immunity

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immunity

 [ĭ-mu´nĭ-te]
the condition of being immune; the protection against infectious disease conferred either by the immune response generated by immunization or previous infection or by other nonimmunologic factors. It encompasses the capacity to distinguish foreign material from self, and to neutralize, eliminate, or metabolize that which is foreign (nonself) by the physiologic mechanisms of the immune response.

The mechanisms of immunity are essentially concerned with the body's ability to recognize and dispose of substances which it interprets as foreign and harmful to its well-being. When such a substance enters the body, complex chemical and mechanical activities are set into motion to defend and protect the body's cells and tissues. The foreign substance, usually a protein, is called an antigen, that is, one that generates the production of an antagonist. The most common response to the antigen is the production of antibody. The antigen--antibody reaction is an essential component of the overall immune response. A second type of activity, cellular response, is also an essential component.

The various and complex mechanisms of immunity are basic to the body's ability to protect itself against specific infectious agents and parasites, to accept or reject cells and tissues from other individuals, as in blood transfusions and organ transplants, and to protect against cancer, as when the immune system recognizes malignant cells as not-self and destroys them.

There has been extensive research into the body's ability to differentiate between cells, organisms, and other substances that are self (not alien to the body), and those that are nonself and therefore must be eliminated. A major motivating force behind these research efforts has been the need for more information about growth and proliferation of malignant cells, the inability of certain individuals to develop normal immunological responses (as in immunodeficiency conditions), and mechanisms of failure of the body to recognize its own tissues (as in autoimmune diseases).
Immunological Responses. Immunological responses in humans can be divided into two broad categories: humoral immunity, which takes place in the body fluids (humors) and is concerned with antibody and complement activities; and cell-mediated or cellular immunity, which involves a variety of activities designed to destroy or at least contain cells that are recognized by the body as alien and harmful. Both types of responses are instigated by lymphocytes that originate in the bone marrow as stem cells and later are converted into mature cells having specific properties and functions.

The two kinds of lymphocytes that are important to establishment of immunity are T lymphocytes (T cells) and B lymphocytes (B cells). (See under lymphocyte.) The T lymphocytes differentiate in the thymus and are therefore called thymus-dependent. There are several types involved in cell-mediated immunity, delayed hypersensitivity, production of lymphokines, and the regulation of the immune response of other T and B cells.

The B lymphocytes are so named because they were first identified during research studies involving the immunologic activity of the bursa of Fabricius, a lymphoid organ in the chicken. (Humans have no analogous organ.) They mature into plasma cells that are primarily responsible for forming antibodies, thereby providing humoral immunity.
Humoral Immunity. At the time a substance enters the body and is interpreted as foreign, antibodies are released from plasma cells and enter the body fluids where they can react with the specific antigens for which they were formed. This release of antibodies is stimulated by antigen-specific groups (clones) of B lymphocytes. Each B lymphocyte has IgM immunoglobulin receptors that play a major role in capturing its specific antigen and in launching production of the immunoglobulins (which are antibodies) that are capable of neutralizing and destroying that particular type of antigen.

Most of the B lymphocytes activated by the presence of their specific antigen become plasma cells, which then synthesize and export antibodies. The activated B lymphocytes that do not become plasma cells continue to reside as “memory” cells in the lymphoid tissue, where they stand ready for future encounters with antigens that may enter the body. It is these memory cells that provide continued immunity after initial exposure to the antigens.

There are two types of humoral immune response: primary and secondary. The primary response begins immediately after the initial contact with an antigen; the resulting antibody appears 48 to 72 hours later. The antibodies produced during this primary response are predominantly of the IgM class of immunoglobulins.

A secondary response occurs within 24 to 48 hours. This reaction produces large quantities of immunoglobulins that are predominantly of the IgG class. The secondary response persists much longer than the primary response and is the result of repeated contact with the antigens. This phenomenon is the basic principle underlying consecutive immunizations.

The ability of the antibody to bind with or “stick to” antigen renders it capable of destroying the antigen in a number of ways; for example, agglutination and opsonization. Antibody also “fixes” or activates complement, which is the second component of the humoral immune system. Complement is the name given a complex series of enzymatic proteins which are present but inactive in normal serum. When complement fixation takes place, the antigen, antibody, and complement become bound together. The cell membrane of the antigen (which usually is a bacterial cell) then ruptures, resulting in dissolution of the antigen cell and a leakage of its substance into the body fluids. This destructive process is called lysis.
Cellular Immunity. This type of immune response is dependent upon T lymphocytes, which are primarily concerned with a delayed type of immune response. Examples of this include rejection of transplanted organs, defense against slowly developing bacterial diseases that result from intracellular infections, delayed hypersensitivity reactions, certain autoimmune diseases, some allergic reactions, and recognition and rejection of self cells undergoing alteration, for example, those infected with viruses, and cancer cells that have tumor-specific antigens on their surfaces. These responses are called cell-mediated immune responses.

