as part of a study with a quadruple inactivated vaccine ( diphtheria-pertussis-tetanus-polio ) , the serologic response to the pertussis antigen was investigated in infants at the age of routine immunization , inoculated with one of the following two regimens : either 0.5 ml vaccine at 2 and 3 1/2 months and a booster six months later , or an identical dose of vaccine given at 2 , 4 and 6 months and a booster at the age of 12 months .
C0042212
inactivated vaccine
C0042210
vaccine