Severe Combined Immunodeficiency

Also known as SCID, this immune system disorder is defined by a severe defect in the body's production of T-cells. Your T-cells, basically, may be thought of as the Marines of your whole defense system; T-cells do not just provide a defensive wall but they are the elite fighting units that actually attack unwanted intruders in your body. Now, you can just imagine what will happen if your body has only a few of these soldiers; it will be totally impossible for your body to keep off infections.

A classic case of SCID has been experienced by a young boy in Texas who tried to live inside a sterilized plastic bubble to prevent microorganisms from getting inside his body. This boy even became a stuff of medical legend and has been known as the Bubble Boy, which later on paved the way for this disease to be referred to as the bubble boy disease.

Acquired Or Secondary Type
Most are born without any defects in their immune system. However, factors like malnutrition, severe infections or nasty side-effects from some medication may cause disorders in some people that can weaken the body's immune system. This type of immunodeficiency may include the following.