Hepatitis Viruses Indian Medical PG Practice Questions and MCQs
Practice Indian Medical PG questions for Hepatitis Viruses. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Hepatitis Viruses Indian Medical PG Question 1: A 5 year old boy is detected to be HBsAg positive on two separate occasions during a screening program for hepatitis B. He is otherwise asymptomatic. Child was given three doses of recombinant hepatitis B vaccine at the age of 1 year. His mother was treated for chronic hepatitis B infection around the same time. The next relevant step for further investigating the child would be to –
- A. Repeat another course of Hepatitis B vaccine
- B. Repeat HBsAg
- C. Obtain HBeAg and anti-HBe levels (Correct Answer)
- D. Obtain anti HBs levels
Hepatitis Viruses Explanation: **Obtain HBeAg and anti–HBe levels**
- Given the child is **HBsAg positive** on two separate occasions and has a mother with **chronic hepatitis B**, evaluating **HBeAg** and **anti-HBe levels** is crucial to determine if the child is in a high replicative immune tolerant phase or an immune clearance phase.
- This information helps differentiate between persistent infection, risk of vertical transmission, and guides subsequent management, including the potential for antiviral therapy and monitoring requirements.
*Repeat another course of Hepatitis B vaccine*
- Repeating the vaccine is not indicated as the child is already **HBsAg positive**, indicating an active infection or carrier state, not a need for further immunization.
- Vaccination aims to prevent infection, but in this case, the child is already confirmed to be infected.
*Repeat HBsAg*
- The question states the child was detected to be **HBsAg positive on two separate occasions**, making another repeat unnecessary for confirmation of infection.
- The next step should aim to characterize the infection rather than re-confirm its presence.
*Obtain anti HBs levels*
- **Anti-HBs antibodies** indicate immunity from vaccination or resolved infection. Since the child is **HBsAg positive**, indicating active infection, anti-HBs levels would likely be negative or low and would not provide critical information about the current stage of infection.
- The focus should be on characterizing the active infection, not assessing protective immunity.
Hepatitis Viruses Indian Medical PG Question 2: Which of the following viruses is considered a defective virus that requires another virus for its replication?
- A. Hepatitis A virus (HAV)
- B. Hepatitis B virus (HBV)
- C. Hepatitis D virus (HDV) (Correct Answer)
- D. Hepatitis C virus (HCV)
Hepatitis Viruses Explanation: ***Hepatitis D virus (HDV)***
- **Hepatitis D virus (HDV)** is a unique RNA virus that is **defective** and requires the presence of **Hepatitis B virus (HBV)** and its surface antigen **(HBsAg)** for replication and assembly.
- HDV infection can occur as **co-infection** (simultaneous HBV and HDV) or **superinfection** (HDV infection in an existing HBV carrier), often leading to **more severe liver disease**.
- HDV is a **satellite virus** that cannot complete its life cycle independently.
*Incorrect: Hepatitis A virus (HAV)*
- **Hepatitis A virus (HAV)** is a **picornavirus** that causes acute hepatitis and **replicates independently** without the need for another helper virus.
- It is transmitted via the **fecal-oral route** and does **not cause chronic infection**.
*Incorrect: Hepatitis B virus (HBV)*
- **Hepatitis B virus (HBV)** is a **hepadnavirus** that **replicates independently** and produces its own viral envelopes.
- HBV is the **helper virus required for HDV replication**, but HBV itself does not require another virus to complete its life cycle.
*Incorrect: Hepatitis C virus (HCV)*
- **Hepatitis C virus (HCV)** is a **flavivirus** that can **replicate autonomously** and cause both acute and chronic hepatitis.
- It does **not require a helper virus** for its replication, unlike HDV.
Hepatitis Viruses Indian Medical PG Question 3: Which of the following is true about Hepatitis A virus?
