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HIV AIDS What is HIV/AIDS? The term AIDS refers to the most advanced stages of an infection caused by the human immunodeficiency virus (HIV). The current definition of AIDS includes: All HIV-infected people who have fewer than 200 CD4+ T cells (also called T4 cells). These cells

Juvenile Dermatomyositis What is juvenile dermatomyositis? Juvenile dermatomyositis (JDM) is a rare disease that causes muscle inflammation and a skin rash. It's different from other muscle diseases because it also causes skin problems. Symptoms often first appear in children

Trisomy 13 and Trisomy 18 in Children What are trisomy 13 and trisomy 18 in children? Trisomy 13 and trisomy 18 are genetic disorders. They include a combination of birth defects. This includes severe learning problems and health problems that affect nearly every organ in the

X-Linked Agammaglobulinemia in Children What is X-linked agammaglobulinemia in children? X-linked agammaglobulinemia is a rare genetic disease. It causes a weakened immune system. It is also known as Bruton's agammaglobulinemia. X-linked means that the gene that causes this

Peyronie Disease What is Peyronie disease? Peyronie disease causes hard, flat plaque to form under the skin on the tissue of the penis. The plaque often starts as an inflammation that may turn into scar tissue. The plaque builds up inside the penis in the thick elastic membrane

Achondroplasia in Children What is achondroplasia in a child? Achondroplasia is the most common type of rare genetic bone disorder. The strong, flexible tissue called cartilage is not made into bone as normal. This causes a series of signs, such as short arms and legs and a large