The T lymphocyte becomes sensitized by its first contact with a specific antigen. Subsequent exposure to the antigen stimulates a host of chemical and mechanical activities, all designed to either destroy or inactivate the offending antigen. Some of the sensitized T lymphocytes combine with the antigen to deactivate it, while others set about to destroy the invading organism by direct invasion or the release of chemical factors. These chemical factors, through their influence on macrophages and unsensitized lymphocytes, enhance the effectiveness of the immune response.

Among the more active chemical factors are lymphokines, which are potent and biologically active proteins; their names are often descriptive of their functions: Ones that directly affect the macrophages are the macrophage chemotactic factor, which attracts macrophages to the invasion site; migration inhibitory factor, which causes macrophages to remain at the invasion site; and macrophage-activating factor, which stimulates the metabolic activities of these large cells and thereby improves their ability to ingest the foreign invaders.

Another factor, a protein called interferon, is produced by the body cells, especially T lymphocytes, following viral infection or in response to a wide variety of inducers, such as certain nonviral infectious agents and synthetic polymers.

A portion of the population of T lymphocytes is transformed into killer cells by the lymphocyte-transforming factor (blastogenic factor). These activated lymphocytes produce a lymphotoxin or cytotoxin that damages the cell membranes of the antigens, causing them to rupture.

In order to ensure an ample supply of T lymphocytes, two factors are at work: lymphocyte-transforming factor stimulates lymphocytes that have already undergone conversion to sensitized T lymphocytes, so that they increase their numbers by repeated cell division and clone formation; in the absence of antigens, transfer factor takes over the task of sensitizing those lymphocytes that have not been exposed to antigen.

It is apparent that the immune response brings about intensive activity at the site of invasion; it is not only the pathogen that is destroyed, but invariably, there is death or damage to some normal tissues.
Interactions Between the Two Systems. There are several areas in which the cellular and humoral systems interact and thereby improve the efficiency of the overall immune response. For example, a by-product of the enzymatic activity of the complement system acts as a chemotactic factor, attracting T lymphocytes and macrophages to the invasion site. In another example, although T lymphocytes are not required for the production of antibody, there is optimal antibody production after interaction between T and B lymphocytes.

For a discussion of abnormalities of the immune response system, see immune response.
Types of Immunity. An individual may be naturally immune to certain pathological conditions or may acquire immunity through either active or passive means.
Natural immunity is a genetic characteristic of an individual and is due to the particular species and race to which one belongs, to one's sex, and to one's individual ability to produce immune bodies. All humans are immune to certain diseases that affect animals of the lower species; males are more resistant to some disorders than are females, and vice versa. Persons of one race are more susceptible to some diseases than those of another race that has had exposure to the infectious agents through successive generations. One's individual ability to produce immune bodies, and thereby ward off pathogens, is influenced by one's state of physical health, one's nutritional status, and one's emotional response to stress.

In order for an individual to acquire immunity one's body must be stimulated to produce its own immune response components (active immunity) or these substances must be produced by other persons or animals and then passed on to the person (passive immunity). Active immunity can be established in two ways: by having the disease or by receiving modified pathogens and toxins. When an individual is exposed to a disease and the pathogenic organisms enter the body, the production of antibody is initiated. After recovery from the illness, memory cells remain in the body and stand ready as a defense against future invasion. It is possible, through the use of vaccines, bacterins, and modified toxins (toxoids), to stimulate the production of specific antibodies without having an attack of the disease. These are artificial means by which an individual can acquire active immunity.

Sometimes it is desirable to provide “ready-made” immune bodies, as in cases in which the patient has already been exposed to the antigen, is experiencing the symptoms of the disease, and needs reinforcements to help mitigate its harmful effects. Examples of conditions for which an individual may be given such passive immunity include tetanus, diphtheria, and a venomous snake bite. The patient is given immune serum, which contains gamma globulin, antibodies (including antitoxin) produced by the animal from which the serum was taken.

