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The social service officials responsible under section one hundred thirty-two for investigating any application for public assistance and care, shall maintain close contact with persons granted public assistance and care. Such persons shall be visited as frequently as is provided by the regulations of the department or required by the circumstances of the case, in order that any treatment or service tending to restore such persons to a condition of self-support and to relieve their distress may be rendered and in order that assistance or care may be given only in such amount and as long as necessary. Persons receiving care in an institution shall be visited as often as may be necessary in order that any service or care needed by them shall be provided and in order that institutional care shall be given only as long as it is advantageous for the person's welfare. The circumstances of a person receiving continued care shall be reinvestigated as frequently as the regulations of the department may require.