The onset of rheumatic fever usually occurs about two to four weeks after a strep
What age group is most affected by rheumatic fever?
Children Most Often Affected
Although anyone can get rheumatic fever, it is more common in school-age children (5 through 15 years old). Rheumatic fever is very rare in children younger than three years old and adults.
How often does strep throat lead to rheumatic fever?
Key points. Rheumatic fever is a complication of a strep throat. About three people out of every 10 who have a strep throat infection develop rheumatic fever.