What is CD4 immunity?

CD4 immunity refers to the immune response mediated by CD4+ T cells, a type of white blood cell that plays a crucial role in orchestrating the immune system's response to infections. These cells help activate other immune cells, such as B cells and CD8+ T cells, enhancing the body's ability to fight off pathogens, particularly viruses and certain bacteria. CD4+ T cells are essential for maintaining immune system balance and memory, making them a key focus in research related to vaccines and immunotherapies. Their depletion, as seen in HIV infection, leads to increased susceptibility to infections and certain cancers.