Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Rheumatic Fever ?
    ### Response:
    Rheumatic fever is an inflammatory condition that may develop after infection with group A Streptococcus bacteria, such as strep throat or scarlet fever. It is primarily diagnosed in children between the ages of 6 and 16 and can affect the heart, joints, nervous system and/or skin.
    