AUTOIMMUNE

Question 1

1. What is induced by immunization in the context of immune tolerance?
   a) Allergic response
   b) Immune activation
   c) Immune suppression
   d) Non-reactivity to self

Answer 1

d) Non-reactivity to self
Rationale: Immune tolerance refers to the immune system’s ability to not respond to certain antigens. Immunization can be used to induce this non-reactivity to self, thereby training the immune system to avoid responding to its own body’s cells and proteins.

Question 2

2. What is the primary location where self-reactive T cells are destroyed as a part of central tolerance?
   a) Bone marrow
   b) Liver
   c) Thymus
   d) Spleen

Answer 2

c) Thymus
Rationale: Central tolerance involves the elimination of self-reactive lymphocytes. For T cells, this process primarily takes place in the thymus.

Question 3

3. Where are self-reactive B cells typically destroyed?
   a) Thymus
   b) Spleen
   c) Bone marrow
   d) Lymph nodes

Answer 3

c) Bone marrow
Rationale: Central tolerance involves the elimination of self-reactive B cells primarily in the bone marrow.

Question 4

4. Which cells play a central role in maintaining the balance in peripheral tolerance?
   a) Memory B cells
   b) Neutrophils
   c) Regulatory T cells
   d) Basophils

Answer 4

c) Regulatory T cells
Rationale: Regulatory T cells, often referred to as Tregs, are essential for maintaining peripheral tolerance by ensuring a balance between different immune responses and preventing harmful autoimmune reactions.

Question 5

5. Th1 cells are primary mediators of which condition?
   a) Allergies
   b) Autoimmune diseases
   c) Bacterial infections
   d) Viral infections

Answer 5

b) Autoimmune diseases
Rationale: Th1 cells release proinflammatory cytokines and are major mediators of autoimmune diseases, where the immune system mistakenly attacks the body’s own cells.

Question 6

6. What do Th2 cells predominantly release?
   a) Proinflammatory cytokines
   b) Non-inflammatory cytokines
   c) Histamines
   d) Antibodies

Answer 6

b) Non-inflammatory cytokines
Rationale: Th2 cells are known to release cytokines that are not primarily inflammatory and are often involved in counteracting the proinflammatory response of Th1 cells.

Question 7

7. Loss of immune tolerance can lead to which of the following?
   a) Immunosuppression
   b) Autoimmune diseases
   c) Reduced antibody production
   d) Enhanced wound healing

Answer 7

b) Autoimmune diseases
Rationale: Loss of immune tolerance means the immune system might start reacting against self-antigens, which can lead to autoimmune diseases where the body attacks its own cells and tissues.

Question 8

8. Which describes the immune system’s random generation of sites directed against molecular configurations?
   a) Immune memory
   b) Antibody diversity
   c) Immune tolerance
   d) Peripheral defense

Answer 8

b) Antibody diversity
Rationale: The immune system’s ability to randomly generate various antibody sites ensures a wide range of antibody diversity, allowing it to recognize and combat a vast array of antigens.

Question 9

9. What can result when the immune system reacts with self-antigens?
   a) Immunodeficiency
   b) Enhanced immune memory
   c) Autoimmune diseases
   d) Immune acceleration

Answer 9

c) Autoimmune diseases
Rationale: If the immune system reacts with self-antigens, it can mistakenly attack the body’s own cells and tissues, leading to autoimmune diseases.

Question 10

10. Which cells release proinflammatory cytokines in response to foreign antigens?
    a) Th1
    b) Th2
    c) Memory B cells
    d) Basophils

Answer 10

a) Th1
Rationale: Th1 cells respond to foreign antigens by releasing proinflammatory cytokines to combat the perceived threat.

Question 11

11. Why do healthy individuals express detectable levels of autoimmune antibodies?
    a) To combat infections
    b) As a result of vaccine administration
    c) To maintain homeostasis
    d) Due to a genetic mutation

Answer 11

c) To maintain homeostasis
Rationale: Autoantibodies in healthy individuals can serve a regulatory function and play a role in maintaining homeostasis, ensuring the body’s internal environment remains stable.

