Seroconversion for type 2 was noted in 16 infants ( 9 % , 5-14 ) on bOPV short , 29 ( 16 % , 11-22 ) on bOPV standard , 19 ( 10 % , 7-15 ) on mOPV short , 33 ( 18 % , 13-25 ) on mOPV1 standard , and 182 ( 96 % , 92-98 ) on tOPV standard .