Streptococcal sore throat, or strep throat as it is more commonly called, is an infection caused by group A Streptococcus bacteria. The main target of the infection is the mucous membranes lining the pharynx. Sometimes the tonsils are also infected (tonsillitis). If left untreated, the infection can develop into rheumatic fever or other serious conditions.

Strep throat is a common malady, accounting for 5-10% of all sore throats. Strep throat is most common in school age children. Children under age two are less likely to get the disease. Adults who smoke, are fatigued, or who live in damp, crowded conditions also develop the disease at higher rates than the general population.

The malady is seasonal. Strep throat occurs most frequently from November to April. In these winter months, the disease passes directly from person to person by coughing, sneezing, and close contact. Very occasionally the disease...