There are four methods of virus development, but, B-lymphocytes are the antibody machine.

Live, attenutated

Inactivated/Killed

Toxoid (inactiated toxin)

Subunit/conjugate

A person produces white blood cells every day. The human body is magnificent. The immune response if very complex and it isn't easy to simplify to communicate the process. The same immune response when it is a vaccine at work, is produced whenever the need exists. How does that immune response occur and what happens when it doesn't?

B-lymphocytes are the memory cells. T-lymphocytes also have the capacity for developing an antibody response, but, the B-lymphocytes primarily produce the antibodies from the attack of macrophages of the antigen.

B-cell development. The figure shows the broad outline of B-cell developmental stages in mice and humans. B-1a, B-1b, and B10 populations are less well characterized in humans. CLP indicates common lymphoid progenitor; SHM, somatic hypermutation; and CSR, class switch recombination.

White blood cells (click here) get their start in your bone marrow. They have a short life -- only two to three days -- so your body constantly makes more. There are different types, and they all have the same goal: to fight infection.

They wait, poised for duty, in many different places in your body, including your:

• Thymus
• Spleen
• Tonsils
• Blood vessels
• Lymph nodes
• Small intestine
• Adenoids
• Blood vessels