Columbia subject headings:
Communicable diseases--United States--Prevention.
Epidemics--United States--Prevention.
Public health surveillance--United States.
Harvard subject headings:
Communicable diseases--United States--Prevention.
Emerging infectious diseases--United States--Prevention.
Epidemics--United States--Prevention.
Public health surveillance--United States.
Princeton subject headings:
Communicable diseases--Prevention.
Communicable diseases--United States--Prevention.
Epidemics--Prevention.
Public health surveillance.