- A. Causes chronic hepatitis
- B. Helps HDV replication
- C. Causes cirrhosis
- D. Common cause of hepatitis in children (Correct Answer)
Hepatitis Viruses Explanation: ***Common cause of hepatitis in children***
- **Hepatitis A virus (HAV)** infection is often acquired in childhood, particularly in areas with poor sanitation, and many infections are **asymptomatic** or mild in children [1].
- Due to their developing immune systems and often exposure in daycare or school settings, children are a highly susceptible population for HAV transmission [1].
*Causes cirrhosis*
- **HAV infection** is an **acute self-limiting illness** and typically does not lead to chronic liver disease or cirrhosis [1].
- **Cirrhosis** is primarily associated with chronic viral hepatitis (e.g., HBV, HCV), alcohol-related liver disease, or certain autoimmune conditions.
*Helps HDV replication*
- **Hepatitis D virus (HDV)** is a **defective virus** that requires the presence of **Hepatitis B virus (HBV)** surface antigen (HBsAg) for its replication and assembly [1].
- **HAV** has no role in the replication or pathogenesis of **HDV** [1].
*Causes chronic hepatitis*
- **HAV infection** results in an **acute inflammatory response** in the liver that resolves spontaneously in most cases [1].
- Unlike **HBV** and **HCV**, **HAV** does not establish a persistent infection and, therefore, does not cause chronic hepatitis [1].
Hepatitis Viruses Indian Medical PG Question 4: Which of the following markers in the blood is the most reliable indicator of recent hepatitis B infection?
- A. anti-HBe
- B. HBsAg
- C. IgG anti - HBs
- D. IgM anti - HBc (Correct Answer)
Hepatitis Viruses Explanation: ***IgM anti - HBc***
- **IgM anti-HBc** (antibody to hepatitis B core antigen) is the most reliable marker for **recent or acute hepatitis B infection**.
- It appears early in the infection and can be detected during the **window period** when HBsAg may have disappeared but anti-HBs has not yet appeared.
*anti-HBe*
- **Anti-HBe** (antibody to hepatitis B e-antigen) indicates **lower infectivity** and often suggests resolution of viral replication.
- It usually appears after HBeAg disappears and is not a primary marker of recent infection.
*HBsAg*
- **HBsAg** (hepatitis B surface antigen) indicates active **hepatitis B infection** (acute or chronic), but does not differentiate recent from long-standing infection on its own.
- While present in recent infection, IgM anti-HBc is more specific for **acute or recent onset**.
*IgG anti - HBs*
- **IgG anti-HBs** (antibody to hepatitis B surface antigen) indicates either **recovery from past infection** or **immunity due to vaccination**.
- It does not signify recent infection; rather, it suggests long-term immunity.
Hepatitis Viruses Indian Medical PG Question 5: Which of the following is the preferred treatment after birth for a baby of an HBsAg-positive mother?
- A. HepB immunoglobulin only
- B. HepB immunoglobulin + HepB immunization (Correct Answer)
- C. Only HepB immunization
- D. No active treatment required
Hepatitis Viruses Explanation: ***HepB immunoglobulin + HepB immunization***
- This combination provides both **passive immunity** (immunoglobulin) and **active immunity** (immunization) to the newborn.
- Administration within **12 hours of birth** is crucial to prevent perinatal transmission of hepatitis B from an HBsAg-positive mother.
*HepB immunoglobulin only*
- Provides only **temporary passive immunity** and does not induce long-lasting protection against hepatitis B.
- While it offers immediate protection, it eventually wanes, leaving the infant susceptible without active immunization.
*Only HepB immunization*
- Induces **active immunity**, but it takes time to develop, leaving a window of vulnerability postpartum.
- It would not provide immediate protection against the high risk of transmission from an HBsAg-positive mother.
*No active treatment required*
- This approach is incorrect and dangerous as infants of HBsAg-positive mothers are at a **very high risk of acquiring chronic hepatitis B infection**.
- Without intervention, there is a **70-90% chance of developing chronic hepatitis B**, which can lead to serious liver disease later in life.
