Meningitis is most often caused by a bacterial or viral infection that moves into the cerebral spinal fluid (CSF).

Detailed information on vision and hearing in newborns

A detailed look at Turner syndrome, a genetic disorder that occurs in girls.

Human parainfluenza viruses (HPIVs) are a group of viruses that cause different types of respiratory infections. They are more common in children and babies. But they can occur in people of any age, especially those with a weak immune system.

Detailed information on HIV home care for your child

Haemophilus influenzae (H. influenzae) is a group of bacteria that can cause different types of infections in babies and children. H. influenzae most often cause ear, eye, or sinus infections. They also cause pneumonia.

Cold sores are small blisters around the mouth caused by the herpes simplex virus. Once a child is infected with the virus, the virus becomes inactive (dormant) for long periods of time. It can then become active at any time and cause cold sores.

An electroencephalogram (EEG) is a test that measures the electrical activity in the brain (brain waves). Small, round discs with wires (electrodes) are placed on the scalp during the test. The electrodes are not painful to your child.

Evaluating and diagnosing damage to the nervous system can be complicated. Many of the same symptoms occur in different combinations among the different disorders, and many disorders do not have definitive causes, markers, or tests.

Detailed information on the most common diagnostic tests for neurological disorders in children