Univariate analysis for factors associated with carriage of single or multiple strains of Streptococcus pneumoniae.

aPCV7 = 7-valent conjugated pneumococcal polysaccharide vaccine.bNo information was available about age for 7 patients.cNo information was available about gender for 4 patients.dAntibiotic treatment during the 8 weeks before swab collection, no information was available for 108 patients (9.6%).eNo information about current day care use was available for 152 patients (13.5%).fMore than one otitis media episode during the past 12 months. No information was available about recurrent otitis media for 183 patients (16.3%).gVaccination with the seven-valent conjugated pneumococcal vaccine.No information about vaccination status was available for 100 patients (8.9%). P-value is for the comparison between carriage of single or multiple strains of S. pneumoniae versus no carriage.