rheumatic fever
US /ˌruːˈmæt.ɪk ˈfiː.vər/
UK /ˌruːˈmæt.ɪk ˈfiː.vər/

1.
an inflammatory disease that can develop as a complication of inadequately treated strep throat or scarlet fever. It can affect the heart, joints, brain, and skin.
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Untreated strep throat can lead to rheumatic fever.
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The child was diagnosed with rheumatic fever after experiencing joint pain and fever.