Mn. Burattini et al., Correlation between HIV and HCV in Brazilian prisoners: evidence for parenteral transmission inside prison, REV SAUDE P, 34(5), 2000, pp. 431-436
Objective It is an accepted fact that confinement conditions increase the r
isk of some infections related to sexual and/or injecting drugs practices.
Mathematical techniques were applied to estimate time-dependent incidence d
ensities of HIV infection among inmates.
Methods A total of 631 prisoners from a Brazilian prison with 4,900 inmates
at that time were interviewed and their blood drawn. Risky behavior for HI
V infection was analyzed, and serological tests for HIV, hepatitis C and sy
philis were performed, intended as surrogates for parenteral and sexual HIV
transmission, respectively. Mathematical techniques were used to estimate
the incidence density ratio, as related to the time of imprisonment.
Results Prevalence were: HIV - 16%; HCV - 34%; and syphilis - 18%. The main
risk behaviors related to HIV infection were HCV prevalence (OR=10.49) and
the acknowledged use of injecting drugs (OR=3.36). Incidence density ratio
derivation showed that the risk of acquiring HIV infection increases with
the time of imprisonment, peaking around three years after incarceration.
Conclusions The correlation between HIV and HCV seroprevalence and the resu
lts of the mathematical analysis suggest that HIV transmission in this popu
lation is predominantly due to parenteral exposure by injecting drug, and t
hat it increases with time of imprisonment.