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Doctor insights on: Antigen

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Antigen (Overview)

Antigens are chemicals which upon exposure to the surface or inside of the body, will cause a reaction term allergic. Many substances will do this and allergic response is the basis for immunological protection for defense against invading organisms.


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What are antigens?

What are antigens?

Antigens are...: An antigen is any substance that causes your immune system to produce antibodies against it. It may be a foreign substance from the environment such as bacteria, viruses, pollen or chemicals. An antigen may also be formed within the body, as with bacterial toxins. ...Read more

Antigen (Overview)

Antigens are chemicals which upon exposure to the surface or inside of the body, will cause a reaction term allergic. Many substances will do this and allergic response is the basis for immunological protection for defense against invading organisms.


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What is the definition or description of: antigen?

What is the definition or description of: antigen?

Immunoloigic chemica: Antigens are chemicals which upon exposure to the surface or inside of the body, will cause a reaction term allergic. Many substances will do this and allergic response is the basis for immunological protection for defense against invading organisms. ...Read more

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Which cells are required to process antigens from foreign materials?

Which cells are required to process antigens from foreign materials?

Dendritic macrophage: There are reliable textbooks and websites where you can read about these fascinating players in the wonderful and still-puzzling immune system. ...Read more

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Are viruses antigens?

Are viruses antigens?

No: Infectious agent with nuclei acid molecule in a protein coat which has different antigens

Antigen is a protein, toxin, or foreign substance that induces an immune response in the body like production of antibodies (humoral immunity) ...Read more

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Are antigens and t-cells related?

Yes and no: T cells are a particular type of cell of the specific immune system. T cells can be activated by specific antigens through their t cell receptors. An antigen is a particle with that is recognized by the immune system (b cells, antibodies, t cells, etc.). ...Read more

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Triple antigen prevents which diseases?

Depends: This terminology is used more outside the US and means the combination vaccine against diptheria, tetanus and whooping cough (pertussis), given in a series of scheduled doses, followed by boosters. There is a triple antigen Hepatitis B vaccine (Hepacare) but this is not used in the US. I don't know which countries offer it or even if it is still being offered. ...Read more

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What is meant by the australian antigen is positive?

HBsAg: It's an old term for the hepatitis b surface antigen. Having a positive hbsag means that you have hepatitis b: either acute or chronic. ...Read more

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What makes food particles antigens in the human body?

Food antigens: Antigens are substances, typically proteins, that are recognized by the immune system as foreign to the body. Typically, protective antibodies (igg, IgM or iga) are made to foreign proteins however, some times allergic antibodies (ige) are created. Not all persons have the genetic predisposition to make ige but about 1/3rd of the population is prone to this problem. ...Read more

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What's the difference between a superantigen and an antigen?

Super vs mere mortal: A superantigen does not require processing by a middle-man to induce an immune response. Staph enterotoxin is just one of the examples. The regular antigen requires processing and presentation to the lymphocyte in order to induce the immune response. This is just a simple answer to a complex question. ...Read more

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What is a super antigen effect? What is the health implication?

Superantigen: Too broad of a topic, see Wikipedia article on super antigens ...Read more

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What is an antigen? How effective is it in individualizing blood?

An "ID tag": An antigen is a protein of specific shape that can serve to mark or help identify a cell / virus / protein / etc., to the immune system of the body (its white blood cells). The major ones on red blood cells or in vaccines for that matter, are very effective at triggering the body's immune system to attack the foreign object. In blood, a/b/"o" and rh-factor are the main ones + about 2 dozen lesser. ...Read more

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Is a 2.9 mL Carcinoembryinic Antigen level normal for a non-smoker?

Is a 2.9 mL Carcinoembryinic Antigen level normal for a non-smoker?

No: The average level of CEA in nonsmokers is 1.9 ng/ml. However that is and average. Do you know what the range is for the lab that did your blood? ...Read more

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What is a superantigen? What's the difference between that and a regular antigen?

What is a superantigen? What's the difference between that and a regular antigen?

The N.I.H. says...: Bacterial superantigens are protein toxins that bind to major histocompatibility complex class II and T-cell receptors to stimulate large numbers of T-cells. The majority of superantigens are made by the bacteria Staph aureus and Strep pyogenes, and are the causative agents in toxic shock syndrome, an acute disease caused by the sudden and massive release of T-cell cytokines into the bloodstream. ...Read more

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I read that you have millions of B cells. How does one B cell find the right specific antigen it fits to if there's so many of them?

