Advanced Virology: Clinical Manifestations and Diagnostic Insights

1. A pregnant female developed fulminant hepatitis and died. Liver biopsy shows patchy necrosis. She most likely got the virus from?

Mosquito bites

Skin-to-skin contact

Airborne droplets

The correct answer is from water or food because HEV is transmitted fecal-orally. Airborne droplets, mosquito bites, and skin-to-skin contact are not known routes of transmission for HEV.

Explanation

The correct answer is from water or food because HEV is transmitted fecal-orally. Airborne droplets, mosquito bites, and skin-to-skin contact are not known routes of transmission for HEV.

2. Why do we still have cases of post-transfusion hepatitis?

Post-transfusion hepatitis is a completely eradicated disease.

Post-transfusion hepatitis is caused by bacterial infections.

Post-transfusion hepatitis only occurs in patients with a genetic predisposition.

Post-transfusion hepatitis can still occur due to the window period during which antiviral antibodies may not be detectable, allowing infections to go undetected initially.

Explanation

Post-transfusion hepatitis can still occur due to the window period during which antiviral antibodies may not be detectable, allowing infections to go undetected initially.

3. Which DNA virus is the most likely cause of severe pneumonia in patients with underlying lung disease or who are smokers?

Influenza virus

Parainfluenza virus

Hantavirus

4. What is a correct interpretation of the hepatitis panel?

A

B

C

D

The correct interpretation of the hepatitis panel provided indicates a chronic infection with HBV based on the presence of HBsAg-positive, Total anti-HBcAg-positive, and HBeAg-positive. Acute infection (option A) would typically show different markers, while coinfection with HBV and HAV (option C) would present with additional markers for HAV. Recovery from HBV infection (option D) would show different antibody profiles.

Explanation

The correct interpretation of the hepatitis panel provided indicates a chronic infection with HBV based on the presence of HBsAg-positive, Total anti-HBcAg-positive, and HBeAg-positive. Acute infection (option A) would typically show different markers, while coinfection with HBV and HAV (option C) would present with additional markers for HAV. Recovery from HBV infection (option D) would show different antibody profiles.

5. How are human papilloma virus type 4 warts spread?

Respiratory droplet spread

Fecal-oral

Animal bite

6. In the eastern United States, what is the most common reservoir of the disease that causes disorientation, confusion, hallucinations, and excessive salivation in a patient presenting to the emergency department?

Squirrel

Raccoon

Bat

Possum

The correct answer is raccoon. Raccoons are the most common reservoir of rabies in the eastern United States, with transmission usually occurring through bites or scratches from infected animals. Bats can also carry rabies, but raccoons are the primary source in this region.

Explanation

The correct answer is raccoon. Raccoons are the most common reservoir of rabies in the eastern United States, with transmission usually occurring through bites or scratches from infected animals. Bats can also carry rabies, but raccoons are the primary source in this region.

7. Infection of appropriate cells with a composite virus made up of Coxsackie virus capsid components and poliovirus RNA would yield progeny which would

A. Have the host cell range of Coxsackie virus

E

B. Also be composite viruses

C. Show phenotypic mixing

The correct answer is E because the progeny resulting from the infection would react with Sabin-vaccine-induced antibodies due to the presence of poliovirus RNA components in the composite virus.

Explanation

The correct answer is E because the progeny resulting from the infection would react with Sabin-vaccine-induced antibodies due to the presence of poliovirus RNA components in the composite virus.

8. What is the status of the ER resident who was accidentally stuck with a needle from a hepatitis B virus-positive patient?

Immune

Chronic infection

Fulminant infection

The presence of HBsAg, HBcAb, and HBeAg are all indicators of an acute infection at 2 months postexposure.

Explanation

The presence of HBsAg, HBcAb, and HBeAg are all indicators of an acute infection at 2 months postexposure.

9. A 6-year-old girl presents to the emergency department with a fever and a lacy body rash. Her mother says that yesterday the rash was only on her face, but by this morning, had spread to her trunk and extremities. Which of the following agents is most likely?

