The relative risks ( and 95 % confidence intervals ) to carry S. pneumoniae penicillin-nonsusceptible , resistant to > or = 1 , > or = 2 and > or = 3 antibiotic categories among younger siblings of PnCRM9 recipients vs. siblings of controls were 0.47 ( 0.31 to 0.70 ) , 0.49 ( 0.33 to 0.71 ) , 0.46 ( 0.30 to 0.73 ) and 0.49 ( 0.21 to 1.17 ) , respectively .
