STs described in the current study are indicated with arrows and boxes. The size of each circle is proportional to the number of isolates of that ST, the blue circle indicates the founder, ST247, of the entire clonal complex, and the yellow circles indicate subgroup founders (STs that have at least two single-locus variants). Strains from the ST247 founder complex have been recovered throughout Europe, South America, and the US (ST2365 recovered only in the US), from 1978 to 2005. The allelic profile of ST247 is aroE 16, gdh 13, gki 4, recP 5, spi 6, xpt 10, and ddl 14. Strains from the ST246 subgroup have been detected in Spain, Australia, and the United Kingdom from 1997 to 2005; strains from the ST899 subgroup have been recovered in the US and the Czech Republic from 1999 to 2002; and strains of the ST695 subgroup have been detected in the US and South Africa from 1999 to 2005. Pneumococcal strains of all STs in this diagram are serotype 4 except where indicated; however, the serotype 19A strains have only been reported in the US to date, and only since 2003. P1, P1var6, P2, and P3 refer to the type of progeny strains (see ).