Varicella-Zoster Virus Infections Indian Medical PG Practice Questions and MCQs
Practice Indian Medical PG questions for Varicella-Zoster Virus Infections. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Varicella-Zoster Virus Infections Indian Medical PG Question 1: A patient presents with painful vesicles in the ear and tongue. He also complains of facial weakness and hearing loss. What is the diagnosis?
- A. Fungal infection
- B. Chicken pox
- C. Ramsay hunt syndrome (Correct Answer)
- D. None of the options
Varicella-Zoster Virus Infections Explanation: ***Ramsay hunt syndrome***
- This syndrome is characterized by a **herpes zoster oticus** (shingles affecting the ear) combined with **facial nerve palsy**, leading to **facial weakness** [1], [2].
- Symptoms include painful vesicular rash in the external auditory canal (ear), sometimes extending to the tongue or soft palate, **ipsilateral facial paralysis**, and often **hearing loss** or **vertigo** [1].
*Fungal infection*
- Fungal infections in the ear (otomycosis) typically cause **itching**, discharge, and pain, but rarely present with **vesicles**, **facial weakness**, or widespread vesicular lesions on the tongue.
- They are not associated with nerve palsies like **facial weakness** and **hearing loss** in the manner seen in Ramsay Hunt syndrome.
*Chicken pox*
- **Chickenpox (varicella)** is a generalized vesicular rash that is typically widespread over the body [3], while Ramsay Hunt syndrome involves **localized vesicular lesions** with associated cranial nerve dysfunction.
- While caused by the same virus (**Varicella-Zoster Virus**), chickenpox is the primary infection whereas Ramsay Hunt syndrome is a reactivation [1], [3].
*None of the options*
- This option is incorrect as Ramsay Hunt syndrome perfectly matches the described clinical presentation of **painful vesicles** in the ear and tongue, **facial weakness**, and **hearing loss**.
Varicella-Zoster Virus Infections Indian Medical PG Question 2: Herpes zoster in geniculate ganglion causes?
- A. Melkersson-Rosenthal syndrome
- B. Ramsay Hunt syndrome (Correct Answer)
- C. Bell's palsy
- D. Ophthalmic zoster
Varicella-Zoster Virus Infections Explanation: ***Ramsay Hunt syndrome***
- This syndrome is caused by the **reactivation of varicella-zoster virus (VZV)** within the **geniculate ganglion**, leading to inflammation of the facial nerve (cranial nerve VII).
- Key features include **ipsilateral facial paralysis**, **ear pain**, and a **vesicular rash in the external auditory canal** or on the auricle.
*Melkersson-Rosenthal syndrome*
- This is a rare neurological disorder characterized by a triad of symptoms: **recurrent facial paralysis**, **persistent orofacial swelling**, and **fissured tongue**.
- It is not directly related to viral infection or the geniculate ganglion.
*Bell's palsy*
- Bell's palsy is an **idiopathic facial paralysis** that results from inflammation of the facial nerve, but the exact cause is unknown and it does not involve a vesicular rash.
- While it shares some symptoms with Ramsay Hunt syndrome, the **absence of vesicles** distinguishes it.
*Ophthalmic zoster*
- Ophthalmic zoster occurs when VZV reactivates in the **trigeminal ganglion** (cranial nerve V), specifically affecting the ophthalmic division.
- It presents with a **vesicular rash on the forehead, eyelids, and nose** (Hutchinson's sign), and can lead to serious ocular complications, but does not involve the facial nerve directly.
Varicella-Zoster Virus Infections Indian Medical PG Question 3: A 25-year-old male presents with a cluster of vesicles along the dermatome on his chest and back. He complains of burning pain in the same area. What is the most likely diagnosis?
- A. Herpes zoster (Correct Answer)
- B. Contact dermatitis
- C. Herpes simplex
- D. Impetigo
Varicella-Zoster Virus Infections Explanation: ***Herpes zoster***
- The classic presentation of **vesicular rash along a dermatome** with **burning pain** is highly characteristic of herpes zoster (shingles).