Antigens get held...: Each B cell recognizes only 1 unique antigen. We need > 1 million B cells to ensure most antigens are recognized. Collectively, B cells could likely recognize any organic molecule that could exist. The process does not rely on random encounters. Specialized cells trap and hold antigens where circulating B cells get the chance to recognize them. ...Read more

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55th day CMIA duo result non reactive (0.08).When do the P24 antigens disappear. How reliable is result @ 55 days PE? Further testing required?

100% conclusive: The test is 100% conclusive any time 4 weeks or more after exposure, and remains positive for life after that. It is the HIV antibody clears p24 antigen from the blood. If p24 is absent in an infected person, the antibody part of the test always is positive. Your 55 day result is conclusive. Do not have any more tests. ...Read more

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What are some HIV antigens?

Viral load?: A high level of viral antigen in the blood? There's good correlation between viral load ; progression of HIV to aids. A viral load (number of viral particles per ml of blood) 30, 000 copies means that the disease will progress rapidly. By treating with haart ; suppressing to undetectable virus we halt ds progrn. ...Read more

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Is pencillin a hapten instead of a antigen?

Is pencillin a hapten instead of a antigen?

Read: Penicillin is a chemical compound which has areas on its molecule which are haptenic. The drug itself is considered an antigen. Altering the molecule to create derivatives seldom alters the haptenic component. ...Read more

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In pregnancy, what is an m antigen?

"m" antigens: The human body produces particles called antibodies, and these are called either "G" or "M" depending on whether they are in response to old infectious agents called "antigens" or new ones respectively. These antibodies are detectible in the bloodstream and protect against certain illnesses caused by antigens (bacteria, virus or fungal). In pregnancy it is important to ensure immunity. ...Read more

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What is Antigen-specific immunotherapy?

Specific allergens: If you are referring to allergy treatment, then this simply means that you are given extracts containing the specific allergens you are sensitized to. On the other hand, allergic people are usually less likely to have autoimmune diseases like rheumatoid arthritis which you appear to suffer. Thus you will need to tell us what disease condition this treatment is intended for. ...Read more

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What is hepatitis b surface antigen in general?

What is hepatitis b surface antigen in general?

Infection is active: If you are surface antigen postive = protein on the surface of the virus is in its active form which is still floating in your blood and indicates active/on going infectious state. This protein triggers body to produce antibody which can help rid off the infection or preventing it as in case of hepb vaccines. In your case, no antibody or not enough to rid of the antigen. Consult doc. Good luck. ...Read more

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Hepatitis b surface antigen non-reactive means what?

Hepatitis b surface antigen non-reactive means what?

No active infection: When people have reactive hepatitis b surface antigen, they have proteins from hepatitis b in their blood. These people have active infection and may need treatment. If there is no reactive hbsag, then most likely there is no active infection. Rarely, people who have hepatitis b core antibody detected, but no hepatitis b surface antibody, can have chronic active infection. ...Read more

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Help please? What is the hepatitis b surface antigen?

Hepatitis B: If you have a positive hepatitis B surface antigen, then you have active hepatitis B infection. You can see a hepatologist (liver doctor) to check some other labs in order to determine if you need to be on treatment with oral medications or if a liver biopsy should be considered based on other laboratory results. Having hepatitis B can be controlled with medications. ...Read more

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What is the difference between an antibody vs an antigen?

What is the difference between an antibody vs an antigen?

Good guy vs bad guy: Antigen (the bad guy) is a foreign material that "invades" the body and the atibody (the good guy) is what the immune systen produces to nuetralize the intruder. ...Read more

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Wondering if hepatitis b e antigen reactive can be cured?

Yes and no: It's possible to convert from e antigen (hbeag) to e antibody (hbeab) with treatment of hepatitis b. This is a good thing, as it means your hepatitis is less active and you are less infectious to others. However, hepatitis b itself is not considered to be 'curable, ' and conversions from surface antigen (hbsag) to surface antibody (hbsab) rarely happen. ...Read more

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How much time to develop antibodies after exposure to Rh antigen d?

How much time to develop antibodies after exposure to Rh antigen d?

Varies: Most people will make detectable antibodies in about two weeks after receiving rh d positive blood, if the recipient is rh d negative. ...Read more

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Can u please interpret what a-ab antigens mean and c-ab antigens mean?

Need context: Please ask this question again with more information about the name of the test and what problem you were having. ...Read more

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Can you tell me how are b-cells and antibodies presented with antigen?

Can you tell me how are b-cells and antibodies presented with antigen?

Form hybridoma: When an antigen is given to an animal, B cells in serum produce a polyvalent antibody prep. When antigen is given to an animal and spleen cells (B) are fused with malignant B cells, a hybrid clone is formed producing monoclonal antibodies to the specific protein antigen. ...Read more

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