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.
What does HIV do? HIV binds to the host cell membrane, and the core of the virus passes inside. In the host cell, the RNA and virus enzymes are released. One enzyme from the virus, called reverse transcriptase, copies the genetic code of the RNA strand into a DNA helix. This DNA then enters the host nucleus and is 'spliced' into the host's DNA of a chromosome.