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Relationship between serotype-specific RRs and epidemiologic and microbiological measures. Serotype specific RR among pneumonia cases is related to (a) carriage prevalence in a pediatric study in England (number of nasopharyngeal isolates) [22], (b) invasiveness [22], and (c) degree of encapsulation (area in pixels) [18]. There were no carriage isolates for types 1 or 5.
