The membership of the PCB comprises 22 Member States, elected from among the Member States of the Cosponsoring Organizations, with the following regional distribution:

Western European and Others Group - 7 seats

Africa - 5 seats

Asia and Pacific - 5 seats

Latin America and the Caribbean-  3 seats

Eastern European/Commonwealth of Independent States-  2 seats

The term of membership of these 22 members shall be three years.

The initial terms of members shall vary in order to achieve a staggering of membership. After the initial elections, approximately one third of the membership shall be replaced annually.

Each of the Cosponsors shall have full rights of participation in the PCB but without the right to vote (see the terms of reference of the CCO in Annex 1 of this Modus Operandi).

Five nongovernmental organizations (NGOs), three from developing countries and two from the developed countries or countries with economies in transition, shall be invited to participate in meetings of the PCB but without the right to take part in the formal decision-making process and without the right to vote (ECOSOC resolution 1995/2 refers).

The selection of the five nongovernmental organizations would be determined by the NGOs themselves from among those either in consultative status with ECOSOC or in relationship with one of the cosponsoring organizations or on the roster of NGOs dealing with matters pertaining to HIV/AIDS. The PCB shall formally approve the NGOs nominated. The terms of office of the selected NGOs shall not exceed three years.