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Defects in the immune system can range from
hay fever to dermatitis
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Abnormal or undesirable immune functions can result in
- Asthma
- anaphylaxis
- diabetes
- rheumatoid arthritis
- graft rejection
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Immunopathology
study of disease associated with the overactivity of under activity of the immune response
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Hypersensitivity
allergy and autoimmunity
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Hypersensitivity or Immunodeficiency
immune system is incompletely developed, suppressed or destroyed
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Hypersensitivity four types: Type 1
anaphylaxis, allergies such as hay fever, asthma
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Hypersensitivity four types: Type 2
Blood group incompatibility, pernicious anemia, myasthenia gravis
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Hypersensitivity four types: Type 3
systemic lupus erythematosus, rheumatoid arthritis, serum sickness, rheumatic fever. (immune complex reaction)
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Hypersensitivity four types: Type 4
infection reaction, contact dermatitis, graft rejection- usually delayed reactions
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Allergy
exaggerated immune response manifested by inflammation (quickly)
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Hypersensitivity
delayed reactions
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Allergens
innocuous substance that induce allergy in sensitive individuals
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Atopy
Chronic local allergy such as hay fever or asthma
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Anaphylaxis
systemic, sometimes fatal reaction that involves airway obstruction and circulatory collapse
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Type 1 allergies
- usually relatively mild
- some last for lifetime, some "outgrown", others develop later in life
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Generalized _______ to allergens is inherited, not the allergy to a specific substance
susceptibility
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Genetic basis for atopy
- Increased IgE production- stimulates response, immune system jacked up to respond to actual substance (hypersensitivity)
- Increased reactivity of mast cells
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Inhalant
airborne environmental allergens such as pollen, house dust, dander, or fungal spores (dust mites, pollen)
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Ingestants
allergens that enter by mouth that cause food allergies (red dye, peanuts, shrimp, strawberries, shrimp)
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Injectant
allergies triggered by drugs vaccines or hymenopterans (bee) venom (penicillin)
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Contactants
- allergies that enter through the skin
- many are type 4 (delayed) hypersensitivity (lotion, detergent, latex glove)
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Corticosteriods
inhibit the activity of lymphocytes and reduce the production of IgE, have dangerous side effects and should not be taken for long periods
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Antihistamines
most widely used medications for preventing symptoms of atopic allergy
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Epinephrine (adrenaline)
reverse constriction of airways and slows the release of allergic mediators
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Type 2 hypersensitivities: Reactions that lyse foreign cells
- complement assisted destruction (lysis) of cells by antibodies directed against those cells' surface antigens
- -transfusion reactions
- -some types of autoimmunities
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RhoGAM antiserum Type 2: (3)
- Passive immunization for Rh- mother with an Rh+ fetus
- Injected at 28-32 weeks and again immediately after delivery
- Sequesters fetal RBCs that have escaped into maternal circulation and preventing sensitization (against red blood cells)
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Type 3 Hypersensitivities: Immune complex reactions
Soluble antigen reacts with antibody and forms large ____
Complexes
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Type 3 Hypersensitivities: Immune complex reactions
Complexes are deposited in various _____ in the body
tissues
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Type 3 Hypersensitivities: Immune complex reactions
Neutrophils release lysosomal granules that digest tissues and cause a destructive _______ condition
inflammatory
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Type 4 Hypersensitivities: Cell Mediated (Delayed) Reactions
Results when T cells respond to antigen displayed on self tissues or ________ ______ ______
transplanted foreign cells
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Type 4 Hypersensitivities: Cell Mediated (Delayed) Reactions
Symptoms arise from one to several days following the second contact with an antigen (2)
- Tuberculin reaction
- Contact dermatitis
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Autoimmune disease
individuals actually develop hypersensitivity to themselves
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Autoantibodies
begin to attack self
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Autoantibodies, T cells, or both
mount an abnormal attack against self antigens
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Systemic
involves several major organs
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Organ specific
involves only one organ or tissue
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Primary immunodeficiencies
present at birth (congenital), usually stemming from genetic errors
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Secondary immunodeficiencies
acquired after birth and caused by natural or artificial agents. Ex: HIV
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Most serious form of immunodeficiency
involves dysfunction in both lymphocyte systems
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SCID children require rigorous ________ techniques to protect them from opportunistic infections
Aseptic
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David Vetter
Lived life in a sterile plastic bubble
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