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COVID-19 What is COVID-19? COVID-19 is an infectious disease that most often causes a respiratory illness. You may hear it called COVID or coronavirus disease 2019. It's caused by a virus called SARS-CoV-2. There are many types of coronaviruses. They are a common cause of

Rett Syndrome in Children What is Rett syndrome in children? Rett syndrome is a rare genetic developmental and neurological disorder. It almost exclusively affects girls. Children with this disorder often develop normally for their first 6 to 18 months. After that, they start to

Polio (Poliomyelitis) What is polio? Poliomyelitis is commonly called polio. It's an infectious disease. It is caused by 1 of 3 types of poliovirus. Polio is easily spread from person to person. The poliovirus is a virus that can cause paralysis. But most people who are infected

Diphtheria What is diphtheria? Diphtheria is an illness caused by bacteria. There are two types: Respiratory diphtheria. This type affects the throat, nose, and tonsils. Skin (cutaneous) diphtheria. This type affects the skin. It was a common childhood disease in the past. A

Meconium Aspiration What is meconium aspiration? Meconium aspiration is when a newborn breathes in a mixture of meconium and amniotic fluid. Amniotic fluid is the liquid that surrounds the baby in the womb. Meconium is the baby's first stool, or poop. It is sticky, thick, and

Common Cold in Children What is the common cold in children? The common cold (upper respiratory infection) is one of the most common illnesses in children. Each year it leads to more doctor visits and missed days from school and work than any other illness. Millions of people in

Long QT Syndrome What is long QT syndrome? Long QT syndrome (LQTS) is a disease that can cause a dangerous rapid heart rate and irregular rhythm involving the bottom pumping chambers of the heart (ventricles). The heart has both muscular and electrical components. Electricity

Gestational Diabetes What is gestational diabetes? Gestational diabetes is a type of diabetes that happens during pregnancy. Unlike type 1 diabetes, gestational diabetes is not caused by having too little insulin. Instead, hormones made by your placenta keep your body from using

Respiratory Syncytial Virus (RSV) in Children What is respiratory syncytial virus (RSV) in children? RSV is a viral illness that causes symptoms such as trouble breathing. It's the most common cause of inflammation of the small airways in the lungs (bronchiolitis) and pneumonia

Multiple Sclerosis and Pregnancy What is multiple sclerosis? Multiple sclerosis (MS) is a chronic disease of the central nervous system, which is made up of the brain and spinal cord. MS is unpredictable. The symptoms of MS can range from mild to disabling, such as losing the