tonsillitis: Inflammation of the tonsils.
transposition of the great arteries: A congenital heart defect in which the aorta is connected to the right ventricle and the pulmonary artery is connected to the left ventricle (a reversal of the normal arrangement). As a result, oxygen-depleted blood is pumped back to the body while oxygen rich blood is returned to the lungs.
tetralogy of Fallot: A congenital heart defect comprised of four heart conditions (ventricular septal defect, pulmonary stenosis, right ventricular hypertrophy and an overriding aorta).
thrush: A fungal disease caused by the fungus candida albicans. Thrush causes white patches in the mouth of infants.
tonsillectomy: A surgical operation to remove the tonsils.
Turner's syndrome: A female genetic disorder that results in infertility, delayed menstruation, arrested growth, skin flaps around the neck and webs between the fingers and toes.
type 1 diabetes: The most common type of diabetes in children, type 1 diabetes occurs when the body cannot produce enough insulin to control blood sugar levels. Children with type 1 diabetes must regularly receive insulin injections.
vaccine: An administration of weakened or dead viral matter that, when injected in patients, produces an immunity to a disease.
Varicella: Also known as chicken pox, varicella is a contagious disease characterized by low fever and itchy red skin spots.
varicella zoster: The virus responsible for chicken pox.
ventricular septal defect: The most common congenital heart defect, ventricular septal defect describes a hole between the heart's ventricles, impairing the flow of oxygen-depleted blood to the lungs.
viral gastroenteritis: A viral stomach flu.
whooping cough: A bacterial disease that causes severe coughing fits, often accompanied with a "whooping" intake of breath after coughing.
Wilms’ tumor: A childhood cancer causing the growth of a malignant kidney tumor. The tumor is composed of embryonic cells called nephroblastoma.