The 15 g dosage elicited a seroprotective hemagglutination inhibition ( 1:40 ) in 20 % , 47 % and 93 % of children in the 6-35 month , 3-9 year and 10-17 year age strata 21 days after dose 1 and in 78 % , 82 % and 98 % of children 21 days after dose 2 , respectively .