It is not always necessary that the patient actually suffer from the disease and exhibit its symptoms before passive immunity is provided. In some instances in which exposure to an infectious agent is suspected, immune bodies may be given to ward off a full-blown attack or at least to lessen its severity.

Another way in which immunity can be passively acquired is across the placental barrier from fetus to mother. The maternal antibody thus acquired serves as protection for the newborn until he can actively establish immunity on his own. Although humoral immunity can be acquired in this way, cellular immunity cannot.
Cell-mediated immunity. From Applegate, 2000.
acquired immunity specific immunity attributable to the presence of antibody and to a heightened reactivity of antibody-forming cells, specifically immune lymphoid cells (responsible for cell-mediated immunity), and of phagocytic cells, following prior exposure to an infectious agent or its antigens, or passive transfer of antibody or immune lymphoid cells (adoptive immunity).
adoptive immunity passive immunity of the cell-mediated type conferred by the administration of sensitized lymphocytes from an immune donor.
artificial immunity acquired (active or passive) immunity produced by deliberate exposure to an antigen, such as a vaccine.

im·mu·ni·ty

(i-myū'ni-tē),
1. The status or quality of being immune (1).
2. Protection against infectious disease.
Synonym(s): insusceptibility
[L. immunitas (see immune)]

immunity

/im·mu·ni·ty/ (ĭ-mu´nĭ-te) the condition of being immune; the protection against infectious disease conferred either by the immune response generated by immunization or previous infection or by other nonimmunologic factors.
acquired immunity  that occurring as a result of prior exposure to an infectious agent or its antigens (active i.), or of passive transfer of antibody or immune lymphoid cells (passive i.) .
active immunity  see acquired i.
artificial immunity  acquired (active or passive) immunity produced by deliberate exposure to an antigen, as in vaccination.
cell-mediated immunity  (CMI), cellular immunity acquired immunity in which the role of T lymphocytes is predominant.
genetic immunity  innate i.
herd immunity  the resistance of a group to attack by a disease to which a large proportion of the members are immune.
humoral immunity  acquired immunity in which the role of circulating antibodies is predominant.
inherent immunity , innate immunity that determined by the genetic constitution of the individual.
maternal immunity  humoral immunity passively transferred across the placenta from mother to fetus.
natural immunity  the resistance of the normal animal to infection.
nonspecific immunity  that which does not involve humoral or cell-mediated immunity, but includes lysozyme and interferon activity, etc.
passive immunity  see acquired i.
specific immunity  immunity against a particular disease or antigen.

immunity

(ĭ-myo͞o′nĭ-tē)
n. pl. immuni·ties
Immunology Inherited, acquired, or induced resistance to infection by a specific pathogen.

immunity

[imyo̅o̅′nitē]
Etymology: L, immunis, free from
1 (in civil law) exemption from a duty or an obligation generally required by law, as an exemption from taxation or from penalty for wrongdoing or protection against liability.
2 the quality of being insusceptible to or unaffected by a particular disease or condition. Kinds of immunity are acquired immunity, active immunity, and passive immunity. immune, adj.

immunity

1. A state in which a host is not susceptible to infection or disease.
2. The mechanisms by which this is achieved. Immunity is achieved by an individual through one of three routes: natural or innate immunity genetically inherited or acquired through maternal antibody, acquired immunity conferred after contact with a disease, and artificial immunity after a successful vaccination Also termed specific immunity, resistance or specific resistance, specific immunity is divided into cellular immunity, acting via the direct involvement of T cells and humoral immunity involving antibodies and B cells. See Acquired immunity, Active immunity, Adoptive immunity, Allograft immunity, Cell-mediated immunity, Herd immunity, Maternal immunity, Mucosal immunity, Natural immunity, Passive immunity, Sterilizing immunity, Superinfection immunity.

im·mu·ni·ty

(i-myū'ni-tē)
The status or quality of being immune (1).
Synonym(s): insusceptibility.
[L. immunitas]

immunity

(im-u'nit-e) [L. immunitas, exemption]
Protection from diseases, esp. from infectious diseases. See: immune response; immune system; immunization; vaccine

acquired immunity

Immunity owing to exposure to an antigen or to the passive injection of immunoglobulins.

active immunity

Immunity resulting from the development within the body of antibodies or sensitized T lymphocytes that neutralize or destroy the infective agent. This may result from the immune response to an invading organism or from inoculation with a vaccine containing a foreign antigen.
See: immune response; vaccination

adaptive immunity

The component of immunity that is pathogen-specific and creates memory. It consists of the mechanisms of cell-mediated and antibody-mediated immunity.
See: innate immunity

