USAID states that “In Zambia, high prevalence rates are fueled by early initiation of sex, unprotected sex with non-regular partners, concurrent sexual partnerships, low incidence of condom use among high risk groups and individuals, sexual violence against women, and poverty that forces women and girls to sell sex for food, good grades, small gifts, or money. The most at risk individual in Zambia, however, is the seronegative partner in a discordant couple. Annually there is an 11.8% seroconversion of negative partners. It is estimated that 21% of couples are discordant in Lusaka. Other groups at comparatively high risk include highly mobile populations such as migrant workers, sex workers, long distance truck drivers, minibus drivers, refugees, prisoners, uniformed personnel (such as the military and police), and fishmongers.”