1 Most of these diseases are infections, caused by a variety of bacteria, viruses, and parasites that can be foodborne. 2  Other diseases are poisonings, caused by harmful toxins or chemicals that have contaminated the food, for example, poisonous mushrooms.
(cluster designation 4) symbol for a glycoprotein expressed on the surface of helper T lymphocytes and other immune cells. CD4 serves as a receptor for human immunodeficiency virus envelope glycoprotein gp120.
CD4 cells play a major role in helping your immune system work properly. HIV causes disease by killing off CD4 cells. It does this by infecting the cells and turning them into virus factories, a process that kills the cell. A test called the CD4 count can tell you how many CD4 cells you have.