Immunoglobulin therapy

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Immunoglobulin therapy
Clinical data
Trade names Flebogamma, Gammagard, Hizentra, others
Other namesnormal human immunoglobulin (HNIG), human normal immunoglobulin (HNIG)
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administration 		Intravenous, intramuscular, subcutaneous
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Immunoglobulin therapy is the use of a mixture of antibodies (normal human immunoglobulin) to treat several health conditions. [13] [14] These conditions include primary immunodeficiency, immune thrombocytopenic purpura, chronic inflammatory demyelinating polyneuropathy, Kawasaki disease, certain cases of HIV/AIDS and measles, Guillain–Barré syndrome, and certain other infections when a more specific immunoglobulin is not available. [13] Depending on the formulation it can be given by injection into muscle, a vein, or under the skin. [13] The effects last a few weeks. [14]

Contents

Common side effects include pain at the site of injection, muscle pain, and allergic reactions. [13] Other severe side effects include kidney problems, anaphylaxis, blood clots, and red blood cell breakdown. [13] Use is not recommended in people with some types of IgA deficiency. [13] Use appears to be relatively safe during pregnancy. [13] Human immunoglobulin is made from human blood plasma. [13] It contains antibodies against many viruses. [14]

Human immunoglobulin therapy first occurred in the 1930s and a formulation for injection into a vein was approved for medical use in the United States in 1981. [15] It is on the World Health Organization's List of Essential Medicines. [16] [17] Each formulation of the product is somewhat different. [14] A number of specific immunoglobulin formulations are also available including for hepatitis B, rabies, tetanus, varicella infection, and Rh positive blood exposure. [14]

Medical uses

Immunoglobulin therapy is used in a variety of conditions, many of which involve decreased or abolished antibody production capabilities, which range from a complete absence of multiple types of antibodies, to IgG subclass deficiencies (usually involving IgG2 or IgG3), to other disorders in which antibodies are within a normal quantitative range, but lacking in quality – unable to respond to antigens as they normally should – resulting in an increased rate or increased severity of infections. In these situations, immunoglobulin infusions confer passive resistance to infection on their recipients by increasing the quantity/quality of IgG they possess. Immunoglobulin therapy is also used for a number of other conditions, including in many autoimmune disorders such as dermatomyositis in an attempt to decrease the severity of symptoms. Immunoglobulin therapy is also used in some treatment protocols for secondary immunodeficiencies such as human immunodeficiency virus (HIV), some autoimmune disorders (such as immune thrombocytopenia and Kawasaki disease), some neurological diseases (multifocal motor neuropathy, stiff person syndrome, multiple sclerosis and myasthenia gravis) some acute infections and some complications of organ transplantation. [18]

Immunoglobulin therapy is especially useful in some acute infection cases such as pediatric HIV infection and is also considered the standard of treatment for some autoimmune disorders such as Guillain–Barré syndrome. [19] [20] The high demand which coupled with the difficulty of producing immunoglobulin in large quantities has resulted in increasing global shortages, usage limitations and rationing of immunoglobulin. [21]

Australia

The Australian Red Cross Blood Service developed their own guidelines for the appropriate use of immunoglobulin therapy in 1997. [22] Immunoglobulin is funded under the National Blood Supply and indications are classified as either an established or emerging therapeutic role or conditions for which immunoglobulin use is in exceptional circumstances only. [23]

Subcutaneous immunoglobulin access programs have been developed to facilitate hospital based programs. [24]

Human normal immunoglobulin (human immunoglobulin G) (Cutaquig) was approved for medical use in Australia in May 2021. [25]

Canada

The National Advisory Committee on Blood and Blood Products of Canada (NAC) and Canadian Blood Services have also developed their own separate set of guidelines for the appropriate use of immunoglobulin therapy, which strongly support the use of immunoglobulin therapy in primary immunodeficiencies and some complications of HIV, while remaining silent on the issues of sepsis, multiple sclerosis, and chronic fatigue syndrome. [26]

European Union

Brands include HyQvia (human normal immunoglobulin), Privigen (human normal immunoglobulin (IVIg)), Hizentra (human normal immunoglobulin (SCIg)), Kiovig (human normal immunoglobulin), and Flebogamma DIF (human normal immunoglobulin). [12] [27] [28] [29]