B-cell–mediated immunity

Humoral immunity.
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CELL-MEDIATED IMMUNITY

cell-mediated immunity

Abbreviation: CMI.
The regulatory and cytotoxic activities of T cells during the specific immune response. This process requires about 36 hr to reach its full effect. Synonym: T-cell–mediated immunity See: illustration; humoral immunity

Unlike B cells, T cells cannot recognize foreign antigens on their own. Foreign antigens are recognized by antigen-presenting cells (APCs) such as macrophages, which engulf them and display part of the antigens on the APC's surface next to a histocompatibility or “self-” antigen (macrophage processing). The presence of these two markers, plus the cytokine interleukin-1 (IL-1) secreted by the APCs activates CD4 helper T cells (TH cells), which regulate the activities of other cells involved in the immune response.

CMI includes direct lysis of target cells by cytotoxic T cells, creation of memory cells that trigger a rapid response when a foreign antigen is encountered for the second time, and delayed hypersensitivity to tissue and organ transplants. T cells also stimulate the activity of macrophages, B cells, and natural killer cells. These functions are controlled largely by the secretion of lymphokines such as the interleukins, interferons, and colony-stimulating factors. Lymphokines facilitate communication and proliferation of the cells in the immune system.

cellular immunity

T-cell–mediated immune functions requiring cell interactions, e.g., graft rejection or destruction of infected cells.
See: cellular immunity

cocoon immunity

Vaccination of all the household contacts of an infant against those infectious diseases that he or she might contract. It is designed to protect disease-naive newborns from potentially fatal contagious illnesses. Synonym: cocoon strategy.

community immunity

Herd immunity.

congenital immunity

Immunity present at birth. It may be natural or acquired, the latter depending on antibodies received from the mother's blood.

herd immunity

The ability of a community to resist epidemic disease. Herd immunity may develop naturally in a society as a result of widespread exposure to disease, or it may be stimulated artificially by mass vaccination programs.

Patient care

Members of every region or community should be alerted to local or widespread communicable diseases for which vaccination is available. Offering public immunization sessions through local health departments, schools, colleges and places of business, as well as public and private health care agencies will increase the percentage of persons who are vaccinated and will decrease risk of communicable disease epidemics.

Synonym: community immunity
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HUMORAL IMMUNITY

humoral immunity

The protective activities of antibodies against infection or reinfection by common organisms, e.g., streptococci and staphylococci. B lymphocytes with receptors to a specific antigen react when they encounter that antigen by producing plasma cells (which produce antigen-specific antibodies) and memory cells (which enable the body to produce these antibodies quickly in the event that the same antigen appears later). B-cell differentiation also is stimulated by interleukin-2 (IL-2) secreted by CD4+ T cells and foreign antigens processed by macrophages.

Antibodies produced by plasma B cells, found mainly in the blood, spleen, and lymph nodes, neutralize or destroy antigens in several ways. They kill organisms by activating the complement system; neutralize viruses and toxins released by bacteria; coat the antigen (opsonization) or form an antigen-antibody complex to stimulate phagocytosis; promote antigen clumping (agglutination); and prevent the antigen from adhering to host cells.

Synonym: B-cell–mediated immunity See: illustration; cell-mediated immunity; immunoglobulin

innate immunity

Those immune defenses against infection and cancer that are not determined by the specific responses of B or T lymphocytes. Innate immunity is not pathogen-specific and does not create immunological memory. It includes the actions of adhesion molecules; cellular chemotaxis; the secretion of cytokines; cytotoxicity; the activities of dendritic and natural killer cells; inflammation; and phagocytosis. Synonym: innate immune system

local immunity

Immunity limited to a given area or tissue of the body.

natural immunity

Immunity that is genetically determined in specific species, populations, or families. Some pathogens cannot infect certain species because the cells do not provide suitable environments. For example, the measles virus cannot reproduce in canine cells and therefore dogs have natural immunity to measles.

passive immunity

Immunity acquired by the introduction of preformed antibodies into an unprotected individual. This can occur through intravenous infusion of immune globulin or from antibodies that pass from the mother to the fetus through the placenta in utero. Newborns also may acquire immunity through breastfeeding.

