Hiv (human Immunodeficiency Virus): From 1 Different Sources
The name of the causative agent of AIDS.
The virus that causes glandular fever or infectious MONONUCLEOSIS. It is similar to the viruses that cause herpes and is associated with BURKITT’S LYMPHOMA. It has been suggested as precipitating some attacks of MYALGIC ENCEPHALOMYELITIS (ME), also known as CHRONIC FATIGUE SYNDROME (CFS).... epstein barr virus
A glycoprotein hormone secreted by the PLACENTA in early pregnancy, and stimulating the CORPUS LUTEUM within the ovary (see OVARIES) to secrete OESTROGENS, PROGESTERONE, and relaxin. The hormone is essential for the maintenance of pregnancy up to about 6–8 weeks of gestation. A RADIOIMMUNOASSAY can be used to detect its presence, and pregnancy can be diagnosed as early as six days after conception by testing for it in the urine. Some tumours also secrete human chorionic gonadotrophin, particularly HYDATIDIFORM MOLE, which produces large amounts.... human chorionic gonadotrophin
An extremely small infective agent requiring living cells for replication. Are either RNA or DNA, never both.... virus
In simple terms, this is the genetic recipe for making a human being. GENOME is a combination of the words gene and chromosome, and a genome is de?ned as all the genetic material – known as deoxyribonucleic acid, or DNA – in a cell. Most genes encode sequences of AMINO ACIDS, the constituents of proteins, thus initiating and controlling the replication of an organism. The identi?cation and characterisation of the human genetic puzzle have been a key bioscience research target. The Human Genome Project was launched in 1990 (and completed in 2003) to produce a full sequence of the three million base pairs that make up the human genome.
Carried out as two separate exercises – one by a privately funded American team; another by an international joint venture between tax-funded American laboratories, a charitably funded British one and several other smaller research teams from around the world – the ?rst results were announced on 26 June 2000. In February 2001 the privately funded American group, known as Celera Genomics, announced that it had identi?ed 26,558 genes. At the same time the Human Genome Project consortium reported that it had identi?ed 31,000. Allowing for margins of error, this gives a ?gure much lower than the 100,000 or more human genes previously forecast by scientists. Interestingly, genes were found to make up only 3 per cent of the human genome. The remaining 97 per cent of the genome comprises non-coding DNA which, though not involved in producing the protein-initiating genetic activity, does have signi?cant roles in the structure, function and evolution of the genome.
One surprise from the Project so far is that the genetic di?erences between humans and other species seem much smaller than previously expected. For example, the Celera team found that people have only 300 genes that mice do not have; yet, the common ancestor of mice and men probably lived 100 million years or more in the past. Mice and humans, however, have around twice as many genes as the humble fruit ?y.
Cells die out when they become redundant during embryonic development: genes also die out during evolution, according to evidence from the Genome Project – a ?nding that supports the constant evolutionary changes apparent in living things; the Darwinian concept of survival of the ?ttest.
Apart from expanding our scienti?c knowledge, the new information – and promise of much more as the Genome Project continues – should enhance and expand the use of genetic engineering in the prevention and cure of disease. Studies are in progress on the gene for a receptor protein in the brain which will shed light on how the important neurotransmitter SEROTONIN in the brain works, and this, for example, should help the development of better drugs for the treatment of DEPRESSION. Another gene has been found that is relevant to the development of ASTHMA and yet another that is involved in the production of amyloid, a complex protein which is deposited in excessive amounts in both DOWN’S (DOWN) SYNDROME and ALZHEIMER’S DISEASE.... human genome
A mosquito-borne viral infection that is normally harmless to healthy people who, if infected, develop a mild ?u-like illness. However, if the elderly and those in poor health, particularly immunocompromised patients, are infected, they may develop fatal in?ammation of the brain and spinal cord. In Israel in 2000, 12 people died and more than 155 survived an outbreak; and in New York in 1999, more than 60 people were infected, of whom six died. The disease was ?rst reported in Uganda in 1937 and became ENDEMIC in the Middle East and Africa, recently spreading to Europe, central Asia, Oceania and America. Mosquitoes bearing the ?aviviridae-family virus usually contract it by biting infected poultry, but the infection has been found in mammals, such as cats, dogs and horses.... west nile virus