In the EU human normal immunoglobulin (SCIg) (Hizentra) is used in people whose blood does not contain enough antibodies (proteins that help the body to fight infections and other diseases), also known as immunoglobulins. [27] It is used to treat the following conditions:

It is indicated for replacement therapy in adults and children in primary immunodeficiency syndromes such as:

Flebogamma DIF is indicated for the replacement therapy in adults, children and adolescents (0–18 years) in:

and for the immunomodulation in adults, children and adolescents (0–18 years) in:

United Kingdom

The United Kingdom's National Health Service recommends the routine use of immunoglobulin for a variety of conditions including primary immunodeficiencies and a number of other conditions, but recommends against the use of immunoglobulin in sepsis (unless a specific toxin has been identified), multiple sclerosis, neonatal sepsis, and pediatric HIV/AIDS. [31]

United States

The American Academy of Allergy, Asthma, and Immunology supports the use of immunoglobulin for primary immunodeficiencies, while noting that such usage actually accounts for a minority of usage and acknowledging that immunoglobulin supplementation can be appropriately used for a number of other conditions, [32] including neonatal sepsis (citing a sixfold decrease in mortality), considered in cases of HIV (including pediatric HIV), considered as a second line treatment in relapsing-remitting multiple sclerosis, but recommending against its use in such conditions as chronic fatigue syndrome, PANDAS (pediatric autoimmune neuropsychiatric disorders associated with streptococcal infection) until further evidence to support its use is found (though noting that it may be useful in PANDAS patients with an autoimmune component), cystic fibrosis, and a number of other conditions. [18]

Brands include:

Side effects

Although immunoglobulin is frequently used for long periods of time and is generally considered safe, immunoglobulin therapy can have severe adverse effects, both localized and systemic. Subcutaneous administration of immunoglobulin is associated with a lower risk of both systemic and localized risk when compared to intravenous administration (hyaluronidase-assisted subcutaneous administration is associated with a greater frequency of adverse effects than traditional subcutaneous administration but still a lower frequency of adverse effects when compared to intravenous administration). Patients who are receiving immunoglobulin and experience adverse events are sometimes recommended to take acetaminophen and diphenhydramine before their infusions to reduce the rate of adverse effects. Additional premedication may be required in some instances (especially when first getting accustomed to a new dosage), prednisone or another oral steroid.[ citation needed ]

Local side effects of immunoglobulin infusions most frequently include an injection site reaction (reddening of the skin around the injection site), itching, rash, and hives. [48] Less serious systemic side effects to immunoglobulin infusions include an increased heart rate, hyper or hypotension, an increased body temperature, diarrhea, nausea, abdominal pain, vomiting, arthralgia or myalgia, dizziness, headache, fatigue, fever, and pain. [48]

Serious side effects of immunoglobulin infusions in infants, children, [49] and adults include chest discomfort or pain, myocardial infarction, tachycardia, hyponatremia, hemolysis, hemolytic anemia, thrombosis, hepatitis, anaphylaxis, backache, aseptic meningitis, acute kidney injury, hypokalemic nephropathy, pulmonary embolism, and transfusion related acute lung injury. [48] hemoThere is also a small chance that even given the precautions taken in preparing immunoglobulin preparations, an immunoglobulin infusion may pass a virus to its recipient. [48] Some immunoglobulin solutions also contain isohemagglutinins, which in rare circumstances can cause hemolysis by the isohemagglutinins triggering phagocytosis. [50]

IVIG has long been known to induce a decrease in peripheral blood neutrophil count, or neutropenia in neonates, [51] and in patients with Idiopathic Thrombocytopenic Purpura, resolving spontaneously and without complications within 48 h. [52] Possible pathomechanisms include apoptosis/cell death due to antineutrophil antibodies with or without neutrophil migration into a storage pool outside the blood circulation. [53]

Immunoglobulin therapy interferes with the ability of the body to produce a normal immune response to an attenuated live-virus vaccine (like MMR) for up to a year, [48] can result in falsely elevated blood glucose levels, [48] and can interfere with many of the IgG-based assays often used to diagnose a patient with a particular infection. [54]

Routes of administration

1950s – intramuscular

After immunoglobulin therapy's discovery in 1952, weekly intramuscular injections of immunoglobulin (IMIg) were the norm until intravenous formulations (IVIg) began to be introduced in the 1980s. [55] During the mid and late 1950s,[ vague ] one-time IMIg injections were a common public health response to outbreaks of polio before the widespread availability of vaccines. Intramuscular injections were extremely poorly tolerated due to their extreme pain and poor efficacy – rarely could intramuscular injections alone raise plasma immunoglobulin levels enough to make a clinically meaningful difference. [55]

