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Spinal muscular atrophy (SMA) is a disease of the nerves and muscles caused by certain genes. It causes muscle wasting and weakness.

Wilms tumor is a cancerous tumor that starts in the cells of the kidney. It’s the most common type of kidney cancer in children.

Stitches and adhesive strips are used to treat lacerations. Learn how to give your child first aid for cuts and when stitches or adhesive strips are needed.

Both venomous and nonvenomous snakes can bite. It's important to treat all snakebites as if they are venomous. Here's what you need to know.

Most spiders in the U.S. are poisonous. The fangs of most spiders are too short or too fragile to break through human skin. Or their poison (venom) is too weak to cause damage. Most spider bites cause only minor, local reactions. But bites from the black widow and the brown recluse spiders can cause serious problems. Read on to learn more.

Sinusitis is an inflammation of the sinuses that usually happens after a cold or with allergies. Here's what you need to know.

Pharyngitis is redness, pain, and swelling of the throat, and tonsillitis is inflammation of the tonsils. Learn more about these conditions in children, including causes, symptoms, and treatment.

This test looks for certain bacteria in a wound or an infection in a fluid sample. These bacteria are called anaerobic because they don’t need oxygen to grow.

This test looks for the bacteria that cause strep throat. Strep throat causes a severe sore throat and makes it painful to swallow.