Source:http://linkedlifedata.com/resource/umls/id/C0857515
NCI: In medicine, refers to a vaccination given after a previous vaccination. A booster helps maintain or increase a protective immune response.,CHV: vaccination that helps maintain or increase a protective immune response,CHV: vaccination that helps maintain or increase a protective immune response,CHV: vaccination that helps maintain or increase a protective immune response,NCI: A second or later vaccine dose, separated from the first by time, to increase, extend, or maintain the immune response of the previous vaccination.