Question 12

12. Which mechanism is responsible for removing aged red cells from human circulation?
    a) Immune tolerance
    b) Natural mechanism
    c) Peripheral defense
    d) Central tolerance

Answer 12

b) Natural mechanism
Rationale: Aged red cells are naturally removed from human circulation to maintain the health and functionality of the bloodstream.

Question 13

13. Which cells primarily mediate allergic reactions?
    a) Th1
    b) Th2
    c) Regulatory T cells
    d) Memory B cells

Answer 13

b) Th2
Rationale: Th2 cells are involved in immune responses against parasites and are also associated with allergic reactions.

Question 14

14. The immune system’s inability to attack its own cells and proteins is a description of:
    a) Immune activation
    b) Immune suppression
    c) Immune memory
    d) Immune tolerance

Answer 14

d) Immune tolerance
Rationale: Immune tolerance refers to the immune system’s ability to differentiate between foreign invaders and its own body, preventing it from attacking its own cells and proteins.

Question 15

15. Which organ is NOT directly involved in the process of central tolerance?
    a) Thymus
    b) Bone marrow
    c) Lymph nodes
    d) Liver

Answer 15

d) Liver
Rationale: Central tolerance involves the thymus (for T cells) and bone marrow (for B cells) in the elimination of self-reactive lymphocytes. The liver is not directly involved in this process.

Question 16

1. What causes damage in autoimmune diseases?
   a) Infections
   b) Foreign bodies
   c) Autoantibodies or autoreactive cells
   d) External injuries

Answer 16

c) Autoantibodies or autoreactive cells
Rationale: Autoimmune diseases result from the body’s immune system attacking its own tissues, which is mediated by autoantibodies or autoreactive cells.

Question 17

2. Which cell type is often involved in triggering autoimmune reactions?
   a) CD8 T-cells
   b) B-cells
   c) CD4 helper T-cells
   d) Macrophages

Answer 17

c) CD4 helper T-cells
Rationale: In autoimmune diseases, self-reactive CD4 helper T-cells are generally associated with inducing either cell-mediated or antibody-mediated autoimmune reactions.

Question 18

3. Which of the following is a systemic autoimmune disease?
   a) Multiple Sclerosis (MS)
   b) Myasthenia Gravis
   c) Systemic Lupus Erythematosus (SLE)
   d) Grave’s Disease

Answer 18

c) Systemic Lupus Erythematosus (SLE)
Rationale: Systemic Lupus Erythematosus (SLE) affects multiple organ systems, classifying it as a systemic autoimmune disease, whereas the others are more organ-specific.

Question 19

4. What is the primary treatment approach for Rheumatoid Arthritis (RA)?
   a) Hormone Replacement
   b) Anti-Inflammatory Drugs
   c) Cholinesterase Inhibitors
   d) Plasmapheresis

Answer 19

b) Anti-Inflammatory Drugs
Rationale: RA is primarily treated with anti-inflammatory drugs to reduce inflammation and pain associated with the condition.

Question 20

5. Which autoimmune disease involves the immune system attacking the thyroid cells, reducing thyroid hormone production?
   a) Grave’s Disease
   b) Multiple Sclerosis
   c) Pernicious Anemia
   d) Hashimoto’s Thyroiditis

Answer 20

d) Hashimoto’s Thyroiditis
Rationale: In Hashimoto’s Thyroiditis, the immune system targets the thyroid cells, leading to an inability of the thyroid gland to produce sufficient thyroid hormones.

Question 21

6. Which treatment is beneficial for Myasthenia Gravis?
   a) Splenectomy
   b) Cholinesterase Inhibitors and Thymectomy
   c) Plasmapheresis
   d) Metabolic Control

Answer 21

b) Cholinesterase Inhibitors and Thymectomy
Rationale: Myasthenia Gravis patients benefit from cholinesterase inhibitors (to improve muscle function) and thymectomy (removal of the thymus gland, which often shows abnormalities in these patients).

