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A look at the two vaccines designed to help prevent meningococcal disease in preteens, teens, and young adults: MenACWY and MenB.

Lymphadenitis is an infection in one or more lymph nodes. The lymph nodes help filter bacteria, viruses, and other unwanted material from the body.

Alzheimer disease is a type of brain disorder. It causes memory loss, confusion, and changes in personality. It is a type of dementia. Read this to learn about the stages of Alzheimer disease.

Spinal stenosis is a condition in which the spinal canal narrows and pinches the nerves. This results in back and leg pain. Read this for more information about the condition, including symptoms, treatment, and prevention.

Most kidney donors live normal lives with one kidney. Once you recover from surgery, you will be able to return to your normal activities. Here's what you need to know about home care after surgery.

Carnitine is a nutrient that helps the body's cells work normally. Primary carnitine deficiency is when not enough carnitine can get into cells in the body. It is a rare health problem a child is born with. Learn more about it, including the causes, symptoms, diagnosis, and treatment.

Carnitine is a nutrient that helps the body's cells work normally. Secondary carnitine deficiency is when there isn't enough carnitine in the blood. Read this to learn more about this condition, including the causes, symptoms, ways to diagnose it, and the treatment options.

Neuronal and mixed neuronal-glial tumors are types of rare tumors that occur in the brain or spinal cord. There are many kinds of these tumors. But a person will have just 1 tumor of 1 type.

Campylobacter infection is a mild to serious digestive illness. It is caused by bacteria. Symptoms often include cramping, diarrhea, belly pain, and fever.