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.
Enmeshed in the viral envelope is a complex HIV protein called env. Two glycoproteins make up env and these protrude from the virion. The cap of the protein is called gp120 and the stem is gp41. For HIV to enter a host cell, it must first use gp120 to attach to a CD4 receptor.The CD4 receptor is found on CD4 T-cells and macrophages. The host cell has neutralising antibodies that can block gp120âs attachment, but because HIV is a new virus, there is some lag time in producing enough antibodies to prevent this.or HIV to enter a host cell, it must first use gp120 to attach to a CD4 receptor. The CD4 receptor is found on CD4 T-cells and macrophages. The host cell has neutralising antibodies that can block gp120âs attachment, but because HIV is a new virus, there is some lag time in producing enough antibodies to prevent this.