Any substance which is capable, under appropriate conditions, of inducing a specific immune response and of reacting with the products of that response, that is, with specific antibody or specifically sensitised T-lymphocytes, or both. The internal cytoplasm surrounded by a one or two-layered rigid cell wall composed of phospholipids. Infection with a virus can cause a person to develop symptoms.
Viruses can reproduce only within living cells into which they inject their genetic material.
The viral genes then subvert an infected cell's normal chemical processes to create new virus particles, usually killing the cell in the process. The disease and symptoms that are caused depend on the type of virus and the type of cells that are infected. It occurs most often after increased activity, exercise or a stressful event. Pain or numbness typically radiates to the left shoulder and down the left arm. Arteriosclerosis Condition in which the walls of arteries become hard and thick, sometimes interfering with blood circulation.