Peak Age for Streptococcal Tonsillitis

Age-Specific Epidemiology

The illness predominantly affects children aged 5-15 years, representing the highest risk group for Group A Streptococcus (GAS) pharyngitis/tonsillitis 1, 2, 3, 4, 5
This age range accounts for 15-30% of acute pharyngitis cases being streptococcal in origin 4

GAS pharyngitis/tonsillitis is uncommon in children younger than 3 years 1, 2, 4
Testing is generally not recommended for children under 3 years unless specific risk factors exist, such as an older sibling with documented GAS infection 1, 2, 4
The American Academy of Family Physicians and the Infectious Diseases Society of America recommend that children under 3 years should not be tested for GAS pharyngitis/tonsillitis unless specific risk factors exist 1, 2, 4
GAS causes only 5-15% of acute pharyngitis cases in adults 4, 5
Adults at higher risk include parents of school-age children and those whose occupation involves close contact with children, according to the Infectious Diseases Society of America 4

Streptococcal tonsillitis typically occurs in winter and early spring in temperate climates (November through May) 1, 3, 4, 5
The American Heart Association notes that acute rheumatic fever (the major complication) is also rare in children under 3 years in the United States 3