T-cell–mediated immunity

Cell-mediated immunity.

waning immunity

The progressive loss of protective antibodies against an antigen or disease that occurs with the passage of time. It is a crucial factor in vaccination. Booster doses of a vaccine are given when the immune response to an antigen drops below protective levels.

immunity

The relative ability to resist infection or the effects of any toxic or dangerous substance. Immunity may be inherent or acquired as a result of prior infection or immunization. Active immunity involves the production of ANTIBODIES. Passive immunity is that conferred by antibodies derived from another person or animal and injected or received across the placenta or in the breast milk. Passive immunity is much less persistent than active immunity.

immunity

resistance to foreign ANTIGENS such as a virus. Immunity can be either active, in which the body produces its own IMMUNE RESPONSE after exposure to a pathogen or a vaccine, or passive in which ready-made antibodies are supplied in a serum (or obtained naturally from the mother).

immunity

the protected condition provided by the immune system or by medical interventions. natural (innate) immunity includes (1) protective barriers - skin and mucous membranes, and their antibacterial secretions; (2) humoral defences - substances in the body fluids, produced or activated when micro-organisms invade, and promoting the function of (3) phagocytic cells - white blood cells and macrophages. acquired immunity (1) active: the result of specific defence mechanisms, each initiated by exposure to a particular antigen and effective against subsequent exposures; includes deliberate immunization by injection of a harmless dose of organisms (alive or dead) or their toxins; (2) passive: for urgent treatment (e.g. of tetanus infection or snake bite) transfer of serum or cells from an already immune individual See also lymphatic system.

immunity

disease resistance

im·mu·ni·ty

(i-myū'ni-tē)
Status or quality of being immune.
[L. immunitas]

immunity (imū´nitē),

n 1. an exemption from service or from duties that the law ordinarily requires most citizens to perform (e.g., jury duty).
2. the condition of an organism whereby it successfully resists or is not susceptible to injury or infection. See also memory.
immunity, acquired,
n 1. the resistance to a particular disease (e.g., chickenpox) after recovering from that disease.
2. the resistance to poisons or medications developed over a usually long period of gradually increasing exposure.
immunity, active,
n the resistance to a disease or other biological or chemical agents acquired naturally as a result of exposure to the disease or agent; can also be acquired artificially by use of a vaccine containing a weakened or deadened form of the agent, stimulating the immune system to produce antibodies long after the initial exposure. See also passive immunity.
immunity, natural,
n the inherited ability to remain resistant to or unaffected by a specific disease.
immunity, passive,
n the short-term resistance to a specific disease that has been acquired either through the placenta from mother to fetus or as the result of receiving an injection of serum antibodies (gamma globulins) taken from an immune person or animal (inoculation). See also immunity, active and gamma globulins.

immunity

1. the condition of being immune; security against a particular disease; nonsusceptibility to the invasive or pathogenic effects of microorganisms or helminth parasites or to the toxic effect of antigenic substances. Called also functional or protective immunity.
2. responsiveness to antigen that leads to more rapid binding or elimination of antigen than in the nonimmune state; it includes both humoral and cell-mediated immunity (below).
3. the capacity to distinguish foreign material from self, and to neutralize, eliminate or metabolize that which is foreign (non-self) by the physiological mechanisms of the immune response.
The mechanisms of immunity are essentially concerned with the body's ability to recognize and dispose of substances which it interprets as foreign and sometimes harmful to its well-being. When such a substance enters the body, complex chemical and mechanical activities are set into motion to defend and protect the body's cells and tissues. The foreign substance, usually a protein, is called an antigen, that is, one which generates the production of an antagonist. The most readily recognized response to the antigen is the production of antibody. The antigen-antibody reaction is an essential component of the overall immune response. Of equal or greater importance to antibody, particularly for some antigens, is the development of so-called cell-mediated immune response, which involves clonal expansion of specifically reactive T lymphocytes including cytotoxic T lymphocytes (Tc lymphocytes) which play a major role in eliminating the foreign antigens that are cell associated.
Immunological responses in animals can be divided into two broad categories: humoral immunity, which refers to the production of antibody which becomes part of the body fluids (humors), especially serum, and cell-mediated or cellular immunity, which involves a variety of activities designed to destroy or at least contain cells that are recognized by the body as expressing foreign antigens on their cell surface, e.g. viral antigens. Both types of response are mediated by lymphocytes that originate in the bone marrow as stem cells and later are converted into mature cells having specific properties and functions.

