Overview
Strep throat is an infection in the throat and tonsils (glands in the back of the throat) that is caused by a bacterium known as Group A streptococcus. Strep throat spreads from person to person very easily, especially among family members. It is common in school-aged children but also occurs in adults.
Strep throat can very rarely cause more serious illnesses, such as rheumatic fever, a disease that can harm the heart valves. So, it's important that strep throat is appropriately diagnosed and treated. With proper treatment, strep throat is usually cured within 10 days.