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.
HIV affects the immune system. Testing a small sample of blood can show the health of the immune system and how much HIV is in the blood. Other tests can look at the health of other parts of the body, which may be affected by HIV or other conditions.