Sero-response rates for placebo , BRV-TV dose-levels 10 ( 5.0 ) FFU , 10 ( 5.8 ) FFU , 10 ( 6.4 ) FFU , and Rotateq at 28 days post third dose were 11.1 % , 27.8 % , 41.2 % , 83.3 % , and 63.2 % respectively using the four-fold or more criteria .