Hiv immunity essay

Sebaceous glands secret lactic acid and fatty acids. Mucous can be sticky and trap pathogens.

Hiv immunity essay

Administering diphtheria antitoxin derived from horse serum, The Historical Medical Library of The College of Physicians of Philadelphia This article assumes familiarity with the terms antibody, antigen, immunity, and pathogen.

See the Glossary for definitions. A person may become immune to a specific disease in several ways. For some illnesses, such as measles and chickenpox, having the disease usually leads to lifelong immunity to it. Vaccination is another way to become immune to a disease.

Both ways of gaining immunity, either from having an illness or from vaccination, are examples of active immunity. If the person encounters that pathogen again, Hiv immunity essay immune cells specific to it will already be primed to Hiv immunity essay it.

The protection offered by passive immunization is short-lived, usually lasting only a few weeks or months. But it helps protect right away. Breast milk, though not as rich in protective components as colostrum, also contains antibodies that pass to the nursing infant.

This protection provided by the mother, however, is short-lived.

Hiv immunity essay

During the first few months of life, maternal antibody levels in the infant fall, and protection fades by about six months of age. These antibodies may come from the pooled and purified blood products of immune people or from non-human immune animals, such as horses.

In fact, the earliest antibody-containing preparations used against infectious diseases came from horses, sheep, and rabbits. The History of Passive Immunization Antibodies were first used to treat disease in the late 19th century as the field of bacteriology was emerging.

The first success story involved diphtheria, a dangerous disease that obstructs the throat and airway of those who contract it. InShibasaburo Kitasato and Emil von Behring immunized guinea pigs against diphtheria with heat-treated blood products from animals that had recovered from the disease.

The preparations contained antibodies to the diphtheria toxin that protected the guinea pigs if they were exposed soon thereafter to lethal doses of diphtheria bacteria and its toxin.

Next, the scientists showed that they could cure diphtheria in an animal by injecting it with the blood products of an immunized animal. They soon moved to testing the approach on humans and were able to show that blood products from immunized animals could treat diphtheria in humans. The antibody-containing blood-derived substance was called diphtheria antitoxin, and public boards of health and commercial enterprises began producing and distributing it from onward.

Humoral and Cell-Mediated Immune Responses

Kitasato, von Behring, and other scientists then devoted their attention to treatment of tetanus, smallpox, and bubonic plague with antibody-containing blood products. The use of antibodies to treat specific diseases led to attempts to develop immunizations against the diseases.

Their pioneering work, along with advances in the separation of the antibody-containing blood component, led to many studies on the effectiveness of antibody preparations for immunization against measles and infectious hepatitis. Before the polio vaccine was licensed, health officials had hopes for the use of gamma globulin an antibody-containing blood product to prevent the disease.

He showed that administration of gamma globulin containing known poliovirus antibodies could prevent cases of paralytic polio.

However, the limited availability of gamma globulin, and the short-term protection it offered, meant that the treatment could not be used on a wide scale. The licensure of the inactivated Salk polio vaccine in made reliance on gamma globulin for poliovirus immunization unnecessary.

Passive Immunization Today Today, patients may be treated with antibodies when they are ill with diphtheria or cytomegalovirus. Or, antibody treatment may be used as a preventive measure after exposure to a pathogen to try to stop illness from developing such as with respiratory syncytial virus [RSV], measles, tetanus, hepatitis A, hepatitis B, rabies, or chickenpox.

Humoral and Cell-Mediated Immune Responses

Antibody treatment may not be used for routine cases of these diseases, but it may be beneficial to high-risk individuals, such as people with immune system deficiencies. Advantages and Disadvantages of Passive Immunization Vaccines typically need time weeks or months to produce protective immunity in an individual and may require several doses over a certain period of time to achieve optimum protection.

Passive immunization, however, has an advantage in that it is quick acting, producing an immune response within hours or days, faster than a vaccine. Additionally, passive immunization can override a deficient immune system, which is especially helpful in someone who does not respond to immunization.

Antibodies, however, have certain disadvantages. First, antibodies can be difficult and costly to produce.

Department of Microbiology & Immunology

Although new techniques can help produce antibodies in the laboratory, in most cases antibodies to infectious diseases must be harvested from the blood of hundreds or thousands of human donors.

Or, they must be obtained from the blood of immune animals as with antibodies that neutralize snake venoms. In the case of antibodies harvested from animals, serious allergic reactions can develop in the recipient.

Another disadvantage is that many antibody treatments must be given via intravenous injection, which is a more time-consuming and potentially complicated procedure than the injection of a vaccine. Finally, the immunity conferred by passive immunization is short lived: In certain cases, passive and active immunity may be used together.Mark Connors, M.D., chief of the HIV-Specific Immunity Section in NIAID’s Laboratory of Immunoregulation and the senior author of the paper, also is available.

The research team included scientists from NIAID’s Laboratory of Immunoregulation and Vaccine Research Center. What is HIV/AIDS? HIV (Human Immunodeficiency Virus) is a virus that causes AIDS (Acquired Immunodeficiency Syndrome).

A person may be “HIV positive” but not have AIDS. An HIV infected person may not develop AIDS for 10 years or longer. Humoral and Cell-Mediated Immune Responses.

The immune system distinguishes two groups of foreign substances. One group consists of antigens that are freely circulating in the body. These include molecules, viruses, and foreign cells.

A second group consists of self cells that display aberrant MHC proteins. Memory cells provide future immunity. During HIV infection, CD4 T cells in lymphoid tissues initiate a highly inflammatory form of cell death that helps cripple the immune system.

During HIV infection, CD4 T cells in lymphoid tissues initiate a highly inflammatory form of cell death that helps cripple the immune system.

Hiv immunity essay

Human immunodeficiency virus (HIV) is the virus that causes AIDS. When a person becomes infected with HIV, the virus attacks and weakens the immune system. As the immune system weakens, the person is at risk of getting life-threatening infections and cancers.

HIV is a virus. It attacks the body's CD4 cells, a type of white blood cell that helps protect the body from infection. In this way, it weakens the body's defenses against infection and illness.

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