Inspite of such concentration of health facilities in the cities compared to rural areas and relative proximity of hospital and other facilities, standards of health care seem to have fallen far below reasonable minimum levels for those who live in slums. There is a phenomenon of an "inverse care law", whereby, those who are in greatest need of medical care have poorest access to it. While the principles of delivery of primary health care are equally applicable to urban health system as to the rural health, the slum population remains ignored on this account to this date.