D. Rubella

C. Measles

B. HHV-6

10. Why are nucleic acids of -SSRNA and dsRNA not infectious unlike most dsDNA viruses and +SS RNA viruses (except HBV and Poxvirus)?

Because -SSRNA and dsRNA undergo rapid degradation in host cells, making them non-infectious.

Because -SSRNA and dsRNA lack the necessary genetic material to infect host cells.

Because -SSRNA and dsRNA require specific protein receptors on host cells to initiate infection.

The correct answer explains that -SSRNA and dsRNA viruses require Polymerases contained in complete virions for infection, unlike DsDNA and +SSRNA viruses which can use host cell machinery. The incorrect answers provide plausible but inaccurate explanations for why -SSRNA and dsRNA are not infectious.

Explanation

The correct answer explains that -SSRNA and dsRNA viruses require Polymerases contained in complete virions for infection, unlike DsDNA and +SSRNA viruses which can use host cell machinery. The incorrect answers provide plausible but inaccurate explanations for why -SSRNA and dsRNA are not infectious.

11. How do you diagnose someone with AIDS?

By solely relying on ELISA test results

By considering oral thrush as an AIDS-defining infection

By using Western blot to exclude HIV infection

12. Guy with CCR5 Homozygous mutation is immune to particular virus, what are structural genes of this virus?

ENV (Envelope protein), CAP (Capsid protein), LYS (Lysogenic enzyme)

HAP (Helicase), RNS (Ribonuclease), PRS (Protease)

POL (Polymerase), TAQ (DNA Polymerase), GAG (Glycosylase)

13. What virus structure does the Measles virus belong to?

Measles virus belongs to orthomyxovirus family which are SS-, Enveloped, Spherical, DNA viruses.

Measles virus belongs to flavivirus family which are SS+, Enveloped, Icosahedral, RNA viruses.

Measles virus belongs to retrovirus family which are DS+, Non-enveloped, Icosahedral, DNA viruses.

14. What is the main mechanism of oncogenesis by Oncogenic Retroviruses (HTLV-1)?

They induce apoptosis in infected cells

They cause mutations in the host cell DNA

They insert their DNA into the host cell genome

Oncogenic retroviruses like HTLV-1 do not directly insert their DNA into the host cell genome, induce apoptosis, or cause mutations. Instead, they carry genes for proteins that act as cellular growth factors, promoting uncontrolled cell growth and division.

Explanation

Oncogenic retroviruses like HTLV-1 do not directly insert their DNA into the host cell genome, induce apoptosis, or cause mutations. Instead, they carry genes for proteins that act as cellular growth factors, promoting uncontrolled cell growth and division.

15. A IV drug user dies due to Esophageal varcieal bleeding associated with cirrhosis, on biopsy of liver you see Lymphoid aggregates with focal areas of Macrovesicular steatosis. What is the most likely cause?

16. A female presents with the recent onset of vaginal discharge. Physical examination reveals multiple clear vesicles on her vulva and vagina. A smear of material obtained from one of these vesicles reveals several multinucleated giant cells with intranuclear inclusions and groundglass nuclei. These vesicles are most likely the result of an infection with:

Gonorrhea

Trichomoniasis

Chlamydia

The presentation of clear vesicles on the vulva and vagina with multinucleated giant cells containing intranuclear inclusions and groundglass nuclei is characteristic of HSV infection. This can manifest as HSV1 or HSV2, with HSV2 being more commonly associated with genital herpes.

Explanation

The presentation of clear vesicles on the vulva and vagina with multinucleated giant cells containing intranuclear inclusions and groundglass nuclei is characteristic of HSV infection. This can manifest as HSV1 or HSV2, with HSV2 being more commonly associated with genital herpes.

17. Which virus genome is NOT a retrovirus, has Reverse transcriptase, is partially double-stranded, circular, and enveloped?

Hepatitis C virus (HCV)

Human Immunodeficiency Virus (HIV)

Influenza virus

HBV fits the description provided in the question including the presence of Reverse transcriptase and its unique characteristics such as being partially double-stranded, circular, and enveloped. The other options do not have these specific features mentioned.

