How many people fall victim to rheumatic fever?

Question

and on a scale to 1 to 10 how dangerous is it

Answer 1

Rheumatic fever is not common, but over three million people in America fall victim to it each year.

Incidence (annual) of Rheumatic fever: 12 per 1000 (NHIS95)

Incidence Rate: approx 1 in 83 or 1.20% or 3.3 million people in USA
Incidence extrapolations for USA for Rheumatic fever: 3,264,000 per year, 272,000 per month, 62,769 per week, 8,942 per day, 372 per hour, 6 per minute.

How dangerous it is depends upon the patient, and how severly the react to the disease.