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:
“I said there was a society of men among us, bred up from their youth in the art of proving by words multiplied for the purpose, that white is black, and black is white, according as they are paid. To this society all the rest of the people are as slaves.”
—Jonathan Swift (1667–1745)
“One memorable addition to the old mythology is due to this era,—the Christian fable. With what pains, and tears, and blood these centuries have woven this and added it to the mythology of mankind! The new Prometheus. With what miraculous consent, and patience, and persistency has this mythus been stamped on the memory of the race! It would seem as if it were in the progress of our mythology to dethrone Jehovah, and crown Christ in his stead.”
—Henry David Thoreau (1817–1862)
“They are sworn enemies of lyric poetry.
In prison they accompany the jailer,
Enter cells to hear confessions.
Their short-end comes down
When you least expect it.”
—Charles Simic (b. 1938)