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.
Immunoglobulin A (IgA) is a blood protein that's part of your immune system. Your body makes IgA in order to fight off infections. IgA is found in mucous membranes, especially in the respiratory and gastrointestinal tracts, and in saliva, tears, and breast milk.It appears to play a part in asthma and allergies.Researchers have also linked IgA to autoimmune conditions, in which your body's immune system mistakenly attacks your body itself.our body makes IgA in order to fight off infections. IgA is found in mucous membranes, especially in the respiratory and gastrointestinal tracts, and in saliva, tears, and breast milk. It appears to play a part in asthma and allergies.