FIG 2 .

Prevalence of nasopharyngeal (NP) pneumococcal colonization in PCV7-vaccinated and PCV-unvaccinated, HIV-uninfected children who were 9 months old (A) and 16 months old (B). The P values were determined by multivariate logistic regression, controlling for race, smoking household contact, co-trimoxazole use, day care attendance, and mean age at the time of sample collection by using generalized estimating equations. P values of <0.05 were considered significant. PCV7, seven-valent pneumococcal conjugate vaccine.