A mosquito-borne arbovirus causing symptoms similar to Ross River virus infection in Australia. (See also Ross River virus).... barmah forest virus
A group of viruses so-called because they were ?rst isolated from two patients with a disease resembling paralytic POLIOMYELITIS, in the village of Coxsackie in New York State. Thirty distinct types have now been identi?ed. They constitute one of the three groups of viruses included in the family of ENTEROVIRUSES, and are divided into two groups: A and B. Despite the large number of types of group A virus (24) in existence, evidence of their role in causing human disease is limited. Some, however, cause aseptic MENINGITIS, non-specicifc upper respiratory infection and MYOCARDITIS, and others cause a condition known as HERPANGINA. HAND, FOOT AND MOUTH DISEASE is another disease caused by the A group. All six types of group B virus have been associated with outbreaks of aseptic meningitis, and they are also the cause of BORNHOLM DISEASE. Epidemics of type B2 infections tend to occur in alternate years. (See VIRUS.)... coxsackie viruses
Virus of Flying Foxes (Fruit Bats) in Australia. Can infect horses and humans. Also known as the Equine morbillivirus.... hendra virus
The most common causes of viral hepatitis are those caused by the Hepatitis A, B, C, D, E and G viruses. Hepatitis F virus has been described but is a doubtful entity. Other viruses which can cause hepatitis include the Epstein-Barr Virus, cytomegalovirus, and the Yellow Fever virus.... hepatitis viruses
Causative virus of genital herpes and herpes labalis or cold sores.... herpes simplex virus
One member of a group of viruses containing DNA which cause latent infections in animals and humans. Viruses from this group cause HERPES SIMPLEX, HERPES ZOSTER (shingles) and CHICKENPOX, and include CYTOMEGALOVIRUS (CCMV) and EPSTEIN-BARR VIRUS.... herpes viruses
Causative virus of chicken pox and shingles.... herpes zoster virus
Human skills and capabilities generated by investments in education and health.... human capital
A composite index that measures the overall achievements in a country in three basic dimensions of human development— longevity, knowledge and a decent standard of living. It is measured by life expectancy, educational attainment and adjusted income per capita in purchasing power parity (PPP) US dollars. The HDI is a summary, not a comprehensive measure of human development.... human development index (hdi)
See ASSISTED CONCEPTION.... human fertilisation & embryology act 1990
See ASSISTED CONCEPTION.... human fertilisation & embryology authority (hfea)
See AIDS/HIV.... human immunodeficiency virus
See HLA SYSTEM.... human leucocyte antigen (hla)
UK legislation that lays down the framework and rules governing organ transplantation. The UK Transplant Support Service Authority (UKTSSA), a special health authority set up in 1991, is responsible for administering the NHS Organ Donor Registry and the Act (see APPENDIX 7: STATUTORY ORGANISATIONS).... human organs transplants act
The study of the interrelationships between humans, the tools they use, and the environment in which they live and work.... human-factor research
Impaired IMMUNITY resulting from inherited or acquired abnormalities of the immune system. This leads to increased vulnerability to infection. Important inherited examples of immunode?ciency are defects in function of GRANULOCYTES and the COMPLEMENT SYSTEM. Common acquired forms of immunode?ciency are defective function of B-type lymphocytes and hence antibody de?ciency in ‘common variable hypogammaglobulinaemia’, and grossly de?cient CD4 T-cell function – malfunctioning T-type lymphocytes – in AIDS, secondary to HIV infection (see AIDS/HIV).... immunodeficiency
A group of rhabdoviruses closely related to the rabies virus. The Australian Bat Lyssa virus is found in flying foxes (fruit bats) and can cause a rabies-like disease in humans. The disease should be handled as for rabies and can be prevented by using rabies vaccine.... lyssa virus
A herpes virus of monkeys that can infect humans, usually through handling monkey tissues at autopsy or in the laboratory.... monkey b virus
Virus first identified from the village of Nipah in Malaysia. Carried by flying foxes (fruit bats). Can infect pigs and humans.... nipah virus
These include the human papilloma viruses (HPV), of which nearly a hundred strains have been identi?ed. HPV cause verrucae (see WARTS) on skin and, less often, on the mucous membranes of mouth, larynx, genitalia and the cervix. Some strains may predispose to eventual cancer.... papova viruses
These are included in the paramyxoviruses (see MYXOVIRUSES) and divided into four types, all of which cause infection of the respiratory system (see RESPIRATION). Infection with type 3 begins in May, reaches a maximum in July or August and returns to base-line level in October. Types 1 and 2 are predominantly winter viruses. Children are commonly affected and the manifestations include CROUP, fever, and a rash.... parainfluenza viruses
