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HaematuriaPresence of blood in the urine.
Haemoptysis (or Hemoptysis)Expectoration (coughing up) of blood or of blood-stained spit from the bronchi, larynx, trachea, or lungs.
HaemorrhageBleeding.
Heaf testThe tuberculin test performed by driving six short needles into the skin (the dermis) through a drop of concentrated tuberculin by means of a spring-loaded ‘Heaf gun’.
HistologyStudying cells and tissues at a microscopic level.
HIVHuman immunodeficiency virus. The cause of HIV disease (below) and AIDS.
HIV diseaseThe clinical features resulting from HIV infection ranging from no symptoms through increased susceptibility to common infections to the more serious stage of AIDS. HIV disease can now be treated (but not cured) with anti-viral drugs.
HIV positiveSomeone who has tested positive for HIV. HIV positive people are referred to on this site as people living with HIV (PLHIV).
Hong Kong operationA radical operation to prevent and correct deformity in cases of spinal tuberculosis.
HydrocephalusAccumulation of cerebrospinal fluid in chambers (ventricles) within the brain.  The pressure causes severe damage to the brain and, in infants with pliable skull bones, swelling of the head.  It is a serious complication of tuberculous meningitis and requires surgical decompression by means of a valve.
HydronephrosisAbnormal enlargement of a kidney due to obstruction of the flow of urine.
Hypersensitivity reactionAn immunological reaction that does more damage to the host than to the causative agent of the reaction.

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