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.
HIV actually attaches to the CD4+ protein on the surface of these and other cells to gain entry. CD4+ can be likened to a doorway that HIV uses to enter the inner compartments of the cell. However, experiments in test tubes suggest that the CD4+ protein alone is not enough to allow viral entry into cells.