Question 22

7. Which autoimmune disease primarily affects the nervous system and leads to damage in the brain and spinal cord?
   a) Rheumatoid Arthritis (RA)
   b) Multiple Sclerosis (MS)
   c) Systemic Lupus Erythematosus (SLE)
   d) Grave’s Disease

Answer 22

b) Multiple Sclerosis (MS)
Rationale: Multiple Sclerosis (MS) targets the central nervous system, leading to inflammation, damage, and scarring of the myelin sheath in the brain and spinal cord.

Question 23

8. Which treatment approach involves the removal of certain components from blood?
   a) Anti-Inflammatory Drugs
   b) Splenectomy
   c) Plasmapheresis
   d) Hormone Replacement

Answer 23

c) Plasmapheresis
Rationale: Plasmapheresis is a process that filters the blood to remove harmful antibodies or other components, and it’s used in certain autoimmune conditions like SLE and GBS.

Question 24

9. Which autoimmune disease results in muscle weakness due to a breakdown in the communication between nerves and muscles?
   a) Myasthenia Gravis
   b) Pernicious Anemia
   c) Rheumatoid Arthritis (RA)
   d) Type 1 Diabetes

Answer 24

a) Myasthenia Gravis
Rationale: Myasthenia Gravis involves the production of antibodies that block or destroy muscle receptor sites, leading to a decline in muscle communication and resultant muscle weakness.

Question 25

10. Which condition involves the body's immune system targeting the intrinsic factor, leading to a deficiency of vitamin B12? a) Hashimoto's Thyroiditis b) Pernicious Anemia c) Grave's Disease d) Good Pasture Syndrome

Answer 25

b) Pernicious Anemia Rationale: Pernicious Anemia is caused when the body's immune system targets the intrinsic factor (a protein essential for the absorption of vitamin B12), leading to a vitamin B12 deficiency.

Question 26

1. Which autoimmune disease primarily affects the synovial membrane leading to potential cartilage and bone damage? A. Systemic Lupus Erythematosus (SLE) B. Goodpasture Syndrome C. Rheumatoid Arthritis D. Myasthenia Gravis

Answer 26

C. Rheumatoid Arthritis Rationale: Rheumatoid Arthritis is characterized by inflammation primarily in the synovial membrane which can lead to cartilage and bone damage.

Question 27

2. Which distinctive rash is a pathognomonic sign of SLE? A. Malar rash B. Discoid rash C. Roseola rash D. Ringworm rash

Answer 27

A. Malar rash Rationale: A malar rash, or "butterfly rash", is a pathognomonic sign of SLE. Its presence confirms the disease.

Question 28

3. Goodpasture Syndrome predominantly affects which two organs? A. Liver and Heart B. Lungs and Kidneys C. Skin and Brain D. Joints and Muscles

Answer 28

B. Lungs and Kidneys Rationale: Goodpasture Syndrome affects the lungs and kidneys with the presence of antibodies targeting Type IV collagen.

Question 29

4. Which antibody is characteristically found in Rheumatoid Arthritis? A. Anti-dsDNA B. Rheumatoid factor (IgM against own IgG) C. Antibody directed at Type IV collagen D. Antinuclear antibody (ANA)

Answer 29

B. Rheumatoid factor (IgM against own IgG) Rationale: Rheumatoid factor (IgM against one's own IgG) is a characteristic feature of Rheumatoid Arthritis.

Question 30

5. What do the initials ANA stand for in the context of autoimmune diseases? A. Anti-Nephrotic Antibody B. Antinuclear Antibody C. Anti-Neuralgic Acid D. Antinuclear Actin

Answer 30

B. Antinuclear Antibody Rationale: ANA stands for Antinuclear Antibody, which is often associated with autoimmune diseases, especially SLE.

Question 31

6. Which autoimmune disease involves the immune system attacking Type IV collagen? A. Rheumatoid Arthritis B. Systemic Lupus Erythematosus (SLE) C. Goodpasture Syndrome D. Myasthenia Gravis

Answer 31

C. Goodpasture Syndrome Rationale: Goodpasture Syndrome is characterized by the presence of antibodies that target Type IV collagen, affecting the lungs and kidneys.

