From the Constitution of the Pan American Health Organization:
Article 2. Membership:
A. All American States are entitled to membership in the Organization. (American States which are Members of the Organization are hereinafter called Member Governments.)
B. Territories or groups of territories within the Western Hemisphere which are not responsible for the conduct of their international relations shall have the right to be represented and to participate in the Organization. The nature and extent of the rights and obligations of these territories or groups of territories in the Organization shall be determined in each case by the Directing Council after consultation with the Government or other authorities having responsibility for their international relations (hereinafter called Participating Governments).
It is understood that Member Governments having under their jurisdiction subordinate territories and peoples within the Western Hemisphere will apply the provisions of the Pan American Sanitary Code and of this Constitution to such territories and peoples.