The HIV transmission gradient: relationship patterns of protection.

We describe a gradient of potential HIV transmission from HIV-infected persons to their partners and thence to uninfected populations. The effect of this newly discovered transmission gradient is to limit the spread of HIV. We roughly estimate a 2% long-term transmission probability for sex and 14% for drug injection for two-step transmission.

Social support, drug use, and employment among low-income women.

This study examined social support and its association with employment, income, and drug use in a sample of 534 low-income women. Functional support was defined as the perceived quality of one's interactions with others. Structural support was defined as the number of individuals within five particular types of networks: social, employment, drug, close, and emergency.