Question 32

7. Which diagnostic criteria mnemonic is used for Systemic Lupus Erythematosus (SLE)? A. SOAP RASH MD B. SOAP BRAIN MD C. SLE CRITERIA D. LUPUS DIAGNOSE

Answer 32

B. SOAP BRAIN MD Rationale: The mnemonic SOAP BRAIN MD is used to remember the diagnostic criteria for SLE.

Question 33

8. In which autoimmune disease is there a hyperactive immune system with multiple abnormalities? A. Rheumatoid Arthritis B. Systemic Lupus Erythematosus (SLE) C. Goodpasture Syndrome D. Hashimoto's Thyroiditis

Answer 33

B. Systemic Lupus Erythematosus (SLE) Rationale: SLE demonstrates a hyperactive immune system with multiple abnormalities, characterized by a vast array of autoantibodies.

Question 34

9. The butterfly rash, if present, confirms the diagnosis of which disease? A. Rheumatoid Arthritis B. Systemic Lupus Erythematosus (SLE) C. Goodpasture Syndrome D. Chronic (Hashimoto) Thyroiditis

Answer 34

B. Systemic Lupus Erythematosus (SLE) Rationale: The butterfly rash, or malar rash, is a pathognomonic sign of SLE. Its presence confirms the disease.

Question 35

10. How many symptoms from the SOAP BRAIN MD mnemonic are needed to formulate a diagnosis for SLE? A. 3 out of 11 B. 4 out of 11 C. 5 out of 11 D. 6 out of 11

Answer 35

B. 4 out of 11 Rationale: To formulate a diagnosis for Systemic Lupus Erythematosus (SLE), 4 out of the 11 criteria from the SOAP BRAIN MD mnemonic are needed.

Question 36

Which autoimmune disease primarily targets myelin basic proteins in the CNS? a) Myasthenia Gravis b) Multiple Sclerosis c) Hashimoto's Thyroiditis d) Guillain-Barre Syndrome

Answer 36

b) Multiple Sclerosis Rationale: Multiple Sclerosis is characterized by the immune response against myelin basic proteins leading to demyelination in the CNS.

Question 37

In Myasthenia Gravis, the interaction with which neurotransmitter is blocked by antibodies? a) Dopamine b) Serotonin c) GABA d) Acetylcholine

Answer 37

d) Acetylcholine Rationale: In Myasthenia Gravis, antibodies block acetylcholine receptors, causing faulty neuromuscular signal transmission.

Question 38

What is a primary manifestation of Hashimoto's Thyroiditis? a) Hyperthyroidism b) Hypothyroidism c) Hypoglycemia d) Hyperglycemia

Answer 38

b) Hypothyroidism Rationale: Hashimoto's Thyroiditis is characterized by an autoimmune attack on the thyroid gland, leading to reduced production of thyroid hormones and causing hypothyroidism.

Question 39

Which disease involves antibodies that block thyroid-stimulating hormone receptors? a) Grave's Disease b) Type 1 Diabetes c) Pernicious Anemia d) Guillain-Barre Syndrome

Answer 39

a) Grave's Disease Rationale: Grave's Disease is characterized by antibodies that block thyroid-stimulating hormone receptors, leading to hyperthyroidism.

Question 40

Type 1 Diabetes is primarily due to the destruction of which cells in the pancreas? a) Alpha cells b) Delta cells c) Beta cells d) Gamma cells

Answer 40

c) Beta cells Rationale: Type 1 Diabetes is a result of the immune system destroying the Beta cells of the pancreas, which produce insulin.

Question 41

In Pernicious Anemia, the malabsorption of which vitamin is a primary issue? a) Vitamin A b) Vitamin C c) Vitamin D d) Vitamin B12

Answer 41

d) Vitamin B12 Rationale: Pernicious Anemia is characterized by the inability to absorb vitamin B12 due to the loss of intrinsic factor.

Question 42

Which disorder is associated with the immune-mediated destruction of platelets? a) Myasthenia Gravis b) Grave's Disease c) Idiopathic Thrombocytopenia Purpura d) Multiple Sclerosis

Answer 42

c) Idiopathic Thrombocytopenia Purpura Rationale: ITP is characterized by antibody-mediated platelet destruction, leading to symptoms like petechiae and bleeding issues.