These infectious agents derive their name from pico (small) and from RNA (because they contain ribonuleic acid). They are a group of viruses which includes the ENTEROVIRUSES and the RHINOVIRUSES.... picorna viruses
Usually known as RSV, this is one of the MYXOVIRUSES. It is among the major causes of BRONCHIOLITIS and PNEUMONIA among infants aged under 6 months; its incidence has been increasing, possibly due to atmospheric pollution.... respiratory syncytial virus (rsv)
A mosquito-borne arbovirus causing epidemic polyarthritis in Australia and certain islands of the Western Pacific to which it has spread.... ross river virus
Creutzfeldt-Jakob disease. See: BOVINE SPONGIFORM ENCEPHALOPATHY. ... mad-cow disease, human
Wounds caused by one person biting another. Human bites rarely cause serious tissue damage or blood loss, but infection is likely, particularly if the bite is deep. There is a risk of tetanus infection. Transmission of hepatitis B, herpes simplex, and AIDS by a bite is a theoretical hazard.... bites, human
A virus that causes infectious mononucleosis; the virus is also associated with Burkitt’s lymphoma and cancer of the nasopharynx (see nasopharynx, cancer of).... epstein–barr virus
The complete set of human genetic material. The human genome consists of 23 chromosomes, which, together, contain about 30,000 genes. All body cells contain 2 sets of the 23 chromosomes, one set inherited from the father and the other from the mother. An international research programme, the Human Genome Project, was launched in 1990 with the aim of identifying all the human genes. The first rough draft of the project was published in 2000.... genome, human
A hormone produced by the placenta in early pregnancy. Human chorionic gonadotrophin (HCG) stimulates the ovaries to produce oestrogen and progesterone, which are needed for a healthy pregnancy. HCG is excreted in the urine, and its presence in urine is the basis of pregnancy tests on urine samples. ... gonadotrophin, human chorionic
(HLA) A type of protein belonging to the group known as histocompatibility antigens, which play a role in the immune system.... human leukocyte antigen
A group of diseases of the central nervous system that occur many months or even years after infection with a virus. They cause gradual widespread destruction of nerve tissue, with progressive loss of brain function and a fatal outcome. Examples include Creutzfeldt–Jakob disease and kuru.... slow virus diseases
(HHS) the major US government agency providing health care. The department was created in 1953 and assumed its current name in 1980. HHS administers more than 300 health and health-related programmes and services, including *Medicare and *Medicaid. Other activities include research, immunization services, and providing financial assistance for low-income families. Almost a quarter of federal spending occurs through HHS.... department of health and human services
a nondepartmental public body set up in 2007 to promote human rights and equality in regard to age, disability, gender, race, religion and belief, pregnancy and maternity, marriage and civil partnership, sexual orientation, and human rights. It replaced the Commission for Racial Equality, the Disability Rights Commission, and the Equal Opportunities Commission.... equality and human rights commission
see human placental lactogen.... human chorionic somatomammotrophin
(echovirus) one of a group of RNA-containing viruses that are able to multiply in the gastrointestinal tract (see enterovirus). About 30 different types exist. Type A Coxsackie viruses generally cause less severe and less well-defined diseases, such as *hand, foot, and mouth disease, although some cause meningitis and severe throat infections (see herpangina). Type B Coxsackie viruses cause inflammation or degeneration of heart tissue, resulting in pericarditis or myocarditis, or brain tissue, producing meningitis or encephalitis. They can also attack the muscles of the chest wall, the bronchi, pancreas, thyroid, or conjunctiva and recent evidence suggests they may be implicated in diabetes in children and in motor neuron disease. See also Bornholm disease.... coxsackie virus
a virus responsible for an acute infection in humans with features similar to those of *Marburg disease. Transmission is by contact with infected blood and other body fluids and the incubation period is 2–21 days (7 days on average). The mortality rate is 53–88%, but intensive treatment (including rehydration) in the early stages of the disease can halt its rapid and usually irreversible progression to haemorrhaging of internal organs. Until recently, sporadic but short-lived outbreaks have occurred in Africa since 1976, when the virus was first identified during an outbreak in the region of the Ebola river, in Zaïre (now Democratic Republic of Congo). A major epidemic of the disease broke out in West Africa at the end of 2013 and lasted until May 2016: over 11,000 people died. An unknown species of animal – possibly a fruit bat – is assumed to act as a reservoir for the virus between outbreaks of the disease in humans.... ebola virus
