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Related Experiment Videos

Interpreting HIV seroprevalence data from a street-based outreach program

M Y Iguchi1, D A Bux, V Lidz

  • 1Hahnemann University School of Medicine, Department of Mental Health Sciences, Philadelphia, PA 19102-1102.

Journal of Acquired Immune Deficiency Syndromes
|May 1, 1994
PubMed
Summary

Street outreach identified trends in HIV risk behavior and infection among 4,375 individuals. Despite initial high HIV rates, both infection and risk behaviors significantly declined over time, suggesting sampling bias.

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Area of Science:

  • Public Health
  • Epidemiology
  • Behavioral Science

Background:

  • Understanding trends in HIV infection and risk behaviors is crucial for public health interventions.
  • Street outreach methods are commonly used to recruit hard-to-reach populations for health studies.

Purpose of the Study:

  • To retrospectively examine changes in HIV infection and risk behaviors over time within a cohort recruited via street outreach.
  • To identify trends in HIV prevalence and associated risk factors among injection drug users (IDUs).

Main Methods:

  • Recruitment of 4,375 subjects through continuous street outreach over 31 months.
  • Collection of data on HIV-related risk behavior and HIV-antibody testing.
  • Retrospective analysis of changes across successive cohorts.

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Main Results:

  • Overall HIV antibody positivity was 42%, with a significant downward trend from 60% to 22% over time.
  • Multivariate index scores for HIV risk also showed a significant decline.
  • Mean age, proportion of Black subjects, drug injection career length, injection frequency, and use of shooting galleries all decreased significantly.

Conclusions:

  • Observed declines in HIV infection and risk behaviors are likely attributable to systematic sampling bias in street outreach.
  • Initial cohorts may have overrepresented IDUs with higher behavioral and demographic risk for HIV.