Biological Correlates of Sexual Transmission of HIV Practical Consequences and Potential Targets for Public Health : Practical Consequences and Potential Targets for Public Health.

The probability of sexual transmission of HIV depends on the infectiousness of the index case and the susceptibility of the sexual contact. The risk of HIV transmission is heterogeneous and may be greatest during the initial sexual contacts in a steady partnership. Several factors, including systemic and mucosal acquired protective immune-response might be responsible for the apparent decrease of per-sex-act risk of transmission in a given partnership over time. Biological studies can be used to better understand the complex information obtained by epidemiological surveys. The infectiousness of HIV depends on the inoculum, and virologic factors. The genital tract viral load of the index case is likely the most important determinant of transmission. At the population level, interventions that reduce the genital shedding of HIV by reducing systemic blood viral load and/or local inflammatory processes are likely to have a beneficial impact on HIV incidence. Antiretroviral drugs are likely to reduce sexual transmission of HIV. However, these drugs may not all prove equally. Compartmentalized HIV replication in the male and female genital tract have been observed. Treatment with antiretroviral drugs that poorly penetrate the genital tract harbour the risk of local production and spread of resistant viruses. In addition, increased risk taking behaviour could offset the benefits of reduced probability of transmission at the population level. Biological data about HIV transmission must be used to inform public health policies and optimize HIV prevention strategies.