Acts of the UK parliament in 1990 and 2008, establishing and amending principles for the legal supervision, by the Human Fertilisation and Embryology Authority, of the creation, use, and storage of human embryos outside the body and of their use in treatment and research. The 2008 amendments included a ban on sex selection for social reasons, recognition of same-sex couples as potential legal parents, and regulations related to developing areas of research using embryos. The 1990 Act had also reduced the legal time limit for most abortions from 28 weeks gestation (as in the 1967 Abortion Act) to 24 weeks. Interpretation and regulation of principles and practice in this rapidly developing area of research and practice continue and are often controversial.... human fertilisation and embryology acts
a massive international research project to isolate all the genes in human DNA and determine the sequence of genes on human chromosomes. The project began in 1988 and the full draft sequence was published in 2001; the high-quality sequence was completed in 2003. The human genome comprises some 3 × 109 nucleotide base pairs (see DNA) forming 22,000–25,000 genes, distributed among 23 pairs of chromosomes. Knowledge of the entire human genome has already resulted in the identification of the genes associated with many hereditary disorders and revealed the existence of a genetic basis or component for many other diseases not previously known to have one. Theoretically, this would enable the development of targeted drugs and the large-scale genetic screening of populations. See pharmacogenomics; targeted agent.... human genome project
see HIV.... human immunodeficiency virus
see HLA system.... human leucocyte antigen system
commercially available preparations of *follicle-stimulating hormone and *luteinizing hormone. They are used mainly to treat infertility in women with gonadotrophin deficiency due to hypopituitarism and to stimulate superovulation in women undergoing in vitro fertilization.... human menopausal gonadotrophins
(human chorionic somatomammotrophin) a protein hormone of 190 amino acids produced by the placenta during most but not all pregnancies. Despite its name it does not appear to have a role in lactation and its exact function remains obscure. It does, however, seem to contribute to the development of diabetes in some pregnancies.... human placental lactogen
a legal framework adopted by the United Nations following World War II that sought to define and promote fundamental entitlements, conditions, and freedoms to be afforded to all human beings. In the UK the Human Rights Act 1998 enacts the provisions of the 1950 European Convention on Human Rights, which sets out, via fourteen articles, an individual’s rights, entitlements, and freedoms.... human rights
the UK government agency, established by the Human Tissue Act 2004, that regulates the removal, use, and storage of human organs and tissue from both the living and the deceased for certain purposes as defined by the statute. These purposes include clinical research, clinical audit, and medical education. Anyone handling such material for those purposes should have a licence issued by the authority. Membership of the authority comprises clinical, scientific, academic, and lay representatives.... human tissue authority
n. deficiency in the *immune response. This can be acquired, as in *AIDS, but there are many varieties of primary immunodeficiency occurring as inherited disorders characterized by *hypogammaglobulinaemia or defects in T-cell function, or both.... immunodeficiency
a group of large RNA-containing viruses that cause infections of the respiratory tract producing mild influenza-like symptoms. They are included in the paramyxovirus group (see myxovirus).... parainfluenza viruses
(RSV) a paramyxovirus (see myxovirus) that causes infections of the nose and throat. It is a major cause of bronchiolitis and pneumonia in young children. In tissue cultures infected with the virus, cells merge together to form a conglomerate (syncytium). RSV is thought to have a role in *sudden infant death syndrome. Vulnerable children can be treated with *ribavirin, but most children just require supportive measures.... respiratory syncytial virus
a mosquito-borne virus that usually causes mild symptoms in humans, including fever, skin rashes, muscle and joint pain, and headache. However, infection during pregnancy can result in brain abnormalities of the fetus, notably *microcephaly. Zika virus can also trigger *Guillain–Barré syndrome. Infection is usually from a mosquito bite, although the virus may also be transmitted by sexual intercourse.... zika virus
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