Explanation

HBV fits the description provided in the question including the presence of Reverse transcriptase and its unique characteristics such as being partially double-stranded, circular, and enveloped. The other options do not have these specific features mentioned.

18. A pregnant female with HbsAg+, HbeAg+, AntiHbc Ab+(IgG) is highly infectious. What should be done to protect the baby?

The baby should be isolated from the mother immediately after birth.

The baby should not be breastfed.

The baby should be given antibiotics.

19. Why was smallpox able to be eradicated?

D. The small size of the Poxvirus made it less likely to spread, aiding in its eradication.

B. Smallpox is caused by a retrovirus, which is easier to target with antiretroviral drugs.

C. Lack of effective treatments for smallpox made it easier to eradicate through quarantine measures.

A. Due to the quick mutation rate of Poxvirus, making it easy to develop new vaccines.

Smallpox was able to be eradicated mainly due to the fact that Poxvirus has a single stable serotype, eliminating the need for new vaccine formulations every year. This allowed for the development and administration of a single live (attenuated) vaccine to effectively eradicate the virus.

Explanation

Smallpox was able to be eradicated mainly due to the fact that Poxvirus has a single stable serotype, eliminating the need for new vaccine formulations every year. This allowed for the development and administration of a single live (attenuated) vaccine to effectively eradicate the virus.

20. A 16 year old teen presents with Posterior cervical lymphadenopathy, fever, hepatosplenomegaly, pharyngitis, and a positive Monospot test indicating heterophils antibodies. What type of atypical lymphocytes are likely to be seen on blood smear?

Helper T lymphocytes

B lymphocytes

Natural killer cells

The presence of cytotoxic T lymphocytes on the blood smear is characteristic of Epstein-Barr Virus (EBV) infection, which can cause infectious mononucleosis. These cytotoxic T lymphocytes are reactive and play a role in controlling EBV-infected B lymphocytes.

Explanation

The presence of cytotoxic T lymphocytes on the blood smear is characteristic of Epstein-Barr Virus (EBV) infection, which can cause infectious mononucleosis. These cytotoxic T lymphocytes are reactive and play a role in controlling EBV-infected B lymphocytes.

21. After adopting a child from Southeast Asia, a mother develops jaundice, increased AST, ALT (with AST higher than ALT), and mixed hyperbilirubinemia. What virus is likely responsible?

Hepatitis B (HepB)

Rotavirus A

Hepatitis C (HepC)

Hepatitis A is common in Southeast Asia and can be prevented with vaccination. The transmission is fecal-oral, and diagnosis is typically made using serologic tests.

Explanation

Hepatitis A is common in Southeast Asia and can be prevented with vaccination. The transmission is fecal-oral, and diagnosis is typically made using serologic tests.

22. A medical student on the Caribbean island of Dominica presents at the Student Health Clinic complaining of an increasingly severe headache and back and bone pain. Yesterday she was nauseated and vomited several times during the night. She has a 39.5°C/103°F fever, which appeared suddenly, and a generalized rash that blanches under pressure. She had been hiking in the rainforest 1 week earlier and was particularly bothered by mosquitoes at that time. The most likely infectious agent causing her symptoms is?

*DENGUE Virus-causing "BreakBone fever"*This virus can be transmitted by mosquito bites and is present in Caribbean.

Malaria parasite

Zika virus

Chikungunya virus

Dengue virus is a common mosquito-borne virus in the Caribbean region and can cause symptoms such as severe headache, bone pain, fever, and rash. It is known for causing 'BreakBone fever'. The other options mentioned are also mosquito-borne diseases, but they do not typically present with the combination of symptoms described in the case scenario.

Explanation

Dengue virus is a common mosquito-borne virus in the Caribbean region and can cause symptoms such as severe headache, bone pain, fever, and rash. It is known for causing 'BreakBone fever'. The other options mentioned are also mosquito-borne diseases, but they do not typically present with the combination of symptoms described in the case scenario.

