Homeless Persons: Persons who have no permanent residence. The concept excludes nomadic peoples.Public Housing: Housing subsidized by tax funds, usually intended for low income persons or families.Homeless Youth: Runaway and homeless children and adolescents living on the streets of cities and having no fixed place of residence.Mobile Health Units: Movable or portable facilities in which diagnostic and therapeutic services are provided to the community.Pediculus: Lice of the genus Pediculus, family Pediculidae. Pediculus humanus corporus is the human body louse and Pediculus humanus capitis is the human head louse.Health Planning Organizations: Organizations involved in all aspects of health planning activities.AlabamaBehavioral Medicine: The interdisciplinary field concerned with the development and integration of behavioral and biomedical science, knowledge, and techniques relevant to health and illness and the application of this knowledge and these techniques to prevention, diagnosis, treatment, and rehabilitation.Trench Fever: An intermittent fever characterized by intervals of chills, fever, and splenomegaly each of which may last as long as 40 hours. It is caused by BARTONELLA QUINTANA and transmitted by the human louse.Phthiraptera: An order of small, wingless parasitic insects, commonly known as lice. The suborders include ANOPLURA (sucking lice); AMBLYCERA; ISCHNOCERA; and Rhynchophthirina (elephant and warthog lice).Lice Infestations: Parasitic attack or subsistence on the skin by members of the order Phthiraptera, especially on humans by Pediculus humanus of the family Pediculidae. The hair of the head, eyelashes, and pubis is a frequent site of infestation. (From Dorland, 28th ed; Stedman, 26th ed)Housing: Living facilities for humans.Los AngelesTokyoAttitude to Death: Conceptual response of the person to the various aspects of death, which are based on individual psychosocial and cultural experience.Tuberculosis: Any of the infectious diseases of man and other animals caused by species of MYCOBACTERIUM.Substance-Related Disorders: Disorders related to substance abuse.Health Services Accessibility: The degree to which individuals are inhibited or facilitated in their ability to gain entry to and to receive care and services from the health care system. Factors influencing this ability include geographic, architectural, transportational, and financial considerations, among others.Terminal Care: Medical and nursing care of patients in the terminal stage of an illness.Infectious Disease Transmission, Patient-to-Professional: The transmission of infectious disease or pathogens from patients to health professionals or health care workers. It includes transmission via direct or indirect exposure to bacterial, fungal, parasitic, or viral agents.