in the course of the two weeks following vaccination , laboratory-confirmed clinical influenza cases occurred in 4 subjects among the 110 volunteers of the control group which received placebo , and in 8 , 7 and 4 subjects respectively of the 3 groups of about 125 individuals , each of which received one of the following vaccine preparations : ( a ) , live attenuated a/victoria/3/75 influenza virus oral vaccine , grown on chick embryo kidney culture ;
C0021400
influenza
C0021403
influenza virus