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We read the papers of Bratcher and Nahm ([3][1]) and Oftadeh et al. ([8][2]) with interest. Both papers reported that Streptococcus pneumoniae serotype 6D isolates react with factor antiserum specific to serotype 6C in addition to that to 6B. Pneumococcal serotype 6C, first reported in 2007, cross-

Streptococcus pneumoniae Serotype 6D Cross-Reacting with Serotype 6A, 6B, and 6C Factor Sera