What CD4 count is indicative of AIDS?

A CD4 count of less than 200 cells/mm³ is a critical benchmark for the diagnosis of AIDS (Acquired Immunodeficiency Syndrome). This threshold is established by the Centers for Disease Control and Prevention (CDC) and indicates a severe level of immunocompromise. In the context of HIV infection, a CD4 count below this level means that the immune system is severely weakened, leading to increased susceptibility to opportunistic infections and certain cancers that are hallmark indicators of AIDS.

CD4 cells are a type of T-cell crucial for maintaining the immune response. As the HIV virus attacks and reduces these cells, the body's ability to fight off infections and diseases diminishes. Therefore, monitoring CD4 counts is vital for assessing the progression of HIV and the necessary interventions for treatment. When the CD4 count falls below 200, it signifies that the individual has progressed from HIV infection to AIDS, warranting more aggressive therapeutic strategies and preventive care to address the heightened risk of complications.