Human Immunodeficiency Virus
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HIV & AIDS May 19, 2013 | 5 / 5 (1) | 0
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HIV & AIDS May 18, 2013 | 5 / 5 (2) | 0
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Elizabeth D. Lowenthal, M.D., M.S.C.E., of the University of Pennsylvania Perelman School of Medicine and Children's Hospital of Philadelphia, and colleagues conducted a study to determine whether there was a difference in ...
HIV & AIDS Apr 30, 2013 | not rated yet | 0
Long-term use of highly active antiretroviral therapies (HAART) does not appear to be associated with impaired heart function in children and adolescents in a study that sought to determine the cardiac effects of prolonged ...
Pediatrics Apr 22, 2013 | not rated yet | 0
Studies have shown that about 10 percent of men infected with human immunodeficiency virus (HIV) have an elevated resting energy expenditure (REE). Their bodies use more kilocalories for basic functions including circulation, ...
HIV & AIDS Apr 16, 2013 | not rated yet | 0
Cocaine, already a damaging drug for those with healthy immune systems, can be lethal for those living with human immunodeficiency virus (HIV). Mudit Tyagi, Ph.D., assistant professor of medicine at the George Washington ...
HIV & AIDS Mar 21, 2013 | not rated yet | 0
A small French study of 14 HIV patients who have remained healthy for years after stopping drug treatment offers fresh evidence that early medical intervention may lead to a "functional cure" for AIDS, researchers said Thursday.
HIV & AIDS Mar 14, 2013 | not rated yet | 0
(Medical Xpress)—Nanoparticles carrying a toxin found in bee venom can destroy human immunodeficiency virus (HIV) while leaving surrounding cells unharmed, researchers at Washington University School of ...
HIV & AIDS Mar 08, 2013 | 5 / 5 (29) | 3 |
A study that analyzed data from more than 82,000 veterans suggests that infection with the human immunodeficiency virus (HIV) was associated with an increased risk of acute myocardial infarction (AMI, heart attack) beyond ...
HIV & AIDS Mar 04, 2013 | not rated yet | 0 |
A study led by researchers at Boston University School of Medicine (BUSM) has identified epigenetic mechanisms that connect a variety of diseases associated with inflammation. Utilizing molecular analyses of gene expression ...
Immunology Mar 01, 2013 | 4.8 / 5 (6) | 0 |
Reprogrammed immune cells might give doctors an edge in rallying the body's defenses against tumor growth
Genetic abnormalities accrued by tumor cells lead to inappropriate production of proteins at the wrong time or place, or even the synthesis of unusual hybrid proteins not found in normal cells. Such abnormalities ...
Cancer Mar 01, 2013 | 5 / 5 (2) | 0
Patients who are started on antiretroviral therapy for HIV-1 infection within four months of estimated infection date—and who have higher counts of CD4+ T-cells at the initiation of therapy—demonstrate a stronger recovery ...
HIV & AIDS Jan 16, 2013 | not rated yet | 0 |
An Australian scientist said Wednesday he had discovered a way to turn the HIV virus against itself in human cells in the laboratory, in an important advance in the quest for an AIDS cure.
HIV & AIDS Jan 16, 2013 | 4.9 / 5 (15) | 22
Human immunodeficiency virus (HIV) may have affected humans for much longer than is currently believed. Alfred Roca, an assistant professor in the College of Agricultural, Consumer and Environmental Sciences at the University ...
HIV & AIDS Dec 18, 2012 | 5 / 5 (3) | 3 |
Human immunodeficiency virus (HIV) is a lentivirus (a member of the retrovirus family) that causes acquired immunodeficiency syndrome (AIDS), a condition in humans in which progressive failure of the immune system allows life-threatening opportunistic infections and cancers to thrive. Infection with HIV occurs by the transfer of blood, semen, vaginal fluid, pre-ejaculate, or breast milk. Within these bodily fluids, HIV is present as both free virus particles and virus within infected immune cells. The four major routes of transmission are unsafe sex, contaminated needles, breast milk, and transmission from an infected mother to her baby at birth (perinatal transmission). Screening of blood products for HIV has largely eliminated transmission through blood transfusions or infected blood products in the developed world.
HIV infection in humans is considered pandemic by the World Health Organization (WHO). Nevertheless, complacency about HIV may play a key role in HIV risk. From its discovery in 1981 to 2006, AIDS killed more than 25 million people. HIV infects about 0.6% of the world's population. In 2009, AIDS claimed an estimated 1.8 million lives, down from a global peak of 2.1 million in 2004. Approximately 260,000 children died of AIDS in 2009. A disproportionate number of AIDS deaths occur in Sub-Saharan Africa, retarding economic growth and exacerbating the burden of poverty. An estimated 22.5 million people (68% of the global total) live with HIV in sub-Saharan Africa, which is also home to 90% of the world's 16.6 million children orphaned by HIV. Treatment with antiretroviral drugs reduces both the mortality and the morbidity of HIV infection. Although antiretroviral medication is still not universally available, expansion of antiretroviral therapy programs since 2004 has helped to turn the tide of AIDS deaths and new infections in many parts of the world. Intensified awareness and preventive measures, as well as the natural course of the epidemic, have also played a role. Nevertheless, an estimated 2.6 million people were newly infected in 2009.
HIV infects vital cells in the human immune system such as helper T cells (specifically CD4+ T cells), macrophages, and dendritic cells. HIV infection leads to low levels of CD4+ T cells through three main mechanisms: First, direct viral killing of infected cells; second, increased rates of apoptosis in infected cells; and third, killing of infected CD4+ T cells by CD8 cytotoxic lymphocytes that recognize infected cells. When CD4+ T cell numbers decline below a critical level, cell-mediated immunity is lost, and the body becomes progressively more susceptible to opportunistic infections.
Most untreated people infected with HIV-1 eventually develop AIDS. These individuals mostly die from opportunistic infections or malignancies associated with the progressive failure of the immune system. HIV progresses to AIDS at a variable rate affected by viral, host, and environmental factors; most will progress to AIDS within 10 years of HIV infection: some will have progressed much sooner, and some will take much longer. Treatment with anti-retrovirals increases the life expectancy of people infected with HIV. Even after HIV has progressed to diagnosable AIDS, the average survival time with antiretroviral therapy was estimated to be more than 5 years as of 2005[update]. Without antiretroviral therapy, someone who has AIDS typically dies within a year.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
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