23. Why is it important to know that rota virus is non-enveloped?

Because non-enveloped viruses are more common in tropical regions.

Because enveloped viruses like rota virus are easier to neutralize with disinfectants.

Because knowing the structure of the virus affects its mode of transmission.

Understanding the envelope status of a virus can help in selecting appropriate disinfection methods, making it crucial to know that rota virus is non-enveloped to understand its resistance to Ethanol.

Explanation

Understanding the envelope status of a virus can help in selecting appropriate disinfection methods, making it crucial to know that rota virus is non-enveloped to understand its resistance to Ethanol.

24. Which types of hepatitis have vaccines available?

*Hep B(SUBUNIT vaccine, involves HbsAg)and HepA(Killed vaccine)

Hepatitis D

Hepatitis C

Hepatitis E

Hepatitis B and Hepatitis A are the only types for which vaccines are currently available.

Explanation

Hepatitis B and Hepatitis A are the only types for which vaccines are currently available.

25. What is the Eclipse phenomenon?

*Time between onset of infection and appearance of INTRAcellular virus.<Not Super HY for boards but you never know...

A software development tool

A celestial event involving the moon blocking the sun

A type of eye condition

The Eclipse phenomenon refers to the time between the onset of infection and the appearance of intracellular virus. It is not related to software development tools, celestial events, or eye conditions.

Explanation

The Eclipse phenomenon refers to the time between the onset of infection and the appearance of intracellular virus. It is not related to software development tools, celestial events, or eye conditions.

26. A 6-year-old boy develops a facial rash that has the appearance of a slap to the face. The rash, which is composed of small red spots, subsequently involves the upper and lower extremities. This boy also has arthralgia and suddenly develops a life-threatening aplastic crisis of the bone marrow. The most likely infectious agent causing these symptoms is.

Cytomegalovirus

Rubella virus

Varicella-zoster virus

Parvovirus

Parvovirus infection can cause a distinct facial rash (slapped cheek appearance), followed by a rash on the extremities, arthralgia, and aplastic crisis of the bone marrow. Rubella virus does not typically cause arthralgia or aplastic crisis. Varicella-zoster virus causes chickenpox (vesicular rash) and shingles (dermatomal rash), not the specific rash described. Cytomegalovirus can cause various symptoms but does not typically present with the typical facial rash seen in Parvovirus infection.

Explanation

Parvovirus infection can cause a distinct facial rash (slapped cheek appearance), followed by a rash on the extremities, arthralgia, and aplastic crisis of the bone marrow. Rubella virus does not typically cause arthralgia or aplastic crisis. Varicella-zoster virus causes chickenpox (vesicular rash) and shingles (dermatomal rash), not the specific rash described. Cytomegalovirus can cause various symptoms but does not typically present with the typical facial rash seen in Parvovirus infection.

27. Guy who vomits DARK blood, is jaundiced, on liver biopsy you see councilman bodies(Represent apoptosis of hepatocytes), virus ?

Hepatitis A virus transmitted via contaminated food and water sources

Diphtheria toxin causing hepatotoxicity

Chikungunya virus transmitted by Aedes mosquitoes

The correct answer is YELLOW FEVER based on the symptoms described in the question such as vomiting dark blood, jaundice, and presence of councilman bodies on liver biopsy. The incorrect answers do not match the symptom presentation or mode of transmission for the described virus.

Explanation

The correct answer is YELLOW FEVER based on the symptoms described in the question such as vomiting dark blood, jaundice, and presence of councilman bodies on liver biopsy. The incorrect answers do not match the symptom presentation or mode of transmission for the described virus.

28. What virus is characterized by influenza-like symptoms that progress to rash, muscle pain, joint pain, and bone pain, and can produce a potentially fatal hemorrhagic disorder known as Breakbone fever?

Ebola virus

Chikungunya virus

Zika virus

Dengue fever, also known as Breakbone fever, is caused by the Flavivirus and transmitted by Aedes mosquito. It presents with symptoms such as rash, muscle pain, joint pain, and bone pain, leading to a potentially fatal hemorrhagic disorder.

