Background: To explore any association between the timing of the initiation of sexual activity and sexual behaviors and risks among university students in China.

Background: The vulnerability of young people to HIV and the recent emergence of the HIV epidemic in China have made it urgent to assess and update the HIV/STD risk profile of Chinese young people.

The prevalence of HIV-1 infection has reached an alarming level among IDUs in Tehran, with incarceration-related exposures revealed to be the main correlates of HIV-1 infection. Urgent and comprehensive harm reduction programs for drug users in prison and those in the community in Tehran are of prime importance to prevent further transmission of HIV infection.

No abstract

HIV-1 infection is already prevalent among drug users in Tehran, Iran and shared injection inside prison has been revealed to be a particular risk factor for HIV-1 infection among injecting drug users. Harm reduction programs which have been started in Iran should be urgently expanded particularly in correctional settings and strengthened by condom use promotion to prevent sexual acquisition or transmission of HIV-1 among drug users.