At the university hospital, they were older (median age 44.3 years vs 38.5 years, p < 0.001), had a higher proportion of males (56% vs 40%, p = 0.001), a higher proportion of the presence AIDS-defining illness (52.5% vs 25%, p < 0.001), a higher median nadir CD4 count (150 cells/mm3 vs. 93 cells/mm3, p = 0.005), a lower proportion of having more than two sexual encounters in the prior 30 days (62% vs 72%, p = 0.033), and a higher proportion of not using condoms and/or not abstaining from sex(41% vs 14%, p < 0.001) compared to those at the general hospital. The gene discussed is CD4; the disease is AIDS.