Tijuana, Mexico, just south of San Diego, California, is located by the busiest land border crossing in the world. Although UNAIDS considers Mexico to be a country of "low prevalence, high risk," recent surveillance data among sentinel populations in Tijuana suggests HIV prevalence is increasing. The aim of this study was to estimate the number of men and women aged 15 to 49 years infected with HIV in Tijuana. Gender and age-specific estimates of the Tijuana population were obtained from the 2000 Mexican census. Population and HIV prevalence estimates for at-risk groups were obtained from published reports, community based studies, and data from the Centro Nacional para la Prevención y Control del VIH/SIDA (CENSIDA). Age-specific fertility rates for Mexico were used to derive the number of low and high-risk pregnant women. Numbers of HIV-positive men and women were estimated for each at-risk group and then aggregated. A high growth scenario based on current HIV prevalence and a conservative, low growth estimate were determined. A total of 686,600 men and women in Tijuana were aged 15 to 49 years at the time of the 2000 census. Considering both scenarios, the number of infected persons ranged from 1,803 to 5,472 (HIV prevalence: 0.26 to 0.80%). The majority of these persons were men (>70%). The largest number of infected persons were MSM (N = 1,146 to 3,300) and IDUs (N = 147 to 650). Our data suggest that up to one in every 125 persons aged 15-49 years in Tijuana is HIV-infected. Interventions to reduce ongoing spread of HIV are urgently needed.

Injection drug use is a growing but understudied problem in Tijuana, a city situated on the northwestern Mexico-U.S border. The authors studied factors associated with receptive needle sharing in an effort to inform prevention activities. In 2003, street-recruited injection drug users (IDUs) in Tijuana underwent interviews on injection risk behaviors and rapid HIV antibody tests. Logistic regression was used to identify correlates of receptive needle sharing at the last injection episode. Of 402 IDUs, 87.6% were male; the median age was 34. HIV prevalence was 4.01% (95% CI: 2.29-6.51). One third reported receptive needle sharing at last injection. Factors independently associated with receptive needle sharing were years living in Tijuana (Adjusted Odds Ratio [AdjOR]= 0.97 per year, 95% CI: 0.96-0.99), being bisexual/homosexual (AdjOR=2.12; 95% CI: 1.30 - 3.44), unemployed (AdjOR=2.5; 95% CI: 1.52-4.10), never having an HIV test (AOR: 4.02; 95% CI: 2.44-6.60), having friends who placed importance on avoiding HIV (AdjOR: 0.36; 95% CI: 0.19-0.68) and last injecting in a shooting gallery (AdjOR=1.98; 95% CI: 1.21-3.24). These results underscore the need to increase access to voluntary HIV testing and counseling to IDUs and migrants in Tijuana, as well as expand access to sterile syringes in an effort to avert widespread HIV transmission.

BackgroundWorldwide, the importance of contraception to control fertility has been recognized. A useful indicator of the gap between reproductive preferences and the provision of contraception is “unmet need for contraception”. The aims of this paper are to estimate the levels of unmet need for contraception among married and single women, and to explore factors associated with unmet need for contraception for spacing and limiting births in Mexico.MethodsWe used the Mexican National Survey of Demographic Dynamics 2014, using a sub-sample of 56,797 sexually active women aged 15–49 years who were either currently in union or who had never been in union to estimate the prevalence of unmet need for spacing and limiting births. We applied multivariable binary logistic regressions to examine the relationship between unmet need for spacing and limiting considering associated factors.ResultsUnmet need for contraception was estimated at 11.5% among women in union (6.4% limiting; 5.1% spacing), and 28.9% for women never in union (8% limiting; 20.9% spacing). In the logistic regression for unmet need for spacing, the likelihood was statistically significant associated with younger women (OR = 6.8; CI = 2.95–15.48); women never in union (OR = 1.6; CI = 1.40–1.79); low levels of education (OR = 1.4; CI = 1.26–1.56); and residing in poor regions (OR = 1.9; CI = 1.52–2.49). Those with full access to public services were significantly less likely to have unmet need for spacing (OR = 0.8; CI = 0.66–0.88).In the logistic regression for unmet need for limiting, being younger (OR = 6.3; CI = 4.73–8.27), never in union and sexually active (OR = 3.0; CI = 2.47–3.54); with less schooling (OR 1.13; CI: 1.02–1.26); rural residence (OR = 1.2; CI = 1.07–1.32); and residing in poor regions (OR = 1.5; CI = 1.23–1.93) were factors positively associated with this unmet need. Women with private health services were the least likely to have unmet need for limiting (OR = 0.5; CI = 0.37–0.77).ConclusionsYounger women currently in union and never in union had the highest unmet needs of contraception for spacing and limiting. The results from this study suggest that in Mexico family planning services must prioritize the contraception needs of all young women, both in union and not in union, with appropriate and suitable services to cover their needs.

The study of transitions to adulthood in developing countries merits a review that considers new developments affecting specific spheres of life. High unemployment rates in certain job markets, new health vulnerabilities, and modified preferences regarding marriage types, all within a framework of poverty, manifest in a world in which fewer certainties result in new ways of experiencing the transition to adulthood. The objective of this article is to review recent literature on interactions among the spheres of school, work, sexuality, family formation, health, political expression, and citizenship of adolescents and young adults in developing countries. Scholars are identifying diverse life paths and observing transitions to adulthood at different ages and modalities within the same society.

This article explores trends in sexual behavior in Latin America, envisaged from a life-course perspective, taking into account social differences. It is focused on three main issues: the timing of early sexual and reproductive events, sexual activity during adulthood, and measurement of homosexuality-bisexuality. It draws on general population data from nonspecific surveys, as surveys dealing specifically with sexual behavior are scarce in Latin American countries. A traditional feature in these societies is the huge amount of social inequality, which translates directly into social differences in sexual experience, especially among women. Despite the decline in fertility, an early start of unions and of reproductive experience remains typical of groups with lower education. Another aspect is the diversity of national patterns and gender systems, very far from the image of cultural homogeneity generally associated with this region. Data show a low prevalence of homosexuality/bisexuality, which can be a result of underreporting. The paper eventually stresses the necessity of carrying out more sexual behavior surveys of the general population in the region.