Explanation

Dengue fever, also known as Breakbone fever, is caused by the Flavivirus and transmitted by Aedes mosquito. It presents with symptoms such as rash, muscle pain, joint pain, and bone pain, leading to a potentially fatal hemorrhagic disorder.

29. NONcardiogenic pulmonary edema resulting from increased permeability of the pulmonary capillaries. Hypotension with fever and Myalgia(ESP: in Lower legs) leukocytosis, atypical lymphocytes, thrombocytopenia, coagulopathy, and decreased serum protein concentrations. Abdominal pain that mimics acute abdomen. Causative virus belongs to?

Paramyxoviridae

Filoviridae

Flaviviridae

The correct answer is HANTAVIRUS which belongs to Bunyaviridae. Filoviridae, Paramyxoviridae, and Flaviviridae do not match the description of the symptoms provided in the question.

Explanation

The correct answer is HANTAVIRUS which belongs to Bunyaviridae. Filoviridae, Paramyxoviridae, and Flaviviridae do not match the description of the symptoms provided in the question.

Advanced Virology: Clinical Manifestations and Diagnostic Insights

1. A pregnant female developed fulminant hepatitis and died. Liver biopsy shows patchy necrosis. She most likely got the virus from?

2.

What first name or nickname would you like us to use?

2. Why do we still have cases of post-transfusion hepatitis?

3. Which DNA virus is the most likely cause of severe pneumonia in patients with underlying lung disease or who are smokers?

4. What is a correct interpretation of the hepatitis panel?

5. How are human papilloma virus type 4 warts spread?

6. In the eastern United States, what is the most common reservoir of the disease that causes disorientation, confusion, hallucinations, and excessive salivation in a patient presenting to the emergency department?

7. Infection of appropriate cells with a composite virus made up of Coxsackie virus capsid components and poliovirus RNA would yield progeny which would

8. What is the status of the ER resident who was accidentally stuck with a needle from a hepatitis B virus-positive patient?

9. A 6-year-old girl presents to the emergency department with a fever and a lacy body rash. Her mother says that yesterday the rash was only on her face, but by this morning, had spread to her trunk and extremities. Which of the following agents is most likely?

10. Why are nucleic acids of -SSRNA and dsRNA not infectious unlike most dsDNA viruses and +SS RNA viruses (except HBV and Poxvirus)?

11. How do you diagnose someone with AIDS?

12. Guy with CCR5 Homozygous mutation is immune to particular virus, what are structural genes of this virus?

13. What virus structure does the Measles virus belong to?

14. What is the main mechanism of oncogenesis by Oncogenic Retroviruses (HTLV-1)?

15. A IV drug user dies due to Esophageal varcieal bleeding associated with cirrhosis, on biopsy of liver you see Lymphoid aggregates with focal areas of Macrovesicular steatosis. What is the most likely cause?

17. Which virus genome is NOT a retrovirus, has Reverse transcriptase, is partially double-stranded, circular, and enveloped?

18. A pregnant female with HbsAg+, HbeAg+, AntiHbc Ab+(IgG) is highly infectious. What should be done to protect the baby?

19. Why was smallpox able to be eradicated?

20. A 16 year old teen presents with Posterior cervical lymphadenopathy, fever, hepatosplenomegaly, pharyngitis, and a positive Monospot test indicating heterophils antibodies. What type of atypical lymphocytes are likely to be seen on blood smear?

21. After adopting a child from Southeast Asia, a mother develops jaundice, increased AST, ALT (with AST higher than ALT), and mixed hyperbilirubinemia. What virus is likely responsible?

23. Why is it important to know that rota virus is non-enveloped?

24. Which types of hepatitis have vaccines available?

25. What is the Eclipse phenomenon?

27. Guy who vomits DARK blood, is jaundiced, on liver biopsy you see councilman bodies(Represent apoptosis of hepatocytes), virus ?

28. What virus is characterized by influenza-like symptoms that progress to rash, muscle pain, joint pain, and bone pain, and can produce a potentially fatal hemorrhagic disorder known as Breakbone fever?