- This condition is caused by the **reactivation of the varicella-zoster virus (VZV)**, which lies dormant in sensory ganglia.
*Contact dermatitis*
- This condition typically presents as an **itchy, erythematous rash** that appears after contact with an allergen or irritant.
- While vesicles can be present, the rash is usually not strictly confined to a single dermatome and **burning pain is less common** than itching.
*Herpes simplex*
- Herpes simplex virus (HSV) typically causes **localized clusters of vesicles** on mucosal surfaces (e.g., oral, genital) or skin.
- It does not usually present with a **dermatomal distribution** on the trunk as described in the vignette.
*Impetigo*
- Impetigo is a **bacterial skin infection** characterized by **honey-crusted lesions** or pustules.
- While it can involve vesicles, it does not follow a **dermatomal pattern** and is caused by bacteria, not a viral reactivation.
Varicella-Zoster Virus Infections Indian Medical PG Question 4: The Tzanck test is positive in the following conditions, except:
- A. Herpes Simplex
- B. Varicella
- C. EBV (Correct Answer)
- D. Herpes Zoster
Varicella-Zoster Virus Infections Explanation: ***EBV***
- The **Tzanck test** is used to detect **multinucleated giant cells** and **acantholytic cells**, which are characteristic cytopathic effects of **herpes group viruses** on epithelial cells.
- **Epstein-Barr Virus (EBV)** is a herpesvirus that causes infectious mononucleosis and is associated with various cancers, but it does not typically cause mucocutaneous lesions with the classic cytopathic changes detectable by a Tzanck test.
*Herpes Zoster*
- **Herpes Zoster**, caused by the **varicella-zoster virus (VZV)**, is a herpesvirus that causes **shingles** and produces characteristic **vesicular lesions** in a dermatomal distribution.
- The **Tzanck test** will be positive in herpes zoster due to the presence of **multinucleated giant cells** and **acantholytic cells** in the vesicular fluid or scrapings.
*Herpes Simplex*
- **Herpes Simplex Virus (HSV)** causes **cold sores**, **genital herpes**, and other mucocutaneous lesions characterized by **vesicles** and **ulcers**.
- A positive **Tzanck test** in HSV infections reveals **multinucleated giant cells** and **intranuclear inclusions**, confirming viral cytopathic effects.
*Varicella*
- **Varicella**, also known as **chickenpox**, is caused by the **varicella-zoster virus (VZV)** and manifests as widespread **vesicular rash**.
- The **Tzanck test** is positive in varicella infections, showing the presence of **multinucleated giant cells** and **acantholysis** within the vesicular lesions.
Varicella-Zoster Virus Infections Indian Medical PG Question 5: A 60-year-old patient presents with unilateral vesicular lesions in a dermatomal distribution on the torso. The lesions are painful and appeared over the past 2-3 days, progressing from erythematous patches to fluid-filled vesicles. The patient reports prodromal burning and tingling sensation in the affected area. Which of the following is the most likely diagnosis?
- A. Herpes zoster infection (Correct Answer)
- B. Irritant contact dermatitis
- C. Allergic contact dermatitis
- D. Herpes Simplex Infection
Varicella-Zoster Virus Infections Explanation: ***Herpes zoster infection***
- The patient's presentation of **unilateral vesicular lesions** in a **dermatomal distribution**, accompanied by severe pain and a **prodromal burning and tingling sensation**, is classic for herpes zoster (shingles).
- Herpes zoster results from the **reactivation of latent varicella-zoster virus (VZV)** in a sensory ganglion, leading to painful rash along the affected nerve path.
*Irritant contact dermatitis*
- This condition involves inflammation due to direct contact with an irritating substance, often presenting with **eczematous lesions**, redness, itching, and sometimes vesicles.
- However, it typically lacks the characteristic **dermatomal distribution** and severe neuropathic pain seen in herpes zoster.
*Allergic contact dermatitis*
- Allergic contact dermatitis is an immune-mediated reaction to an allergen, causing intensely pruritic, erythematous, and often **vesicular or bullous eruptions** that tend to spread beyond the initial contact area over time.
