Characterization of invasive Pneumococci of serogroup 6 from adults in Barcelona, Spain, in 1994 to 2008.

A total of 91 of 1,480 invasive isolates (6.1%) collected from adults in Barcelona, Spain, in the period of 1994 to 2008 were of serogroup 6 (6B, 47 isolates; 6A, 28; and 6C, 16). Throughout this period, serotype 6B (Spain(6B)-ST90) decreased, and serotype 6A remained stable. An increase in serotype 6C (ST224) in the 2004-2008 period was observed.