Immune Deficiency and ENT Manifestations — MCQs
An unimmunized 5 -year-old child presents to the OPD with a white membranous layer on the throat upon inspection. The child's brother is immunized. What is the first step in management?
WHO AIDS defining illnesses are all EXCEPT:
Which of the following disorders presents with repeated catalase positive infections?
In primary immune deficiency, the following plasma protein fraction can be reduced:
Which of the following statements about malignant otitis externa is true?
Agammaglobulinemia can present with?
A patient with a recent upper respiratory infection develops facial pain and tenderness over the maxillary sinuses. What is the most appropriate initial treatment?
What is the primary cause of Common Variable Immunodeficiency (CVID)?
A 5-year-old male child presents to the clinic with a history of recurrent infections. On examination, he was found to have rashes. On routine blood investigation, a low platelet count was found. What will be the diagnosis?
Mass Drug Administration is NOT routinely used as the primary strategy for:
Immune Deficiency and ENT Manifestations Indian Medical PG Practice Questions and MCQs
Question 1: An unimmunized 5 -year-old child presents to the OPD with a white membranous layer on the throat upon inspection. The child's brother is immunized. What is the first step in management?
- A. Diphtheria antitoxin (Correct Answer)
- B. Diphtheria toxoid
- C. Penicillin
- D. Isolation and supportive care
- E. Tracheostomy
Explanation: ***Diphtheria antitoxin*** - The presence of a **white membranous layer** on the **throat** in an **unimmunized child**, along with the high contagiousness (brother's immunization is relevant to exposure), strongly suggests **diphtheria**. - **Diphtheria antitoxin (DAT)** is the crucial first-line treatment to neutralize the **exotoxin** produced by *Corynebacterium diphtheriae*, which is responsible for the severe systemic effects. - Antitoxin must be administered **immediately** without waiting for culture confirmation, as it only neutralizes unbound toxin. *Diphtheria toxoid* - **Diphtheria toxoid** is used for **active immunization** (vaccination) to prevent diphtheria, not for emergency treatment of an active infection. - Administering toxoid during an acute infection would not rapidly neutralize the circulating toxin. *Penicillin* - **Penicillin** (or erythromycin) is used to **eradicate the bacteria** (*Corynebacterium diphtheriae*) from the patient's throat and prevent further toxin production and transmission. - While important for source control, it does not neutralize the pre-formed toxin, which is the immediate threat to life. - Antibiotics should be given **after** antitoxin administration. *Isolation and supportive care* - **Isolation** is essential to prevent transmission, but it does not treat the patient's infection. - **Supportive care** is also crucial, but it addresses symptoms rather than the underlying cause or the effects of the toxin. *Tracheostomy* - **Tracheostomy** may be required later for airway obstruction if the membrane extends to the larynx or causes significant respiratory compromise. - However, it is **not the first step** in management; securing airway patency comes after antitoxin administration unless there is immediate life-threatening airway obstruction. - The priority is neutralizing the toxin to prevent further membrane formation and systemic complications.
Question 2: WHO AIDS defining illnesses are all EXCEPT:
- A. Persistent generalized lymphadenopathy (Correct Answer)
- B. P. carinii pneumonia
- C. CMV retinitis
- D. Oropharyngeal candidiasis
Explanation: ***Persistent generalized lymphadenopathy*** - While associated with HIV infection, **persistent generalized lymphadenopathy** itself is not classified as an **AIDS-defining illness** by the WHO or CDC, but rather a common manifestation of chronic HIV infection (Stage 1 or 2) [1]. - AIDS-defining illnesses are typically severe opportunistic infections or cancers that occur when the immune system is severely compromised (CD4 count below 200 cells/µL). *P. carinii pneumonia* - **P. carinii pneumonia** (now known as **Pneumocystis jirovecii pneumonia** or **PJP**) is a classic and common **AIDS-defining opportunistic infection**. - Its presence indicates severe immunosuppression, often with CD4 counts below 200 cells/µL. *CMV retinitis* - **Cytomegalovirus (CMV) retinitis** is a severe opportunistic infection, particularly of the eye, that is recognized as an **AIDS-defining illness**. - It signifies profound immunodeficiency, typically with CD4 counts below 50 cells/µL. *Oropharyngeal candidiasis* - While common in HIV-infected individuals, **oropharyngeal candidiasis** (thrush) alone is generally not considered an **AIDS-defining illness** [1]. - It is classified as an HIV Stage 2 condition, indicating moderate immune compromise rather than severe, AIDS-defining immunosuppression [1].
