What is the progression for rheumatic fever?

Variable: Depends. Hopefully minimal repercussions if treated early and if appropriate antibiotic therapy continued for many years. If inflammation ensues in a chronic fashion then gradual thickening and potentially leakiness of one or more of the heart valves may occur. Occasionally rhythm disturbances such as atrial fibrillation can develop down the road.

Strep throat: It is caused by group A beta-haemolytic streptococci.The disease affects joints, skin, heart and nervous system. The incidence is highest in school-aged children.Symptoms appear between one and five weeks after a sore throat, with an average of three weeks. Diagnosis is based on Jones Criteria. http://patient.info/doctor/rheumatic-fever-pro