I now have excellent content from Jawetz, Sherris, Robbins, and Goldman-Cecil to craft 10 high-quality NEET PG/INICET-style MCQs on HSV 1 & 2. Let me compile them now.

Here are 10 HSV-1 & HSV-2 Microbiology MCQs modeled on NEET PG and INICET PYQ patterns, drawn from Jawetz Melnick & Adelberg's Medical Microbiology, Sherris & Ryan's Medical Microbiology, and Robbins Pathology:

A) Tzanck smear of CSF B) Serum IgM antibody for HSV C) PCR for HSV DNA in cerebrospinal fluid D) Brain biopsy

Explanation: HSV encephalitis (predominantly caused by HSV-1 in adults) classically involves hemorrhagic necrosis of the temporal lobe. PCR for HSV DNA in CSF is the gold standard diagnostic test - it is sensitive, specific, rapid, and non-invasive. Brain biopsy, though historically used, is no longer the first-line approach. Tzanck smear is used for skin vesicles, not CSF. Serum IgM is unreliable for CNS disease.

A) Acyclovir binds specifically to receptors only on HSV-infected cell surface B) Acyclovir is phosphorylated by a virus-encoded thymidine kinase only within HSV-infected cells C) Acyclovir selectively inhibits RNA polymerase in the HSV virion D) Acyclovir blocks the HSV matrix protein, preventing release of progeny virus

Explanation: Acyclovir (acycloguanosine) is a prodrug activated by HSV-encoded thymidine kinase (TK). This phosphorylation only occurs efficiently inside HSV-infected cells. The resulting acyclovir triphosphate then competitively inhibits viral DNA polymerase. Host cell kinases cannot efficiently phosphorylate acyclovir - this selectivity is the basis of its safety profile. Resistance develops when HSV mutants lose or alter their thymidine kinase.

A) HSV-1 causes lesions above the umbilicus more frequently than HSV-2 B) Infection by HSV-1 is not associated with any tumors in humans C) Antiserum to HSV-1 neutralizes HSV-1 much more effectively than HSV-2 D) HSV-1 causes frequent recurrences, while HSV-2 infection rarely recurs

Explanation: This is false - it is actually HSV-2 that has a higher recurrence rate for genital disease, while HSV-1 genital infections recur less frequently. HSV-1 does recur frequently as oral/labial herpes, but HSV-2 recurs far more often in the genital region. The other statements are true: HSV-1 predominates in orofacial lesions (above umbilicus), type-specific antibodies are largely non-cross-reactive, and HSV has not been definitively linked to human tumors (unlike EBV or HHV-8).

A) Molluscum contagiosum virus B) Coxsackievirus C) Variola major D) Varicella-zoster virus

Explanation: The Tzanck smear showing multinucleated giant cells (Tzanck cells) is positive for both HSV (type 1 and 2) AND varicella-zoster virus (VZV) - all members of the alpha-herpesvirus subfamily. Among the options listed, VZV is the correct answer. Molluscum contagiosum shows Henderson-Paterson bodies (molluscum bodies). Coxsackievirus and variola do not produce multinucleated giant cells on Tzanck smear.

A) Negri body B) Cowdry type A inclusion C) Henderson-Paterson body D) Torres body

Explanation: HSV infection produces Cowdry type A intranuclear inclusion bodies - light purple, homogeneous structures surrounded by a clear halo. Infected cells also fuse to form multinucleated syncytia. Negri bodies are seen in rabies (cytoplasmic). Henderson-Paterson bodies occur in molluscum contagiosum. Torres bodies are seen in yellow fever. The Cowdry type A body is classic for both HSV and CMV.

A) Superior cervical ganglion B) Gasserian (trigeminal) ganglion C) Dorsal root ganglion at T1-T2 D) Sacral (S2-S3) dorsal root ganglia

Explanation: After primary orofacial infection, HSV-1 travels retrogradely along sensory neurons to establish latency in the trigeminal (Gasserian) ganglion. HSV-2 genital infection establishes latency in the sacral (S2-S3) dorsal root ganglia. The key concept is that latency site is determined by the location of primary infection, not the HSV type. During latency, only the Latency-Associated Transcript (LAT) is expressed - no viral proteins are made, so antiviral drugs cannot eradicate the latent virus.