Hepatitis Viruses Indian Medical PG Question 6: Chronic viral hepatitis is seen with all of the following viruses, except?
- A. HEV (Correct Answer)
- B. HCV
- C. HBV
- D. HDV
Hepatitis Viruses Explanation: ***HEV***
- While HEV can cause acute hepatitis, it **rarely progresses to chronic infection** in immunocompetent individuals.
- Chronic HEV infection is primarily seen in **immunocompromised patients**, such as organ transplant recipients.
*HCV*
- **Hepatitis C virus** is well-known for its high propensity to establish chronic infection, with about 75-85% of acutely infected individuals developing **chronic hepatitis** [1].
- Chronic HCV infection can lead to **cirrhosis**, liver failure, and hepatocellular carcinoma [1].
*HBV*
- **Hepatitis B virus** is a major cause of chronic hepatitis worldwide, especially when acquired perinatally or in early childhood [1].
- Approximately 5-10% of immunocompetent adults who acquire acute HBV infection progress to **chronic hepatitis** [1].
*HDV*
- **Hepatitis D virus** is a defective virus that requires co-infection with HBV to replicate; therefore, chronic HDV infection only occurs in individuals with chronic HBV.
- Co-infection or superinfection with HDV often **accelerates the progression of liver disease** to cirrhosis and liver failure.
Hepatitis Viruses Indian Medical PG Question 7: A dentist suffered from Hepatitis B infection 3 months back. His liver function tests are normal, but HBsAg remains positive and he is not allowed by the medical board to do surgical practice. He is:
- A. Inactive carrier
- B. Healthy carrier (Correct Answer)
- C. Convalescent carrier
- D. Paradoxical carrier
Hepatitis Viruses Explanation: ***Healthy carrier***
- A **healthy carrier** is an asymptomatic individual who harbors and can transmit the infectious agent while appearing clinically well with **normal liver function tests**.
- The dentist has **recovered clinically** (normal LFTs) but remains **HBsAg positive at 3 months**, making him infectious and capable of transmitting hepatitis B to patients during exposure-prone procedures.
- This is the **appropriate classification** for someone who is asymptomatic with persistent HBsAg beyond the acute phase but before the 6-month mark that defines chronic infection.
- The **practice restriction** is justified because healthy carriers pose a **transmission risk** in surgical and dental procedures involving blood exposure.
*Inactive carrier*
- An **inactive carrier** (or inactive chronic HBsAg carrier) is a more specific term for individuals with **chronic HBV infection** (HBsAg positive >6 months) who have minimal viral replication, normal ALT, and low/undetectable HBV DNA.
- At **3 months post-infection**, chronic carrier state cannot yet be definitively diagnosed as chronicity requires **persistence beyond 6 months**.
- While this patient may eventually become an inactive carrier, at 3 months the broader term "healthy carrier" is more appropriate.
*Convalescent carrier*
- A **convalescent carrier** harbors and sheds pathogens during the **immediate recovery phase** of acute illness, typically for **days to a few weeks**.
- At **3 months post-infection**, the patient is well beyond the convalescent period and has entered a **persistent carrier state** rather than active convalescence.
- This term is too time-limited to accurately describe someone with **persistent HBsAg at 3 months**.
*Paradoxical carrier*
- The term **paradoxical carrier** is **not a recognized classification** in hepatitis B epidemiology or standard infectious disease carrier state terminology.
- It does not appear in authoritative texts on **viral hepatitis** or carrier state definitions.
Hepatitis Viruses Indian Medical PG Question 8: Which one of the following is the correct sequence of appearance for the Hepatitis B virus serological markers?
- A. Anti-HBe, HBsAg, Anti-HBc
- B. HBeAg, Anti-HBe, Anti-HBc, HBsAg
- C. HBsAg, HBeAg, Anti-HBc, Anti-HBe (Correct Answer)
- D. Anti-HBc, HBsAg, Anti-HBe
Hepatitis Viruses Explanation: ***HBsAg, HBeAg, Anti-HBc, Anti-HBe***
- **HBsAg** (Hepatitis B surface antigen) is the first marker to appear in acute infection, indicating active viral replication.
