AIDS is the disease caused by the damage that HIV does to your immune system. You have AIDS when you get rare, dangerous infections or have a super low number of CD4 cells. AIDS is the most serious stage of HIV, and it leads to death over time.
1 One in every 330 Americans will develop cancer by the age of 20. 2  On the average, 12,500 children and adolescents in the U.S. are diagnosed with cancer each year. 3  On the average, 1 in every 4 elementary school has a child with cancer. 4  The average high school has two students who are a current or former cancer patient.
Leukemia is the most common form of childhood cancer. In the United States, leukemia affects around 3,500 children aged 0-14 each year which represents around 40% of all childhood cancers. In young adults, leukemia rates are somewhat lower but the disease is still one of the 5 most common forms of cancer in the 15-39 age group. Childhood leukemia rates in the USA have been increasing steadily by around 1% a year for the past half century.