1980s – intravenous

Intravenous formulations began to be approved in the 1980s, which represented a significant improvement over intramuscular injections, as they allowed for a sufficient amount of immunoglobulin to be injected to reach clinical efficacy, although they still had a fairly high rate of adverse effects (though the addition of stabilizing agents reduced this further). [55]

1990s – subcutaneous

The first description of a subcutaneous route of administration for immunoglobulin therapy dates back to 1980, [56] but for many years subcutaneous administration was considered to be a secondary choice, only to be considered when peripheral venous access was no longer possible or tolerable. [55]

During the late 1980s and early 1990s,[ vague ] it became obvious that for at least a subset of patients the systemic adverse events associated with intravenous therapy were still not easily tolerable, and more doctors began to experiment with subcutaneous immunoglobulin administration, culminating in an ad hoc clinical trial in Sweden of 3000 subcutaneous injections administered to 25 adults (most of whom had previously experienced systemic adverse effects with IMIg or IVIg), where no infusion in the ad hoc trial resulted in a severe systemic adverse reaction, and most subcutaneous injections were able to be administered in non-hospital settings, allowing for considerably more freedom for the people involved. [55]

In the later 1990s,[ vague ] large-scale trials began in Europe to test the feasibility of subcutaneous immunoglobulin administration, although it was not until 2006 that the first subcutaneous-specific preparation of immunoglobulin was approved by a major regulatory agency (Vivaglobin, which was voluntarily discontinued in 2011). [55] [57] A number of other brand names of subcutaneous immunoglobulin have since been approved, although some small-scale studies have indicated that a particular cohort of patients with common variable immunodeficiency (CVID) may develop intolerable side effects with subcutaneous immunoglobulin (SCIg) that they do not with intravenous immunoglobulin (IVIg). [55]

Although intravenous was the preferred route for immunoglobulin therapy for many years, in 2006, the US Food and Drug Administration (FDA) approved the first preparation of immunoglobulin that was designed exclusively for subcutaneous use. [55]

Mechanism of action

The precise mechanism by which immunoglobulin therapy suppresses harmful inflammation is likely multifactorial. [58] For example, it has been reported that immunoglobulin therapy can block Fas-mediated cell death. [59]

Perhaps a more popular theory is that the immunosuppressive effects of immunoglobulin therapy are mediated through IgG's Fc glycosylation. By binding to receptors on antigen presenting cells, IVIG can increase the expression of the inhibitory Fc receptor, FcgRIIB, and shorten the half-life of auto-reactive antibodies. [60] [61] [62] The ability of immunoglobulin therapy to suppress pathogenic immune responses by this mechanism is dependent on the presence of a sialylated glycan at position CH2-84.4 of IgG. [60] Specifically, de-sialylated preparations of immunoglobulin lose their therapeutic activity and the anti-inflammatory effects of IVIG can be recapitulated by administration of recombinant sialylated IgG1 Fc. [60]

Sialylated-Fc-dependent mechanism was not reproduced in other experimental models suggesting that this mechanism is functional under a particular disease or experimental settings. [63] [64] [65] [66] On the other hand, several other mechanisms of action and the actual primary targets of immunoglobulin therapy have been reported. In particular, F(ab')2-dependent action of immunoglobulin to inhibit activation of human dendritic cells, [67] induction of autophagy, [68] induction of COX-2-dependent PGE-2 in human dendritic cells leading to expansion of regulatory T cells, [69] inhibition of pathogenic Th17 responses, [70] and induction of human basophil activation and IL-4 induction via anti-IgE autoantibodies. [71] [72] Some believe that immunoglobulin therapy may work via a multi-step model where the injected immunoglobulin first forms a type of immune complex in the patient. [73] Once these immune complexes are formed, they can interact with Fc receptors on dendritic cells, [74] which then mediate anti-inflammatory effects helping to reduce the severity of the autoimmune disease or inflammatory state.