Question 43

Guillain-Barre Syndrome is predominantly mediated by which type of cells? a) B cells b) T cells c) Plasma cells d) Mast cells

Answer 43

b) T cells Rationale: Guillain-Barre Syndrome involves an immune reaction against myelin, and it is mainly T-cell mediated.

Question 44

Which autoimmune disorder has muscle weakness and fatigue as its primary manifestations? a) Myasthenia Gravis b) Grave's Disease c) Multiple Sclerosis d) Pernicious Anemia

Answer 44

a) Myasthenia Gravis Rationale: Myasthenia Gravis is characterized by faulty neuromuscular signal transmission due to antibodies blocking acetylcholine receptors, leading to muscle weakness and fatigue.

Question 45

Which of the following disorders results from an immune response to Type IV collagen? a) Multiple Sclerosis b) Guillain-Barre Syndrome c) Goodpasture Syndrome d) Grave's Disease

Answer 45

c) Goodpasture Syndrome Rationale: Goodpasture Syndrome involves an immune attack on Type IV collagen, affecting both the lungs and kidneys.

Question 46

Which disease is characterized by a "butterfly rash" on the face? a) Guillain-Barre Syndrome b) Multiple Sclerosis c) Systemic Lupus Erythematosus (SLE) d) Grave's Disease

Answer 46

c) Systemic Lupus Erythematosus (SLE) Rationale: The butterfly rash is a pathognomonic sign of SLE, indicating its presence with certainty when observed.

Question 47

In which condition are antibodies produced against thyroglobulin (anti-Tg) and thyroid peroxidase (anti-TPO) antigens? a) Myasthenia Gravis b) Pernicious Anemia c) Chronic Thyroiditis (Hashimoto) d) Type 1 Diabetes

Answer 47

c) Chronic Thyroiditis (Hashimoto) Rationale: Hashimoto's Thyroiditis involves the production of autoantibodies directed against thyroglobulin and thyroid peroxidase antigens, leading to hypothyroidism.

Question 48

Which autoimmune disorder is associated with leg weakness that progresses proximally? a) Guillain-Barre Syndrome b) Multiple Sclerosis c) Grave's Disease d) Myasthenia Gravis

Answer 48

a) Guillain-Barre Syndrome Rationale: Guillain-Barre Syndrome manifests as leg weakness that gradually progresses upwards to affect other body parts, including the arms and face.

Question 49

Which autoimmune disorder leads to hyperthyroidism due to antibodies mimicking thyrotropin? a) Multiple Sclerosis b) Grave's Disease c) Guillain-Barre Syndrome d) Chronic Thyroiditis (Hashimoto)

Answer 49

b) Grave's Disease Rationale: Grave's Disease involves antibodies that mimic thyrotropin, leading to the proliferation of thyroid cells and hyperthyroidism.

Question 50

Which autoimmune disease results in the inability to synthesize insulin? a) Guillain-Barre Syndrome b) Grave's Disease c) Type 1 Diabetes d) Pernicious Anemia

Answer 50

c) Type 1 Diabetes Rationale: Type 1 Diabetes arises from the immune-mediated destruction of the Beta cells in the pancreas, leading to the inability to produce insulin.

Question 51

Which disorder is characterized by the absence of normal thymic tissue and severe infections due to a failure in the immune system? a. DiGeorge Syndrome b. X-linked Agammaglobulinemia c. Chronic Granulomatous Disease d. Severe Combined Immunodeficiency (SCID)

Answer 51

d. Severe Combined Immunodeficiency (SCID) Rationale: SCID is defined by the absence of normal thymic tissue and the failure of both the cellular and humoral components of the immune system, leading to severe infections.

Question 52

Which disorder is linked with chromosome 22q11 deletions and cardiac defects? a. Common Variable Immunodeficiency b. DiGeorge Syndrome c. ADA Deficiency d. Hyper-IgE Immunodeficiency

Answer 52

b. DiGeorge Syndrome Rationale: DiGeorge Syndrome results from defective embryonic development affecting the thymus, parathyroids, and cardiac outflow tract. It is associated with chromosome 22q11 deletions.

