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Rheumatic fever ( RF ) and rheumatic heart disease ( RHD ) are the multisystem autoimmune sequel of group A streptococci ( GAS ) infection of the upper respiratory passages , mainly tonsillopharyngitis .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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