From a Health and Human Services site (remember that department?):
AIDS has killed more than 20 million people since the first cases were diagnosed in 1981, including 2.9 million in 2003 alone. It is estimated that 37.8 million people were infected with HIV at the end of 2003, with 4.8 million new cases that year. Sub-Saharan Africa is the worst-hit region, with 70 percent of all people living with HIV.
37.8 million people? That's more than the populations of all but the thirty-one largest nations. Larger than the population of Sudan. More than Iraq. More than Saudi Arabia. More than Canada. More than Australia. . . .