The doctor is saying possible scarlet fever
. But, Strep Group A can cause a variety of
invasive types of
illnessness secondary to the original strep throat. these are rheumatic fever, scarlet fever, endocarditis, glomerulonephritis. They need to determine if he got any of these complications (which are rare) .By doing more tests. Did they ever culture Group A strep from his throat? It takes a few months for the ASO titer to go down and also for the lymph nodes to go down.