Other proposed mechanisms include the possibility that donor antibodies may bind directly with the abnormal host antibodies, stimulating their removal; the possibility that IgG stimulates the host's complement system, leading to enhanced removal of all antibodies, including the harmful ones; and the ability of immunoglobulin to block the antibody receptors on immune cells (macrophages), leading to decreased damage by these cells, or regulation of macrophage phagocytosis. Indeed, it is becoming more clear that immunoglobulin can bind to a number of membrane receptors on T cells, B cells, and monocytes that are pertinent to autoreactivity and induction of tolerance to self. [60] [75]

A report stated that immunoglobulin application to activated T cells leads to their decreased ability to engage microglia. As a result of immunoglobulin treatment of T cells, the findings showed reduced levels of tumor necrosis factor-alpha and interleukin-10 in T cell-microglia co-culture. The results add to the understanding of how immunoglobulin may affect inflammation of the central nervous system in autoimmune inflammatory diseases. [76]

Hyperimmune globulin

Hyperimmune globulins are a class of immunoglobulins prepared in a similar way as for normal human immunoglobulin, except that the donor has high titers of antibody against a specific organism or antigen in their plasma. Some agents against which hyperimmune globulins are available include hepatitis B, rabies, tetanus toxin, varicella-zoster, etc. Administration of hyperimmune globulin provides "passive" immunity to the patient against an agent. This is in contrast to vaccines that provide "active" immunity. However, vaccines take much longer to achieve that purpose while hyperimmune globulin provides instant "passive" short-lived immunity. Hyperimmune globulin may have serious side effects, thus usage is taken very seriously.[ citation needed ]

Hyperimmune serum and plasma contain high amounts of an antibody, as a consequence of disease convalescence [77] or of repeated immunization. [78] Hyperimmune plasma is used in veterinary medicine, [79] and hyperimmune plasma derivatives are used to treat snakebite. [80] It has been hypothesized that hyperimmune serum may be an effective therapy for persons infected with the Ebola virus. [81]

Society and culture

Economics

In the United Kingdom a dose cost the NHS between £11.20 and £1,200.00 depending on the type and amount. [14] In the United States, antivenoms may cost thousands of dollars per dose because of markups that occur after manufacturing. [82]

Brand names

As biologicals, various brand names of immunoglobulin products are not necessarily interchangeable, and care must be exercised when changing between them. [83] Brand names of intravenous immunoglobulin formulations include Flebogamma, Gamunex, Privigen, Octagam, and Gammagard, while brand names of subcutaneous formulations include Cutaquig, Cuvitru, HyQvia, Hizentra, [27] [84] [85] Gamunex-C, and Gammaked. [86]

Supply issues

The United States is one of a handful of countries that allow plasma donors to be paid, meaning that the US supplies much of the plasma-derived medicinal products (including immunoglobulin) used across the world, including more than 50% of the European Union's supply. [87] The Council of Europe has officially endorsed the idea of not paying for plasma donations for both ethical reasons and reasons of safety, but studies have found that relying on entirely voluntary plasma donation leads to shortages of immunoglobulin and forces member countries to import immunoglobulin from countries that do compensate donors. [87]

In Australia, blood donation is voluntary and therefore to cope with increasing demand and to reduce the shortages of locally produced immunoglobulin, several programs have been undertaken including adopting plasma for first time blood donors, better processes for donation, plasma donor centres and encouraging current blood donors to consider plasma only donation. [88]

Research

Experimental results from a small clinical trial in humans suggested protection against the progression of Alzheimer's disease, but no such benefit was found in a subsequent phase III clinical trial. [89] [90] [91] In May 2020, the US approved a phase three clinical trial on the efficacy and safety of high-concentration intravenous immune globulin therapy in severe COVID-19. [92] Efficacy of heterologous immunoglobulin derivatives has been demonstrated in clinical trials of antivenoms for scorpion sting [93] and for snakebite. [94]

Related Research Articles

<span class="mw-page-title-main">Gamma globulin</span> Class of blood proteins

Gamma globulins are a class of globulins, identified by their position after serum protein electrophoresis. The most significant gamma globulins are immunoglobulins (antibodies), although some immunoglobulins are not gamma globulins, and some gamma globulins are not immunoglobulins.

Immunodeficiency, also known as immunocompromisation, is a state in which the immune system's ability to fight infectious diseases and cancer is compromised or entirely absent. Most cases are acquired ("secondary") due to extrinsic factors that affect the patient's immune system. Examples of these extrinsic factors include HIV infection and environmental factors, such as nutrition. Immunocompromisation may also be due to genetic diseases/flaws such as SCID.