A) Risk is equal whether the mother has primary or recurrent infection B) HSV-1 is more likely than HSV-2 to cause neonatal herpes C) Transmission occurs mainly during passage through the birth canal D) Virus cannot be transmitted in the absence of visible lesions

Explanation: Approximately 85% of neonatal HSV infections are acquired perinatally during passage through an infected birth canal. The risk of transmission is 10 times higher with primary maternal infection than with recurrent disease (because primary infection has higher viral load and no maternal antibodies). HSV-2 accounts for ~75% of neonatal herpes cases, more than HSV-1. Importantly, subclinical shedding (without visible lesions) can also transmit the virus, making option D false.

A) Exogenous stimuli such as UV light and stress can trigger reactivation B) Antiviral antibody is NOT demonstrable in the sera of latently infected individuals C) Reactivation is more common in immunocompromised patients D) Virus can be recovered from latently infected cells by cocultivation with susceptible cells

Explanation: This statement is FALSE and therefore the correct answer. Individuals with latent HSV DO have demonstrable antiviral antibodies in their serum - the antibody persists lifelong after primary infection. During latency: no viral proteins are expressed (only LAT is transcribed); reactivation occurs with UV light, fever, emotional stress, immunosuppression; and virus can indeed be recovered by cocultivation. Antiviral antibodies do not prevent latency or reactivation.

A) HSV-2; frontal lobe B) HSV-1; temporal lobe C) HSV-2; parietal lobe D) HSV-1; occipital lobe

Explanation: In adults and older children, HSV encephalitis is caused predominantly by HSV-1 (>90% of cases). It is the most common cause of fatal sporadic encephalitis. The hallmark is hemorrhagic necrosis of the temporal lobe (and often the orbitofrontal cortex). MRI shows FLAIR/T2 hyperintensity in the temporal lobes. Treatment is IV acyclovir initiated immediately - delay worsens outcome. Note: HSV-2 is more commonly implicated in neonatal encephalitis and aseptic meningitis in adults.

A) The rash is not contagious between wrestlers B) The causative agent is herpes simplex virus type 1 C) The causative agent is varicella-zoster virus D) Lesions typically last 1 month or longer

Explanation: Herpes gladiatorum is caused by HSV-1 and results from direct skin-to-skin contact during wrestling (via abrasions). It is highly contagious among wrestlers. Lesions are vesicular and typically resolve in 1-2 weeks (not 1 month). VZV is not the cause. There is no approved vaccine for HSV-1 prevention. This is a classic NEET PG scenario testing applied microbiology knowledge.

I now have comprehensive material from multiple authoritative textbooks. Let me compile the 10 EBV MCQs.

Here are 10 EBV (Epstein-Barr Virus) Microbiology MCQs modeled on NEET PG and INICET PYQ patterns, sourced from Jawetz, Medical Microbiology 9e, Sherris & Ryan, Robbins Pathology, and Harrison's Principles:

A) CD4 B) CD21 (CR2) C) CD3 D) CD8

Explanation: EBV enters B lymphocytes by binding to CD21 (also called CR2 - Complement Receptor 2) on the B cell surface. CD21 is the same receptor that binds the C3d fragment of complement. This interaction between EBV glycoprotein gp350/220 and CD21 is the primary attachment mechanism. EBV also infects some nasopharyngeal epithelial cells. This is a high-frequency NEET PG/INICET topic.

A) Anaphylactic shock B) Pruritic maculopapular rash in 15-30% of patients C) Agranulocytosis D) Steven-Johnson syndrome

Explanation: Administration of ampicillin (or amoxicillin) to patients with EBV infectious mononucleosis causes a characteristic non-allergic, pruritic maculopapular rash in 15-30% of patients. This is NOT a true penicillin allergy - it is a drug-virus interaction unique to EBV IM. This rash disappears after the drug is stopped and EBV infection resolves. Ampicillin/amoxicillin are therefore contraindicated in suspected IM. This is a classic PYQ scenario.

A) Guinea pig kidney cells B) Sheep, horse, and bovine red blood cells C) Human group O red blood cells D) Ox red blood cells only

Explanation: The Paul-Bunnell heterophile antibody in EBV infectious mononucleosis is an IgM antibody that agglutinates sheep, horse, and bovine erythrocytes. Crucially, this antibody is NOT absorbed by guinea pig kidney cells (which distinguishes it from Forssman antibodies - a key differential). The Monospot test uses horse red blood cells for rapid detection. The heterophile antibody appears by end of week 1, peaks at week 2-3, and persists for several months.

