"Senora Desiree cries when she talks about her only son, who is HIV-positive. The fact that the 18-year-old has been barred from visiting Chicago only heaps humiliation on top of her pain. ""I have suffered so much because of the law," said Desiree, a Chicago resident who last saw her son in their native Nicaragua three years ago. "President Barack Obama recently announced that the 22-year-old ban on entry into the United States for anyone infected with HIV/AIDS will be lifted in January, making life a bit easier for mothers such as Desiree, who did not want her full name used because of the stigma of having an HIV-positive relative. Tuesday marks the 21st World AIDS Day, and Americans today are more enlightened about how the disease is transmitted than they were two decades ago."