By Anne Marie Helmenstine, Ph.D. Displacement Reaction Definition: A displacement reaction is a type of reaction where part of one reactant is replaced by another reactant. Single displacement reactions are reactions where one reactant replaces part of the other. AB + C â AC + B.
HIV enters the body and binds to dendritic cells (orange cells with projections) which carry the virus to CD4+ T cells in lymphoid tissue establishing the infection. Virus replication accelerates producing massive viremia and wide dissemination of virus throughout the body's lymphoid tissues.
Aging and HIV/AIDS have drastic effects on the immune system; each lower the production of T cells needed to defend the body against infection. Furthermore, evidence suggests that HIV may accelerate the aging process, and reduce an individual's T-cell count in a similar way to someone who is 20 to 30 years older.