<span class="mw-page-title-main">Hyaluronidase</span> Class of enzymes

Hyaluronidases are a family of enzymes that catalyse the degradation of hyaluronic acid. Karl Meyer classified these enzymes in 1971, into three distinct groups, a scheme based on the enzyme reaction products. The three main types of hyaluronidases are two classes of eukaryotic endoglycosidase hydrolases and a prokaryotic lyase-type of glycosidase.

This is a list of AIDS-related topics, many of which were originally taken from the public domain U.S. Department of Health Glossary of HIV/AIDS-Related Terms, 4th Edition.

<span class="mw-page-title-main">Hemolytic disease of the newborn</span> Fetal and neonatal alloimmune blood condition

Hemolytic disease of the newborn, also known as hemolytic disease of the fetus and newborn, HDN, HDFN, or erythroblastosis fetalis, is an alloimmune condition that develops in a fetus at or around birth, when the IgG molecules produced by the mother pass through the placenta. Among these antibodies are some which attack antigens on the red blood cells in the fetal circulation, breaking down and destroying the cells. The fetus can develop reticulocytosis and anemia. The intensity of this fetal disease ranges from mild to very severe, and fetal death from heart failure can occur. When the disease is moderate or severe, many erythroblasts are present in the fetal blood, earning these forms of the disease the name erythroblastosis fetalis.

<span class="mw-page-title-main">X-linked agammaglobulinemia</span> Medical condition

X-linked agammaglobulinemia (XLA) is a rare genetic disorder discovered in 1952 that affects the body's ability to fight infection. As the form of agammaglobulinemia that is X-linked, it is much more common in males. In people with XLA, the white blood cell formation process does not generate mature B cells, which manifests as a complete or near-complete lack of proteins called gamma globulins, including antibodies, in their bloodstream. B cells are part of the immune system and normally manufacture antibodies, which defend the body from infections by sustaining a humoral immunity response. Patients with untreated XLA are prone to develop serious and even fatal infections. A mutation occurs at the Bruton's tyrosine kinase (Btk) gene that leads to a severe block in B cell development and a reduced immunoglobulin production in the serum. Btk is particularly responsible for mediating B cell development and maturation through a signaling effect on the B cell receptor BCR. Patients typically present in early childhood with recurrent infections, in particular with extracellular, encapsulated bacteria. XLA is deemed to have a relatively low incidence of disease, with an occurrence rate of approximately 1 in 200,000 live births and a frequency of about 1 in 100,000 male newborns. It has no ethnic predisposition. XLA is treated by infusion of human antibody. Treatment with pooled gamma globulin cannot restore a functional population of B cells, but it is sufficient to reduce the severity and number of infections due to the passive immunity granted by the exogenous antibodies.

Hypogammaglobulinemia is an immune system disorder in which not enough gamma globulins are produced in the blood. This results in a lower antibody count, which impairs the immune system, increasing risk of infection. Hypogammaglobulinemia may result from a variety of primary genetic immune system defects, such as common variable immunodeficiency, or it may be caused by secondary effects such as medication, blood cancer, or poor nutrition, or loss of gamma globulins in urine, as in nonselective glomerular proteinuria. Patients with hypogammaglobulinemia have reduced immune function; important considerations include avoiding use of live vaccines, and take precautionary measures when traveling to regions with endemic disease or poor sanitation such as receiving immunizations, taking antibiotics abroad, drinking only safe or boiled water, arranging appropriate medical cover in advance of travel, and ensuring continuation of any immunoglobulin infusions needed.

Warm antibody autoimmune hemolytic anemia (WAIHA) is the most common form of autoimmune haemolytic anemia. About half of the cases are of unknown cause, with the other half attributable to a predisposing condition or medications being taken. Contrary to cold autoimmune hemolytic anemia which happens in cold temperature (28–31 °C), WAIHA happens at body temperature.

Common variable immunodeficiency (CVID) is an inborn immune disorder characterized by recurrent infections and low antibody levels, specifically in immunoglobulin (Ig) types IgG, IgM, and IgA. Symptoms generally include high susceptibility to pathogens, chronic lung disease, as well as inflammation and infection of the gastrointestinal tract.