- While it can cause vesicles, it does not follow a **dermatomal pattern** and is usually very itchy, rather than primarily painful and burning, with a distinct prodrome.
*Herpes Simplex Infection*
- Herpes simplex virus (HSV) infections also cause **vesicular lesions** but typically present as clusters of vesicles on an **erythematous base** in a localized area, often around the mouth (cold sores) or genitals.
- Unlike herpes zoster, HSV lesions are usually **recurrent** in the same small area and typically do not exhibit a widespread, **unilateral dermatomal pattern** or the associated severe, persistent neuropathic pain.
Varicella-Zoster Virus Infections Indian Medical PG Question 6: After a renal transplant, what is the most common opportunistic infection?
- A. Varicella Zoster Virus (VZV)
- B. Coxsackie Virus
- C. Epstein-Barr Virus (EBV)
- D. Cytomegalovirus (CMV) (Correct Answer)
Varicella-Zoster Virus Infections Explanation: ***Cytomegalovirus (CMV)***
- **CMV** is the most common opportunistic infection after renal transplantation, particularly in the first 6 months due to immunosuppression [1].
- It can cause a range of clinical syndromes, including **fever**, **leukopenia**, **gastroenteritis**, **pneumonitis**, and **hepatitis**, and can also have indirect effects that increase the risk of graft rejection.
*Varicella Zoster Virus (VZV)*
- While VZV can cause opportunistic infections in transplant recipients (e.g., **shingles**), it is less common than CMV [1].
- VZV typically occurs later post-transplant and is characterized by a **vesicular rash** in a dermatomal distribution.
*Coxsackie Virus*
- **Coxsackie virus** infections are less frequently reported as significant opportunistic infections in renal transplant recipients compared to other viral pathogens.
- They are generally associated with hand-foot-and-mouth disease, herpangina, or myocarditis, which are not the most common post-transplant complications.
*Epstein-Barr Virus (EBV)*
- **EBV** can cause post-transplant lymphoproliferative disorder (PTLD), which is a serious complication, but EBV infection itself is not the most common opportunistic infection overall [1].
- PTLD is more common in the first year after transplant and often presents with **lymphadenopathy**, **fever**, or **graft dysfunction**.
Varicella-Zoster Virus Infections Indian Medical PG Question 7: What type of cell are Tzanck cells commonly associated with in skin conditions?
- A. Keratinocyte (Correct Answer)
- B. Neutrophil
- C. Lymphocyte
- D. Fibroblast
Varicella-Zoster Virus Infections Explanation: ***Keratinocyte***
- **Tzanck cells** are **acantholytic keratinocytes** characterized by loss of intercellular connections, resulting in rounded cells with **large nuclei** and **perinuclear halos**.
- They are classically seen in **pemphigus vulgaris** and other acantholytic disorders on **Tzanck smear** preparation.
- The Tzanck smear is a simple bedside diagnostic test where the base of a blister is scraped and examined microscopically after staining.
*Fibroblast*
- **Fibroblasts** are mesenchymal cells in the **dermis** that produce **collagen** and extracellular matrix components.
- They are not epithelial cells and do not undergo acantholysis to form Tzanck cells.
*Neutrophil*
- **Neutrophils** are polymorphonuclear leukocytes involved in acute inflammatory responses and fighting bacterial infections.
- They may infiltrate skin lesions but do not transform into Tzanck cells, which are specifically altered keratinocytes.
*Lymphocyte*
- **Lymphocytes** (T cells and B cells) are immune cells involved in **adaptive immunity**.
- They are not the cell type from which Tzanck cells originate; Tzanck cells are acantholytic epidermal keratinocytes.
Varicella-Zoster Virus Infections Indian Medical PG Question 8: A 40-year-old man underwent kidney transplantation. Two months after transplantation, he developed fever and features suggestive of bilateral diffuse interstitial pneumonia. Which of the following is the most likely etiologic agent?