- **HBeAg** (Hepatitis B e-antigen) appears shortly after HBsAg, correlating with high viral replication and infectivity. **Anti-HBc** (antibody to hepatitis B core antigen) is the next to appear, often during the window period. **Anti-HBe** (antibody to hepatitis B e-antigen) signals reduced viral replication and decreased infectivity, typically following the disappearance of HBeAg.
*Anti-HBe, HBsAg, Anti-HBc*
- This sequence is incorrect because **Anti-HBe** appears much later in the infection, typically after clearance of HBeAg, indicating reduced viral replication.
- **HBsAg** is the earliest indicator of active infection, not appearing after Anti-HBe.
*HBeAg, Anti-HBe, Anti-HBc, HBsAg*
- This sequence is incorrect as **HBeAg** and **Anti-HBe** do not typically appear before **HBsAg**, which is the initial marker of viral presence.
- The appearance of **Anti-HBe** before **HBsAg** is also not consistent with the natural history of Hepatitis B infection.
*Anti-HBc, HBsAg, Anti-HBe*
- This sequence is incorrect because **Anti-HBc** usually appears earlier than Anti-HBe, and while it can be detected relatively early, **HBsAg** is the first antigen to be detectable.
- The appearance of **Anti-HBe** is a sign of decreasing viral activity and generally appears later than both HBsAg and Anti-HBc.
Hepatitis Viruses Indian Medical PG Question 9: All are transmitted by blood except -
- A. Parvovirus B-19
- B. Cytomegalovirus
- C. Hepatitis G
- D. Epstein-Barr virus (Correct Answer)
Hepatitis Viruses Explanation: **Epstein-Barr virus**
- While Epstein-Barr virus can be detected in blood, its primary mode of transmission is through **saliva** (e.g., kissing, sharing utensils), leading to infectious mononucleosis.
- **Blood transfusion transmission** of EBV is rare and not considered a major route of spread in otherwise healthy individuals.
*Parvovirus B-19*
- **Parvovirus B-19** is well-known to be transmitted via **blood products** and can cause transient aplastic crisis, especially in patients with chronic hemolytic anemias.
- It can also be transmitted via **respiratory droplets** and vertically from mother to fetus.
*Cytomegalovirus*
- **Cytomegalovirus (CMV)** is frequently transmitted through **blood transfusions**, especially to immunocompromised patients.
- It can also be transmitted through other bodily fluids, organ transplantation, and congenitally.
*Hepatitis G*
- **Hepatitis G virus (HGV)**, now renamed **GB virus C (GBV-C)**, is primarily transmitted through **blood** and blood products.
- It is often found as a co-infection with hepatitis C virus but its pathogenicity remains controversial.
Hepatitis Viruses Indian Medical PG Question 10: Which gene of the hepatitis B virus has the longest coding sequence?
- A. P gene (Correct Answer)
- B. X gene
- C. S gene
- D. C gene
Hepatitis Viruses Explanation: ***P gene***
- The **P gene** (polymerase gene) encodes the viral **reverse transcriptase**, which is crucial for replicating the HBV genome.
- This enzyme is very large and complex, requiring the **longest coding sequence** to accommodate all its functional domains.
*X gene*
- The **X gene** encodes the **HBx protein**, which is a transcriptional transactivator and plays a role in hepatocarcinogenesis.
- It has a relatively **short coding sequence** compared to the P gene.
*S gene*
- The **S gene** encodes the **surface antigens (HBsAg)**, which are involved in viral entry and immune evasion.
- It has a **shorter coding sequence** than the P gene, as it primarily codes for structural proteins.
*C gene*
- The **C gene** encodes the **core protein (HBcAg)**, which forms the viral nucleocapsid, and the **HBeAg**.
- Its coding sequence is also **shorter** than that of the P gene, reflecting its role in structural and regulatory functions.
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