in the present vaccination trial , 202 seronegative schoolchildren comprising both sexes and aged 11 to 12 years were vaccinated i.m . in the upper arm with either the subunit vaccine at a dosage of 600 cca or 200 cca or with a whole-virus vaccine at a dosage of 200 cca , using the double-blind procedure .
C0887892
subunit vaccine
C0042210
vaccine