Columbia subject headings:
Immunization of children--United States.
Vaccines industry--United States.
Vaccines--Government policy--United States.
Harvard subject headings:
Immunization of children--United States.
Vaccines industry--United States.
Vaccines--Government policy--United States.
Princeton subject headings:
Immunization of children--United States.
Vaccines industry--United States.
Vaccines--Government policy--United States.