Question 3: Which of the following disorders presents with repeated catalase positive infections?
- A. Chediak higashi syndrome
- B. SCID
- C. X linked hypogammaglobulinemia
- D. CGD (Correct Answer)
Explanation: ***CGD*** - Chronic Granulomatous Disease (CGD) is characterized by a defect in **NADPH oxidase**, preventing phagocytes from producing a **respiratory burst** to kill certain bacteria and fungi. - Patients with CGD are particularly susceptible to infections by **catalase-positive organisms** because these organisms degrade hydrogen peroxide, which CGD phagocytes rely on for killing. *Chediak higashi syndrome* - This syndrome involves defective lysosomal trafficking, leading to impaired neutrophil chemotaxis and degranulation, resulting in recurrent infections, but not specifically to **catalase-positive organisms**. - Other features include **partial albinism**, peripheral neuropathy, and normal respiratory burst. *SCID* - Severe Combined Immunodeficiency (SCID) involves a profound defect in both **T-cell and B-cell immunity**, leading to severe and recurrent infections by a wide range of pathogens, not limited to catalase-positive ones [1]. - Patients typically present in infancy with **failure to thrive**, opportunistic infections, and lack of lymphoid tissue [1]. *X linked hypogammaglobulinemia* - Also known as **Bruton's agammaglobulinemia**, this disorder involves a defect in B-cell maturation, leading to the absence of antibodies and recurrent bacterial infections [1]. - The infections are typically with **encapsulated bacteria** and are not specifically linked to catalase-positive organisms [1].
Question 4: In primary immune deficiency, the following plasma protein fraction can be reduced:
- A. Alpha2 globulin
- B. Gamma globulin (Correct Answer)
- C. Alpha1 globulin
- D. Beta globulin
Explanation: ***Gamma globulin*** - In primary immune deficiency, there is a significant reduction in **gamma globulin**, resulting from impaired antibody production [1]. - This protein fraction primarily contains **immunoglobulins**, which are crucial for the immune response [1][2]. *Alpha1 globulin* - Typically associated with **protease inhibitors** and **transport proteins**, its levels are not directly impacted in primary immune deficiency. - This fraction does not primarily play a role in the **immune response** like gamma globulins do. *Alpha2 globulin* - Contains **haptoglobin** and **ceruloplasmin**, which often remain stable in immunodeficiencies. - Its reduction is not characteristic of primary immune deficiency, as it does not directly relate to **antibody function**. *Beta globulin* - Includes fractions such as **transferrin** and **complement proteins**, generally unaffected by primary immune deficiencies. - While important, these proteins do not primarily comprise **antibodies** and do not show a decrease in these conditions.
Question 5: Which of the following statements about malignant otitis externa is true?
