Sexual behavior and drug abuse in homosexuals,prostitutes and prisoners in Tijuana,Mexico

Results are presented of a sociodemographic and epidemiologic survey conducted between July-October 1988 in Tijuana, Mexico, among 3 subgroups believed to be at high risk of HIV infection. 383 female and 32 male prostitutes recruited at the Municipal Medical Services clinic in Tijuana, 376 male and 34 female prisoners recruited ate the State Penitentiary, 233 male homosexuals and bisexuals recruited in bars and other meeting places, and 11 drug addicts treated at a detoxification program were successfully interviewed. Although only 11 iv drug addicts were located and agreed to participate, 5 prostitutes, 85 prisoners, and 5 homosexual/bisexual reported histories of iv drug use. The homosexual/bisexual group was relatively younger and better educated,and had higher incomes than the other groups. The average age was 25.6 for homosexual/bisexuals, 29.5 for prostitutes, and 29 for prisoners. 82.7% of homosexual/bisexuals, 46.3% of prostitutes, and 44.4% of prisoners were single. Among prostitutes and prisoners, respectively, 6.5 and 25.9% were married and 22.2 and 18/5% were in consensual unions. The average number of years of schooling were 10.3 for homosexual/bisexuals, 5.6 for prostitutes, and 6.3 for prisoners. Male prostitutes reported the highest average number of sexual partners in the past year (261 +or- 341), prisoners reported the greatest frequency of iv drug users as sexual partners, and homosexual/bisexuals reported the highest frequency of receptive anal intercourse. 35% of respondents reported a history of sexually transmitted diseases. 36% of female prostitutes and 4% of prisoners reported using condoms regularly during vaginal intercourse. 25% of homosexual/bisexuals reported using condom regularly during anal intercourse. 31% of respondents reported having been tested previously for HIV antibodies,but only 41% of those knew the results. 72 homosexual/bisexuals, 56 prostitutes, and 126 prisoners reported having had sexual relations in the US. 80% of respondents reported consuming alcohol, 64% cigarettes, and 28% illegal drugs. The most frequently used illegal drug was marijuana. 68% of the 106 identified iv drug users continued to use drugs. The rest reported having used them since 1978. The introduction of HIV into these subpopulations has been slow but steady. Infection rates in this sample were .5% for prostitutes, 1.2% for prisoners, 11.6% for homosexual/bisexuals, and 1.9% for the 106 iv drug users.