigate whether notifying injecting drug users (IDU) of their positive HIV serostatus contributes to suicide and overdose mortality risk. DESIGN Members of a cohort of IDU, recruited since December 1985, who first learned their HIV serostatus after study entry but before December 1992, were studied for incidence of deaths due to suicide(More)
In order to assess the potential role of intravenous drug users (IVDUs) in Amsterdam in the heterosexual transmission of HIV, we studied the sexual behaviour of 243 male and female IVDUs with regard to their private ('steady' and 'casual') and commercial partners. The majority of the study group appear heterosexually active, especially female IVDUs, who(More)
BACKGROUND Revised guidelines for depression recommend a stepped care approach. Little is known about the implementation of the stepped care model by general practitioners (GPs) in daily practice. OBJECTIVES To evaluate the performance of Dutch GPs in their general practice regarding important elements of the stepped care model (identification, severity(More)
In December 1985 we started a study to determine the prevalence and risk factors of HIV infection among drug users and drug-using prostitutes in Amsterdam. Recruitment took place at methadone posts (not drug-free; i.e. a low-threshold programme on which some drug users continue to use hard drugs, but at a lower level) and the weekly evening sexually(More)
AIMS To determine levels of injecting drug use and sexual risk behaviours in injecting drug users during and immediately following imprisonment in The Netherlands. DESIGN, SETTING AND PARTICIPANTS Cross-sectional survey of drug injectors attending methadone clinics, a sexually transmitted disease clinic and a central research site in Amsterdam. The mean(More)