Helper T-cells are a type of lymphocyte formed in the thymus and play a key part in the body's immune system. Helper T-cells identify the presence of invading organisms and help the B-lymphocytes to produce an antibody that enhances immunity. The normal ratio of helper T-cells to suppressor T-cells is approximately 2:1. This becomes inverted in people with AIDS but may also be temporarily abnormal in people for other reasons.