- A. Not painful
- B. Common in diabetics and old age (Correct Answer)
- C. Caused by streptococcus
- D. Responds to topical antibiotics alone
Explanation: ***Common in diabetics and old age*** - **Malignant otitis externa** is an aggressive infection primarily affecting the external auditory canal and surrounding structures. - It most commonly occurs in **immunocompromised individuals**, especially **elderly diabetics**, due to impaired immune response and microvascular complications. *Not painful* - Malignant otitis externa is characterized by **severe, unrelenting otalgia (ear pain)** that often worsens at night and is disproportionate to the clinical findings. - The pain is due to the **inflammatory and destructive process** involving cartilage, bone, and nerves. *Caused by streptococcus* - The most common causative organism for malignant otitis externa is **Pseudomonas aeruginosa** (>90% of cases), not Streptococcus. - **Streptococcus species** are more commonly associated with acute otitis media or common skin infections. *Responds to topical antibiotics alone* - Malignant otitis externa requires **prolonged systemic antibiotic therapy** (typically 4-6 weeks of intravenous or oral fluoroquinolones like ciprofloxacin). - Topical antibiotics alone are **insufficient** due to the invasive nature of the infection, which extends beyond the external canal to involve bone and soft tissues.
Question 6: Agammaglobulinemia can present with?
- A. Rhinitis
- B. Bronchiectasis
- C. Giardia infections
- D. All of the options (Correct Answer)
Explanation: ***All of the options*** - **Agammaglobulinemia**, characterized by the absence of **B cells** and very low levels of antibodies, leads to significant **immunodeficiency** [1]. - This deficiency results in a broad range of infections and inflammatory conditions affecting various body systems, encompassing all the listed options. *Rhinitis* - Patients with agammaglobulinemia are prone to **recurrent bacterial infections** of the upper respiratory tract [1]. - This susceptibility often manifests as **chronic or recurrent rhinitis** and sinusitis due to impaired antibody-mediated host defense [1]. *Bronchiectasis* - Due to frequent and inadequately controlled **bacterial infections of the lower respiratory tract**, such as pneumonia and bronchitis. - These chronic infections can cause irreversible damage and dilation of the **bronchial airways**, leading to bronchiectasis. *Giardia infections* - **Agammaglobulinemia** severely impairs the body's ability to produce **IgA antibodies**, which are crucial for mucosal immunity in the gastrointestinal tract. - This deficiency makes patients highly susceptible to **chronic and severe infections** with enteric pathogens, such as *Giardia lamblia* [1].
Question 7: A patient with a recent upper respiratory infection develops facial pain and tenderness over the maxillary sinuses. What is the most appropriate initial treatment?
- A. Amoxicillin-clavulanate (Correct Answer)
- B. Corticosteroid
- C. Antihistamine
- D. Topical decongestant
Explanation: ***Amoxicillin-clavulanate*** - This antibiotic combination is the **first-line empirical treatment** for **acute bacterial rhinosinusitis**, especially if symptoms persist or worsen after 7-10 days, or are severe at presentation. - It provides broad-spectrum coverage against common bacterial pathogens, including gram-positive and gram-negative bacteria, and addresses **beta-lactamase producing strains**. *Corticosteroid* - While **intranasal corticosteroids** can be used as an adjunct to reduce inflammation in acute rhinosinusitis, they are **rarely sufficient as initial monotherapy** in cases highly suggestive of bacterial infection. - Oral corticosteroids are generally reserved for more severe or refractory cases due to systemic side effects. *Antihistamine* - Antihistamines are primarily used for **allergic rhinitis** to block histamine release and reduce symptoms like sneezing and rhinorrhea. - They are **ineffective against bacterial infections** and can paradoxically dry out mucous membranes, potentially hindering mucociliary clearance in sinusitis. *Topical decongestant* - Topical decongestants provide temporary relief by reducing **nasal congestion** but do not treat the underlying bacterial infection. - Prolonged use (more than 3-5 days) can lead to **rhinitis medicamentosa**, a rebound congestion.
Question 8: What is the primary cause of Common Variable Immunodeficiency (CVID)?
