Using predefined illness and infection definitions , vaccination did not meet the primary endpoint , but self-reported cases of severe ( 0 % vaccinees vs. 8.3 % controls ; P = .054 ) , moderate or greater ( 6.0 % vs. 18.8 % ; P = .068 ) , and mild or greater severity of vomiting and/or diarrhea ( 20.0 % vs. 37.5 % ; P = .074 ) were less frequent .