Rho(D) immune globulin (RhIG) is a medication used to prevent RhD isoimmunization in mothers who are RhD negative and to treat idiopathic thrombocytopenic purpura (ITP) in people who are Rh positive. It is often given both during and following pregnancy. It may also be used when RhD-negative people are given RhD-positive blood. It is given by injection into muscle or a vein. A single dose lasts 12 weeks. It is made from human blood plasma.

In ABO hemolytic disease of the newborn maternal IgG antibodies with specificity for the ABO blood group system pass through the placenta to the fetal circulation where they can cause hemolysis of fetal red blood cells which can lead to fetal anemia and HDN. In contrast to Rh disease, about half of the cases of ABO HDN occur in a firstborn baby and ABO HDN does not become more severe after further pregnancies.

<span class="mw-page-title-main">X-linked severe combined immunodeficiency</span> Medical condition

X-linked severe combined immunodeficiency (X-SCID) is an immunodeficiency disorder in which the body produces very few T cells and NK cells.

<span class="mw-page-title-main">Selective immunoglobulin A deficiency</span> Medical condition

Selective immunoglobulin A (IgA) deficiency (SIgAD) is a kind of immunodeficiency, a type of hypogammaglobulinemia. People with this deficiency lack immunoglobulin A (IgA), a type of antibody that protects against infections of the mucous membranes lining the mouth, airways, and digestive tract. It is defined as an undetectable serum IgA level in the presence of normal serum levels of IgG and IgM, in persons older than 4 years. It is the most common of the primary antibody deficiencies. Most such persons remain healthy throughout their lives and are never diagnosed.

Hemolytic disease of the newborn (anti-Kell1) is the second most common cause of severe hemolytic disease of the newborn (HDN) after Rh disease. Anti-Kell1 is becoming relatively more important as prevention of Rh disease is also becoming more effective.

Hemolytic disease of the newborn (anti-Rhc) can range from a mild to a severe disease. It is the third most common cause of severe HDN. Rh disease is the most common and hemolytic disease of the newborn (anti-Kell) is the second most common cause of severe HDN. It occurs more commonly in women who are Rh D negative.

Primary immunodeficiencies are disorders in which part of the body's immune system is missing or does not function normally. To be considered a primary immunodeficiency (PID), the immune deficiency must be inborn, not caused by secondary factors such as other disease, drug treatment, or environmental exposure to toxins. Most primary immunodeficiencies are genetic disorders; the majority are diagnosed in children under the age of one, although milder forms may not be recognized until adulthood. While there are over 430 recognized inborn errors of immunity (IEIs) as of 2019, the vast majority of which are PIDs, most are very rare. About 1 in 500 people in the United States are born with a primary immunodeficiency. Immune deficiencies can result in persistent or recurring infections, auto-inflammatory disorders, tumors, and disorders of various organs. There are currently limited treatments available for these conditions; most are specific to a particular type of PID. Research is currently evaluating the use of stem cell transplants (HSCT) and experimental gene therapies as avenues for treatment in limited subsets of PIDs.

In immunology, passive immunity is the transfer of active humoral immunity of ready-made antibodies. Passive immunity can occur naturally, when maternal antibodies are transferred to the fetus through the placenta, and it can also be induced artificially, when high levels of antibodies specific to a pathogen or toxin are transferred to non-immune persons through blood products that contain antibodies, such as in immunoglobulin therapy or antiserum therapy. Passive immunization is used when there is a high risk of infection and insufficient time for the body to develop its own immune response, or to reduce the symptoms of ongoing or immunosuppressive diseases. Passive immunization can be provided when people cannot synthesize antibodies, and when they have been exposed to a disease that they do not have immunity against.

Hemolytic disease of the newborn (anti-RhE) is caused by the anti-RhE antibody of the Rh blood group system. The anti-RhE antibody can be naturally occurring, or arise following immune sensitization after a blood transfusion or pregnancy.

<span class="mw-page-title-main">IgG deficiency</span> Form of immune disorder

IgG deficiency is a form of dysgammaglobulinemia where the proportional levels of the IgG isotype are reduced relative to other immunoglobulin isotypes.

Vaccinia immune globulin (VIG) is made from the pooled blood of individuals who have been inoculated with the smallpox vaccine. The antibodies these individuals developed in response to the smallpox vaccine are removed and purified. This results in VIG. It can be administered intravenously. It is used to treat individuals who have developed progressive vaccinia after smallpox vaccination.

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