Question 53

Which immunodeficiency primarily presents in early childhood with recurrent infections mainly from encapsulated bacteria? a. ADA Deficiency b. Hyper-IgE Immunodeficiency c. X-linked Agammaglobulinemia d. Hyper-IgM Immunodeficiency

Answer 53

c. X-linked Agammaglobulinemia Rationale: X-linked Agammaglobulinemia presents in early childhood with recurrent infections, especially from encapsulated bacteria, due to a defect in the pre-B lymphocyte maturation stage.

Question 54

ADA deficiency leads to the accumulation of which toxic metabolites? a. Intracellular purine b. Adenosine c. IgE d. IgA

Answer 54

b. Adenosine Rationale: ADA Deficiency results in the accumulation of toxic adenosine metabolites due to a malfunction of the ADA enzyme in the purine salvage pathway.

Question 55

Which disease is an X-linked disorder that affects granulocyte function and presents with recurrent skin infections? a. Selective IgA Deficiency b. Hyper-IgM Immunodeficiency c. Chronic Granulomatous Disease d. Hyper-IgE Immunodeficiency

Answer 55

c. Chronic Granulomatous Disease Rationale: Chronic Granulomatous Disease is X-linked, affecting granulocyte function, leading to recurrent skin infections, abscesses, and granulomas.

Question 56

Which immunodeficiency disorder results in a marked reduction in antibody production and is associated with recurrent sinopulmonary infections? a. ADA Deficiency b. Common Variable Immunodeficiency c. DiGeorge Syndrome d. X-linked Agammaglobulinemia

Answer 56

b. Common Variable Immunodeficiency Rationale: Common Variable Immunodeficiency's primary immunologic abnormality is a significant reduction in antibody production, leading to recurrent infections like sinusitis, otitis, and pneumonia.

Question 57

Which disorder is characterized by notably high IgE levels and symptoms like eczematous dermatitis and osteopenia? a. Chronic Granulomatous Disease b. Hyper-IgE Immunodeficiency c. DiGeorge Syndrome d. Hyper-IgM Immunodeficiency

Answer 57

b. Hyper-IgE Immunodeficiency Rationale: Hyper-IgE Immunodeficiency is defined by extremely high IgE levels and various symptoms, including eczematous dermatitis, osteopenia, and more.

Question 58

In which disorder are Serum IgA levels markedly depressed, often less than 5 mg/dL? a. X-linked Agammaglobulinemia b. ADA Deficiency c. Selective IgA Deficiency d. Hyper-IgM Immunodeficiency

Answer 58

c. Selective IgA Deficiency Rationale: Selective IgA Deficiency is characterized by severely reduced serum IgA levels, often dropping below 5 mg/dL.

Question 59

Which immunodeficiency results from a retroviral infection and leads to severe CD4 T lymphocyte dysfunction? a. Common Variable Immunodeficiency b. Hyper-IgE Immunodeficiency c. ADA Deficiency d. Acquired Immunodeficiency Syndrome (AIDS)

Answer 59

d. Acquired Immunodeficiency Syndrome (AIDS) Rationale: AIDS is caused by the HIV retrovirus, resulting in severe CD4 T lymphocyte dysfunction, opportunistic infections, and malignancies.

Question 60

Which enzyme is responsible for the metabolism of adenosine in the purine salvage pathway? a. Catalase b. NADPH oxidase c. Adenosine Deaminase (ADA) d. Purine Nucleoside Phosphorylase (PNP)

Answer 60

c. Adenosine Deaminase (ADA) Rationale: ADA is an enzyme in the purine salvage pathway responsible for metabolizing adenosine.

Question 61

Which disorder is characterized by a defect that results in the accumulation of intracellular purine metabolites, affecting T lymphocyte function? a. Hyper-IgM Immunodeficiency b. Chronic Granulomatous Disease c. Purine Nucleoside Phosphorylase (PNP) Deficiency d. ADA Deficiency

Answer 61

c. Purine Nucleoside Phosphorylase (PNP) Deficiency Rationale: PNP Deficiency leads to the accumulation of intracellular purine metabolites due to depressed PNP activity, resulting in functional abnormalities in T lymphocytes.

