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. 2007 Jun 4;51(8):2690–2700. doi: 10.1128/AAC.00258-07

FIG. 1.

FIG. 1.

Minimum evolution tree showing relationship based on concatenated sequences of six housekeeping genes. The tree was constructed by the neighbor-joining method using MEGA 3.1. Isolates included in group A are those of the typical S. pneumoniae group and ATCC 49619 (Table 1) and are indicated by ○. ▪ represents the viridans streptococcal group, and ▵ or ▴ represents the “atypical pneumococcal” group. Isolates in group B included S. mitis ATCC 49456 and mainly “atypical pneumococcal” strains. Isolates in group C included the viridans streptococcal group and S. oralis ATCC 10557.