Columbia subject headings:
Medical policy--United States.
Swine influenza--Vaccination--Political aspects--United States.
Swine influenza--Vaccination--United States.
Harvard subject headings:
Medical policy--United States
Swine influenza--United States--Vaccination.
Swine influenza--Vaccination--Political aspects--United States.
Swine influenza--Vaccination--United States.
Princeton subject headings:
Medical policy--United States.
Swine influenza--United States--Vaccination.
Swine influenza--Vaccination--Political aspects--United States.