FIG 4 .

Serotype-specific propensity of whether a given serotype/serogroup is more likely to be found as a primary or nonprimary isolate in PCV7-vaccinated (red) and PCV-unvaccinated (blue) children. Pneumococcal serotypes identified from nasopharyngeal swabs were classified according to whether they occurred as a primary or nonprimary isolate as determined by carriage density. Single colonizers were included in the analysis as primary isolates. The box at the top of the graph is an expanded view of the block in the lower left-hand corner of the graph. Green dots represent two or more serotypes with the same colonizing profile. Results were considered significant when the P value was <0.05, and these results are indicated by an asterisk.