The Primary Health Centre (PHC) is the basic structural and functional unit of the public health services in developing countries. PHCs were established to provide accessible; affordable and available primary health care to people; in accordance with the Alma Ata Declaration of 1978 by the member nations of the World Health Organisation WHO. Description In South Asia; PHCs are the basic first - line units providing primary health care. Theoretically; there is one PHC for every 30;000 of population. Each PHC has five or six sub - centres staffed by health workers for outreach services such as immunization; basic curative care services; and maternal and child health services. PHCs generally consist of one or more doctors; a pharmacist; a staff nurse; and other paramedical support staff. GOBI - FFF is a model of a PHC. In India; PHCs form a basic part of the health care system. The Medical Officer appointed to run the PHC must be a MBBS degree holder. In addition to the provision of diagnostic and curative services; the Medical Officer acts as the primary administrator for the PHC. The primary field staff; who provide outreach services; are called "ASHA (Accredited Social Health Activist)" or a village health nurse; depending upon the Indian state where the PHC is located. The village health nurse provides service at the point of care; often in the patient's home. If additional diagnostic testing or clinical intervention is required; the patient is transported to the PHC to be evaluated by the Medical Officer. Under the national rural health mission; PHCs are rapidly being upgraded.