Intake of a cohort study of urban factory workers in northwest Tanzania. Risk factors for HIV-1 infection

Trop Geogr Med. 1994;46(3):157-62.


A cohort study has been started of urban factory workers and their spouses in Tanzania, in order to 1) identify risk factors for HIV-1 seroconversion, and 2) document changes over time in risk behaviour, in particular condom use and partner change, and determine whether these are associated with a reduced incidence of HIV-1 and other sexually transmitted diseases. We report findings at intake from October 1991 to March 1992. Study participants were interviewed, examined, and screened for HIV-1 and syphilis. HIV-1 prevalence was 91/926 (10%) in males and 36/217 (17%) in females. Statistically significant risk factors for HIV-1 infection in males were age group, region of birth, not being married for more than 5 years, being uncircumcised, having had a genital ulcer in the past four months, and having received injections from medical staff in the past four months. HIV-1 incidence in this group is expected to be between 1% and 2% per year. It is concluded that a longitudinal study is needed to assess the importance of partner change. This cohort appears to be suitable for such a study as HIV-1 incidence is expected to be fairly high, HIV-1 prevalence and risk factors are comparable to those of the general population and cooperation of the factory workers is good.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adolescent
  • Adult
  • Cohort Studies
  • Female
  • HIV Infections / epidemiology*
  • Humans
  • Male
  • Middle Aged
  • Prevalence
  • Risk Factors
  • Sexually Transmitted Diseases / epidemiology
  • Syphilis / epidemiology
  • Tanzania / epidemiology
  • Urban Population*
  • Workplace