Group A beta hemolytic streptococci. Most common in children aged 5 to 10 especially during the months of October to April. Time from contact to the development of signs and symptoms usually 28 to 72 hours after close contact.
Incidence is highest among small children.
Occasionally by contaminated food. Treated cases usually do not transmit after 48 hours. Untreated cases can transmit as long as 21 days. Stressing the need for bed rest and isolation from others until antibiotic treatment is effective, completing medication, handwashing and properly disposing of soiled tissues. A child must be on antibiotic for 48 hours before returning to school.