CD4 White Blood Cells
CD4 cells are the primary target of HIV. A CD4 test quantifies helper T-cells and is often combined with viral load testing to monitor the progression of HIV. CD4 testing shows the strength of the immune system, but does not report viral activity. As established by the Centers for Disease Control and Prevention (CDC), a person with HIV and a CD4 count below 200 or a CD4 percentage below 14% is considered to have AIDS. An increased CD4 count can result from an immune response to an infection or a recent vaccination. A decreased CD4 count, in combination with higher numbers on a viral load test, indicates an increased risk of getting sick from opportunistic diseases.
Read more about this topic: Viral Load
Famous quotes containing the words white, blood and/or cells:
“As white their bark, so white this lady’s hours.”
—Ezra Pound (1885–1972)
“Communism, my friend, is more than Marxism, just as Catholicism ... is more than the Roman Curia. There is a mystique as well as a politique.... Catholics and Communists have committed great crimes, but at least they have not stood aside, like an established society, and been indifferent. I would rather have blood on my hands than water like Pilate.”
—Graham Greene (1904–1991)
“Madness is locked beneath. It goes into tissues, is swallowed by the cells. The cells go mad. Cancer is their flag. Cancer is the growth of madness denied.”
—Norman Mailer (b. 1923)