- A. Defective B cell function
- B. Absent B cells
- C. Reduced number of B cells
- D. Defective B cell differentiation (Correct Answer)
Explanation: ***Defective B cell differentiation*** - CVID is characterized primarily by a failure of **B cells** to differentiate into **plasma cells**, which are responsible for producing antibodies [1]. - This defective differentiation leads to **hypogammaglobulinemia**, or low levels of immunoglobulins [1]. *Absent B cells* - Complete absence of B cells is characteristic of severe combined immunodeficiency (SCID) or X-linked agammaglobulinemia (XLA), not CVID [1]. - In CVID, B cells are typically present, but they are dysfunctional. *Reduced number of B cells* - While some patients with CVID may have reduced B cell numbers, this is not the primary or defining defect. - The key issue is the inability of existing B cells to mature and produce antibodies effectively. *Defective B cell function* - While B cell function is indeed defective in CVID, the root cause of this malfunction is specifically the **failure of differentiation** into mature plasma cells. - The B cells are unable to perform their primary function of antibody production due to this arrest in their development.
Question 9: A 5-year-old male child presents to the clinic with a history of recurrent infections. On examination, he was found to have rashes. On routine blood investigation, a low platelet count was found. What will be the diagnosis?
- A. Wiskott-Aldrich syndrome (Correct Answer)
- B. Hyper-IgE syndrome
- C. Chediak-Higashi syndrome
- D. None of the options
Explanation: ***Wiskott-Aldrich syndrome*** - This syndrome is characterized by the classic triad of **recurrent infections** (due to immunodeficiency), **eczema-like rashes**, and **thrombocytopenia** (low platelet count), which perfectly matches the clinical presentation. - The underlying defect involves the WAS protein, crucial for **hematopoietic cell function**, leading to severe combined immunodeficiency. *Hyper-IgE syndrome* - While it features **recurrent infections** and **eczema**, it is primarily associated with **elevated IgE levels** and typically presents with a hallmark finding of **"cold" abscesses**. - **Low platelet count** is not a defining characteristic of Hyper-IgE syndrome. *Chediak-Higashi syndrome* - This syndrome involves **recurrent infections** and findings like **partial oculocutaneous albinism** and neurologic abnormalities. - While it can manifest with bleeding tendencies due to **platelet dysfunction**, the defining features of **eczema** and a consistently **low platelet count** as seen here are less prominent compared to Wiskott-Aldrich. *None of the options* - The presenting symptoms of **recurrent infections, rashes, and low platelet count** are highly specific for Wiskott-Aldrich syndrome, making this option incorrect.
Question 10: Mass Drug Administration is NOT routinely used as the primary strategy for:
- A. Vitamin A Deficiency
- B. Scabies (Correct Answer)
- C. Lymphatic Filariasis
- D. Worm infestation
Explanation: ***Scabies*** - While **mass drug administration with oral ivermectin** has shown effectiveness in specific endemic outbreak settings, MDA is generally **not the primary recommended strategy** for routine scabies control in most public health contexts. - Scabies control typically prioritizes **case finding, contact tracing, simultaneous household treatment, and environmental decontamination**—which are more complex to implement than standard MDA programs. - Unlike the other conditions listed, scabies lacks well-established **routine MDA programs** at the scale of national public health initiatives, making it the least suitable option for MDA among these choices. *Vitamin A Deficiency* - **Vitamin A supplementation** through MDA is a **highly effective and widely implemented** WHO-recommended strategy to combat Vitamin A deficiency in at-risk populations, particularly children under 5 years. - Regular mass supplementation helps prevent **xerophthalmia** and reduces morbidity and mortality from infectious diseases. - This is a cornerstone of routine public health programs globally. *Lymphatic Filariasis* - **Lymphatic filariasis** is a classic example where MDA with anti-filarial drugs like **diethylcarbamazine (DEC), albendazole,** or **ivermectin** is the cornerstone strategy for interrupting transmission. - MDA is the **primary WHO-recommended approach** to achieve elimination of lymphatic filariasis, with established national programs in endemic countries. *Worm infestation* - **Mass deworming programs** using drugs like **albendazole** or **mebendazole** represent highly effective and well-established forms of MDA for controlling **soil-transmitted helminth infections**. - These routine programs significantly reduce disease burden in school-aged children, improving nutritional status, growth, and learning outcomes.
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