Acute infection- shows their symptoms immediately and dissipates quickly.
Amino acid- organic nitrogenous compounds that act as the structure of proteins and are synthesized or obtained by cells as a regular diet.
Antibody- proteins created in blood and tissue by the immune system to help neutralize and destroy possible threats.
Antigen- a toxin or enzyme which stimulates reactions from a body's immune system.
Antigenicity- The ability of an antigen to combine with antibodies and T-cell receptors to invoke a reaction from the immune system.
Autoimmune diseases– diseases caused when the immune system turns on itself because it fails to recognize its own cells.
B lymphocyte cells- bursa-dependent; manufactured in the bone; identify antigens and produce antibodies.
Bacteriophages- viruses that infect and kill harmful bacteria.
Base pair- a twin pair of nucleotides contained in a nucleic acid strand, which are linked together by hydrogen bonds.
Body fluids- fluids of the body, including circulating blood and lymph, the chyle, the gastric, pancreatic, and intestinal juices, the saliva, bile, urine, aqueous humor, and muscle serum
Budding- mature viruses leave a cell slowly, a few at a time, not killing the host cell in the process.
Bursa- a tissue space lined by joint tissue; bursas are found in between tendon and bone, skin and bone and muscles.
Carrier- one who carries a virus either in form of an infection or while it is in incubation.
Caspid- The protein outer covering of a virus made up of capsomeres; stimulates the body's immune response.
Cell- a small, enclosed unit containing the DNA, proteins, and chemicals needed for all life functions.
Chromosomes- a DNA containing body that holds most or all of the genes of an individual life form.
Chronic infection- recurring viral infections that cause damage of cells over a long period of time by disrupting their functions.
CNS- the central nervous system, which is comprised of nerves, the brain and the spinal cord.
Connective tissue- tissue that surrounds other more highly ordered tissues and organs; blood, cartilage and bone.
Cytoskeleton- protein filaments that extend through the cytoplasm of cells and enable them to move and change shape.
DNA- deoxyribonucleic acid, the basic component of all living matter, which is contained in the chromosomes of a cell's nucleus; transmits hereditary information and contains gene sequences.
Differentiated- a type of cell, which specializes in one specific task or has one specific purpose.
Dormant- being in a state of suspended animation, not actively growing but protected from the environment.