A) VCA-IgG positive, EBNA positive, VCA-IgM negative B) All markers negative C) VCA-IgM positive, VCA-IgG positive, EBNA negative D) VCA-IgG positive, EBNA positive, Early Antigen positive

Explanation: During acute primary EBV infection: VCA-IgM is positive (appears first), VCA-IgG is positive, Early Antigen (EA) may be present, but EBNA is ABSENT. The key diagnostic point is that anti-EBNA antibody appears only during convalescence (after lysis of infected cells by T cells) and is therefore absent in acute disease. The presence of both VCA and EBNA antibodies indicates PAST infection. EBNA absence = acute/recent infection; EBNA presence = past infection.

A) Infected B lymphocytes B) Activated cytotoxic T lymphocytes (CD8+ T cells) C) Monocytes D) NK cells

Explanation: This is a classic NEET PG trick question. Although EBV infects B lymphocytes (via CD21), the atypical lymphocytes (Downey cells) seen in the peripheral blood smear are actually activated CD8+ cytotoxic T lymphocytes responding to EBV-infected B cells. They are large, with abundant pale blue cytoplasm and irregular indented nucleus. They constitute >10% of WBCs in IM, with lymphocytosis reaching 60-70% of total WBC count. The T cells are the reactive cells; B cells are the infected cells.

A) Burkitt lymphoma - sub-Saharan Africa, jaw mass in children B) Nasopharyngeal carcinoma - endemic in Southeast Asia/China C) Hodgkin lymphoma (mixed cellularity subtype) - Reed-Sternberg cells D) Kaposi sarcoma - immunocompromised patients

Explanation: Kaposi sarcoma is caused by HHV-8 (Human Herpesvirus 8, also called Kaposi Sarcoma Herpesvirus - KSHV), NOT EBV. EBV-associated malignancies include: Burkitt lymphoma (endemic African type - jaw), Hodgkin lymphoma (mixed cellularity), nasopharyngeal carcinoma (epithelial, endemic in East/Southeast Asia), post-transplant lymphoproliferative disorders, primary CNS lymphoma in AIDS, and gastric carcinoma. This is a high-yield NEET PG discriminator.

A) t(9;22) - Philadelphia chromosome B) t(8;14) - c-MYC/IgH translocation C) t(14;18) - bcl-2/IgH translocation D) t(15;17) - PML-RARα translocation

Explanation: EBV immortalizes B cells and facilitates survival of cells that undergo chromosomal translocation placing the c-MYC oncogene (chromosome 8) adjacent to an active immunoglobulin gene promoter - most commonly the heavy chain locus on chromosome 14 [t(8;14)], less commonly lambda light chain [t(8;22)] or kappa light chain [t(2;8)]. This causes dysregulated overexpression of c-MYC, a key transcription factor driving cell proliferation. t(9;22) = CML; t(14;18) = follicular lymphoma; t(15;17) = APL.

A) Candida albicans B) EBV (Hairy oral leukoplakia) C) HPV (oral wart) D) CMV

Explanation: Hairy oral leukoplakia (HOL) is caused by productive EBV infection of epithelial cells of the tongue. It presents as white, hairy or corrugated plaques on the lateral tongue that CANNOT be scraped off (unlike oral candidiasis which can). It is an opportunistic manifestation occurring almost exclusively in immunocompromised patients, especially those with HIV/AIDS, and is considered an AIDS-defining condition. Candidal plaques are scrapable and leave an erythematous base - key distinguishing feature.

A) EBV establishes latency in the trigeminal ganglion B) EBV establishes latency in memory B lymphocytes, with EBNA-1 retaining the viral genome C) No viral proteins are expressed at all during latency D) Antiviral antibodies are absent during EBV latency

Explanation: After primary infection, EBV establishes lifelong latency in circulating memory B lymphocytes. Unlike HSV (which establishes latency in neurons), EBV's latent reservoir is the B cell pool. During latency in memory B cells, EBNA-1 is the key protein expressed - it anchors the viral episome to host chromosomes during cell division, ensuring the viral genome is retained in daughter cells. EBV latency programs (I, II, III) correlate with different cancers. Antibodies to VCA and EBNA persist lifelong.

A) Increased risk of secondary bacterial pneumonia B) Spontaneous splenic rupture C) Triggering autoimmune hemolytic anemia D) Spread of infection to teammates

Explanation: Splenomegaly is a characteristic finding in EBV infectious mononucleosis (occurs in ~50% of cases). Contact sports are contraindicated until the spleen returns to normal size because of the risk of traumatic or spontaneous splenic rupture - a potentially life-threatening surgical emergency. Return to contact sports is generally deferred for at least 3-4 weeks after symptom onset (or until splenomegaly resolves on imaging). This is a frequently tested clinical application in NEET PG/INICET.