Question 62

Which disease is known for its defective gene coding that inhibits oxidative metabolism, compromising neutrophil killing activity? a. Selective IgA Deficiency b. Chronic Granulomatous Disease c. Hyper-IgE Immunodeficiency d. Common Variable Immunodeficiency

Answer 62

b. Chronic Granulomatous Disease Rationale: Chronic Granulomatous Disease has defects in the gene coding for NADPH oxidase, which compromises the neutrophil killing activity due to inhibited oxidative metabolism.

Question 63

Which disorder leads to increased production of IgM but no production of IgG or IgA due to defective expression of CD154? a. Hyper-IgE Immunodeficiency b. Hyper-IgM Immunodeficiency c. ADA Deficiency d. Common Variable Immunodeficiency

Answer 63

b. Hyper-IgM Immunodeficiency Rationale: Hyper-IgM Immunodeficiency is characterized by the defective expression of CD154, which impairs B-cell isotype switching, resulting in the production of IgM but not IgG or IgA.

Question 64

What is the most common opportunistic infection associated with HIV infection? a. Kaposi's sarcoma b. Oral candidiasis (thrush) c. Pneumocystis jirovecii lung infection d. Hairy leukoplakia

Answer 64

c. Pneumocystis jirovecii lung infection Rationale: The lung infection with Pneumocystis jirovecii is the most common opportunistic infection associated with HIV infection.

Question 65

Which disease is characterized by profound T lymphocytopenia due to thymic aplasia and is not associated with a significant decrease in B lymphocytes or immunoglobulin production in most patients? a. Common Variable Immunodeficiency b. ADA Deficiency c. X-linked Agammaglobulinemia d. Congenital Thymic Aplasia (DiGeorge Syndrome)

Answer 65

d. Congenital Thymic Aplasia (DiGeorge Syndrome) Rationale: DiGeorge Syndrome results in profound T lymphocytopenia due to thymic aplasia, but in most patients, B lymphocytes and immunoglobulin production are unaffected.

Question 66

Which enzyme deficiency leads to extreme cytopenia of both B and T lymphocytes due to the buildup of toxic metabolites? a. Catalase b. Adenosine Deaminase (ADA) c. Purine Nucleoside Phosphorylase (PNP) d. NADPH oxidase

Answer 66

b. Adenosine Deaminase (ADA) Rationale: ADA deficiency results in the accumulation of toxic adenosine metabolites, leading to extreme cytopenia of both B and T lymphocytes.

Question 67

Which disorder commonly presents with GI malabsorption, autoimmune disorders, and neoplasms and is the most common primary immune deficiency disorder in adults? a. Common Variable Immunodeficiency b. Hyper-IgE Immunodeficiency c. ADA Deficiency d. X-linked Agammaglobulinemia

Answer 67

a. Common Variable Immunodeficiency Rationale: Common Variable Immunodeficiency is the most common primary immune deficiency in adults and is associated with various complications including GI malabsorption, autoimmune disorders, and neoplasms.

Question 68

Which disorder results in patients being very susceptible to viruses but generally not to parasites? a. Immunodeficiency disorders b. Hyper-IgE Immunodeficiency c. ADA Deficiency d. Chronic Granulomatous Disease

Answer 68

a. Immunodeficiency disorders Rationale: Immunodeficiency disorders, in general, make patients susceptible to viruses but usually not to parasites. However, exceptions include disorders like X-linked agammaglobulinemia and common variable immunodeficiency.

Question 69

Which of the following organisms is the most common pathogen associated with Chronic Granulomatous Disease? a. H. influenza b. S. pneumoniae c. S. aureus d. C. albicans

Answer 69

c. S. aureus Rationale: In patients with Chronic Granulomatous Disease, S. aureus is the most commonly identified pathogen.

Question 70

In which immunodeficiency disorder are IgA levels extremely low, leading to an increased risk for transfusion reactions to certain blood products? a. X-linked Agammaglobulinemia b. Hyper-IgM Immunodeficiency c. ADA Deficiency d. Selective IgA Deficiency

Answer 70

d. Selective IgA Deficiency Rationale: Selective IgA Deficiency