- A. Varicella zoster virus
- B. Cytomegalovirus (Correct Answer)
- C. Herpes simplex virus
- D. Epstein-barr virus
Varicella-Zoster Virus Infections Explanation: ***Cytomegalovirus***
- **CMV infection** is very common and a frequent opportunistic infection in **immunosuppressed solid organ transplant recipients**, especially within the first few months post-transplant [1].
- **CMV pneumonitis**, characterized by diffuse interstitial pneumonia and fever, is a classic presentation of CMV disease in this patient population [1].
*Varicella zoster virus*
- While VZV can cause serious infections in immunosuppressed individuals, **pneumonia due to VZV** is typically part of a disseminated disease and less common than CMV pneumonitis in transplant recipients.
- **Cutaneous vesicular lesions** would usually precede or accompany VZV pneumonia, which are not mentioned here.
*Herpes simplex virus*
- HSV can cause severe mucocutaneous infections in immunocompromised patients, but **HSV pneumonia** is rare and usually manifests as tracheobronchitis or a focal necrotizing pneumonia, not typically diffuse interstitial.
- **Esophagitis or encephalitis** are more common serious manifestations of HSV in this population than primary pneumonitis.
*Epstein-barr virus*
- EBV is primarily associated with **post-transplant lymphoproliferative disorder (PTLD)** in transplant recipients, which can involve the lungs.
- While PTLD can manifest with fever and pulmonary infiltrates, **diffuse interstitial pneumonia** solely due to primary EBV infection is less characteristic than for CMV.
Varicella-Zoster Virus Infections Indian Medical PG Question 9: Genital warts are caused by which virus?
- A. Herpes simplex
- B. Cytomegalovirus
- C. Varicella zoster
- D. Human Papillomavirus (Correct Answer)
Varicella-Zoster Virus Infections Explanation: ***Human Papillomavirus***
- **HPV types 6 and 11** are the most common causes of **genital warts (condyloma acuminata)**.
- HPV is a **DNA virus** that infects epithelial cells and can cause benign proliferative lesions.
*Herpes simplex*
- **Herpes simplex virus (HSV)** causes **genital herpes**, characterized by painful vesicles and ulcers, not warts.
- HSV is a **DNA virus** that primarily infects mucocutaneous sites and establishes latency in sensory ganglia.
*Cytomegalovirus*
- **Cytomegalovirus (CMV)** is a **beta-herpesvirus** that causes a wide range of clinical syndromes, especially in immunocompromised individuals, but does not cause genital warts.
- CMV infection can manifest as mononucleosis-like syndrome, retinitis, colitis, or pneumonitis.
*Varicella zoster*
- **Varicella zoster virus (VZV)** causes **chickenpox** (varicella) and **shingles** (herpes zoster), characterized by vesicular rashes, not genital warts.
- VZV is an **alpha-herpesvirus** that remains latent in dorsal root ganglia after primary infection.
Varicella-Zoster Virus Infections Indian Medical PG Question 10: Congenital varicella infection causes all except:
- A. Macrocephaly (Correct Answer)
- B. Cortical atrophy
- C. Cicatrix
- D. Limb hypoplasia
Varicella-Zoster Virus Infections Explanation: ***Macrocephaly***
- **Macrocephaly** is generally not a direct consequence of congenital varicella infection; rather, **microcephaly** due to brain damage is more commonly observed.
- Congenital varicella typically causes destructive lesions leading to tissue loss, not increased head circumference.
*Cortical atrophy*
- **Cortical atrophy** results from the destructive effects of the virus on the developing brain, leading to **neuronal loss** and reduced brain volume.
- This can manifest as **microcephaly**, an indirect but common finding associated with congenital varicella.
*Cicatrix*
- **Cicatrix** (zig-zag scarring) is a classic dermatological manifestation of congenital varicella, resulting from the virus's impact on developing skin.
- These characteristic **skin lesions** are one of the most identifiable features of the syndrome.
*Limb hypoplasia*
- **Limb hypoplasia**, involving underdeveloped limbs, is a hallmark feature of congenital varicella, often due to **viral damage** to limb buds and associated neural structures.
- This can lead to **bone shortening** and muscle atrophy in affected limbs.
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