acquired immunity
antigen specific immunity attributable to the production of antibody and of specific immune T lymphocytes (responsible for cell-mediated immunity), following exposure to an antigen, or passive transfer of antibody or immune lymphoid cells (adoptive immunity).
active immunity
that which follows exposure to an antigen; acquired immunity attributable to the presence of antibody or of immune lymphoid cells formed in response to antigenic stimulus. Called also adaptive immunity.
adoptive immunity
passive immunity of the cell-mediated type conferred by the administration of sensitized lymphocytes from an immune donor to a naive recipient.
artificial immunity
includes acquired (active) immunity produced by deliberate exposure to an antigen, such as a vaccine or the administration of antibody (passive).
cellular immunity
dependent upon T lymphocytes which are sensitized by first exposure to a specific antigen. Subsequent exposure stimulates the release of a group of substances known as lymphokines, such as interferon, and interleukins as well as direct killing by cytotoxic T lymphocytes.
functional immunity
see immunity (above).
humoral immunity
mediated by antibodies formed by antigen-specific B lymphocytes. Each B lymphocyte has monomeric IgM receptors which capture specific antigen, initiating production of the specific immunoglobulins. B lymphocytes activated by the presence of their specific antigen undergo transformation, lymphocyte blastogenesis, whereby they become metabolically active, divide, and some mature to plasma cells, which are major producers of antibodies. Some cells revert to small lymphocytes, 'memory' cells, and the expanded clone of these cells, on re-exposure to the antigen, undergo further lymphocyte blastogenesis, leading to further increased antibody production and numbers of memory cells.
There are two types of humoral immune response: primary and secondary. The primary response begins immediately after the inital contact with an antigen; the resulting antibody, predominantly IgM, appears 48 to 72 hours later. The secondary response occurs within 24 to 48 hours and produces large quantities of predominantly IgG. The secondary response persists much longer than the primary response and is the result of repeated contact with the antigens.
innate immunity, native immunity, natural immunity
natural immunity resulting from the genetic makeup of the host, before exposure to an antigen.
maternal immunity
that acquired by the neonate by transplacental transfer of immunoglobulins or from ingestion of colostrum or via the yolk sac in the case of birds. The placentation of all agricultural animals precludes trans-placental transfer of immunoglobulin. Passive transfer of maternal immunity is effected by the transfer of immunoglobulilns present in high concentration in the first milk, colostrum, through the intestine of the newborn. The success of this transfer is dependent upon the time after birth that colostrum is ingested (physiologically 24-36 hours, but effectively for adequate transfer, 8 hours after birth) and on the mass of immunoglobulin ingested which is determined by the concentration of immunoglobulin in colostrum and the amount of colostrum ingested.
Failure of passive transfer results in a significant increase in risk for neonatal disease. Neonates that fail to acquire serum concentrations of IgG1 greater than 10 mg/ml are at significantly higher risk of septicemic, enteric and respiratory disease. Failure of passive transfer occurs as a result of neonates sucking the dam or acquiring colostrum by artificial feeding too late in the absorptive process, or by receiving too little colostrum or receiving colostrum with low immunoglobulin concentration. See also passive immunity (below) and colostral immunoglobulin.
natural immunity
see innate immunity (above).
passive immunity
the transfer of antibodies from a donor in which they were produced to a recipient for temporary immunity. Can be in the form of serum or colostrum or yolk. Significant transplacental transfer of antibodies is found in primates, but does not occur in domestic animals. Passive immunity in domestic mammals comes via the colostrum, with its high concentration of antibodies, and the more than normally pervious epithelium of the neonate's intestinal epithelium. In birds maternal antibody is transferred to the yolk, from where the developing chick embryo absorbs it from about day 11 of incubation. See also passive immunization.
protective immunity
see immunity (above).

Patient discussion about immunity

Q. What can I do to build muscle and develop immunity? I'm Mickey, 21. My height is 5’5” and I weigh 176 lbs. I love out door games especially soccer. I have poor immunity that I get sick very often. What can I do to build muscle and develop immunity?

A. You must keep your GI tract healthy. Eat plenty of soluble and insoluble fiber every day minimum of 25 grams, but gradually shoot up to 35 grams. Include yogurt or encapsulated probiotics in your daily diet. The more robust your GI tract, the more available nutrients such as glutamine is for anabolic muscle metabolism. Another nutrient is ImmunoLin, a purified source of immunoglobin G (IgG), which fights off viruses that may enter the body through the GI tract. Research has shown that IgG not only improves get immune health, which helps you to stay healthy, but also helps people who suffer from various allergies. Do exercise regularly. If you follow the above tips, I am sure you will get the desired results.

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