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.
(1) The human immunodeficiency virus (HIV) particle (top) travels through the bloodstream and (2) attaches to the receptor on the surface of a lymphocyte (bottom), an immune system cell involved in fighting infections.