The negative publicity given to the vaccine in the mass media led some parents to refuse to immunize their children with the MMR vaccine.
The protein was then purified and used to immunize rabbits to raise polyclonal sera.
The intent was to immunize the world's children by methodically establishing sites where the masses could be reached.
Producing sufficient quantities of the vaccine to immunize all children against chickenpox has proven to be a major obstacle.
Diphtheria-tetanus-pertussis (DTP) vaccine-The standard vaccine used to immunize children against diphtheria, tetanus, and whooping cough.