Vaccine and Vaccination Practice Questions

Q: Assertion: VZV vaccine is live attenuated. Reason: It cannot be given to immunocompromised patients.

Both true, reason explains assertion. ***Both true, reason explains assertion*** - The **VZV (varicella-zoster virus) vaccine** is indeed a **live attenuated vaccine** containing weakened virus - the assertion is **TRUE** - It **cannot be given to immunocompromised patients** due to risk of vaccine-strain disease - the reason is **TRUE** - The reason **directly explains the assertion**: BECAUSE the vaccine is live attenuated, it poses infection risk and therefore cannot be used in immunocompromised individuals - The **causal relationship** is clear: live attenuated nature → contraindication in immunocompromised patients *Both true, reason doesn't explain assertion* - While both statements are factually true, this option would only be correct if the reason was unrelated to the assertion - However, the reason **directly explains WHY** the live attenuated nature is clinically significant - The contraindication is a **direct consequence** of the vaccine being live attenuated, so the reason does explain the assertion *Assertion true, reason false* - The assertion is true (VZV vaccine is live attenuated) - However, the reason is also **TRUE** - live attenuated vaccines are indeed contraindicated in immunocompromised patients due to risk of disseminated vaccine-strain infection - Since both statements are true, this option is incorrect *Assertion false, reason true* - The assertion is **TRUE**, not false - VZV vaccine (Varivax, Zostavax) is a **live attenuated vaccine** containing the Oka strain - This option incorrectly claims the assertion is false - Since the assertion is factually correct, this option cannot be right

Q: MW vaccine is prepared from:

Mycobacterium indicus pranii. ***Mycobacterium indicus pranii*** - The MW vaccine, also known as the **M. indicus pranii (MIP) vaccine**, is derived from heat-killed *M. indicus pranii* cells. - It is currently being explored as an immunomodulator and vaccine candidate for **leprosy** and **tuberculosis**. *Mycobacterium welchii* - This is an incorrect name; the correct species is *Clostridium perfringens*, previously known as *Bacillus welchii*. - *Clostridium perfringens* is a **gram-positive, anaerobic bacterium** that causes gas gangrene and food poisoning, and is not used in vaccine production for tuberculosis or leprosy. *Mycobacterium bovis* - *Mycobacterium bovis* is the bacterium used to produce the **BCG vaccine** (Bacillus Calmette-Guérin). - The BCG vaccine is primarily used to prevent **tuberculosis**, particularly severe forms in children. *Mycobacterium tuberculosis* - This is the primary causative agent of **tuberculosis** in humans. - A vaccine derived directly from live, virulent *M. tuberculosis* is not used due to its pathogenicity and the risk of causing disease.

Q: Which of the following vaccines is not a live attenuated vaccine?

Hepatitis B. ***Hepatitis B*** - The **Hepatitis B vaccine** is a **recombinant vaccine**, meaning it contains only a purified component (the outer surface protein) of the virus, not the whole live attenuated virus. - As it's not a live vaccine, it's generally safe for immunocompromised individuals and pregnant women. *Oral polio vaccine* - The **oral polio vaccine (OPV)** is a **live attenuated vaccine** that contains weakened forms of the poliovirus strains. - It induces strong mucosal immunity in the gut, which is crucial for preventing transmission. *Measles* - The **measles vaccine** (part of the MMR vaccine) is a **live attenuated vaccine** containing a weakened form of the measles virus. - It stimulates a robust immune response that closely mimics natural infection without causing the disease. *BCG* - The **BCG vaccine** is a **live attenuated vaccine** derived from a weakened strain of *Mycobacterium bovis*. - It is primarily used to prevent severe forms of tuberculosis, especially in children.

Q: Which agent provides immediate passive immunity in post-exposure prophylaxis for rabies?

Rabies immunoglobulin. ***Rabies immunoglobulin*** - Provides **immediate, passive immunity** by supplying pre-formed antibodies that neutralize the rabies virus before the body can produce its own antibodies. - It is administered directly into and around the **wound site** and intramuscularly, acting rapidly to prevent viral entry into the nervous system. *BCG vaccine* - This vaccine is used against **tuberculosis** and does not offer any protection against rabies. - It stimulates **active immunity** against *Mycobacterium tuberculosis* over several weeks, not immediate passive immunity. *MMR vaccine* - The MMR vaccine protects against **measles, mumps, and rubella** and has no role in rabies prophylaxis. - It induces **active immunity** to these specific viral diseases, requiring time for the immune system to develop antibodies. *Tetanus toxoid* - The tetanus toxoid vaccine provides **active immunity** against **tetanus** by stimulating the production of antibodies to the tetanus toxin. - It does not offer any protective effect against the rabies virus.

Q: Which of the following is not a polysaccharide vaccine?

Hepatitis B vaccine. ***Hepatitis B vaccine (recombinant protein vaccine)*** - This is a **recombinant protein vaccine** which contains **HBsAg** (Hepatitis B surface antigen) produced in yeast. - As it uses a protein antigen, it is not a polysaccharide vaccine. *Pneumococcal vaccine (includes polysaccharide forms)* - There are two types: **Pneumococcal Polysaccharide Vaccine (PPSV23)** which is a pure polysaccharide vaccine, and **Pneumococcal Conjugate Vaccine (PCV13, PCV15, PCV20)** which contains polysaccharides conjugated to a protein carrier. - Both types utilize **polysaccharide antigens** from *Streptococcus pneumoniae* to elicit an immune response. *Meningococcal vaccine (includes polysaccharide forms)* - Similar to pneumococcal vaccines, there are **meningococcal polysaccharide vaccines (MPSV4)** and **meningococcal conjugate vaccines (MCV4)**. - These vaccines use **polysaccharides** from the capsule of *Neisseria meningitidis* as their immunogenic component, either alone or conjugated. *H. Influenza B vaccine (conjugate vaccine derived from polysaccharides)* - This is a **conjugate vaccine** that uses a **polysaccharide capsule antigen** from *Haemophilus influenzae type B* (Hib) chemically linked to a protein carrier. - Conjugation improves immunogenicity, especially in infants, by converting the T-independent polysaccharide antigen into a T-dependent one.

Q: What is the primary advantage of using live attenuated vaccines?

They provide stronger, longer-lasting immunity. ***They provide stronger, longer-lasting immunity*** - Live attenuated vaccines mimic natural infection, leading to a robust immune response involving both **humoral** and **cell-mediated immunity**. - This comprehensive immune activation often results in **lifelong protection** with fewer doses, similar to immunity gained from natural infection. *They are cheaper to produce* - The production of live attenuated vaccines can be complex due to the need for careful **attenuation** and strict quality control, which can be costly. - While some attenuated vaccines might be cost-effective in the long run due to fewer doses, initial production costs are not their primary advantage. *They are effective with single doses* - While many live attenuated vaccines are highly effective with a single dose, not all are; some, like MMR, still require a second dose for optimal protection. - The effectiveness with fewer doses is rather a consequence of the strong immune response, not a standalone advantage over the quality of immunity. *They require fewer booster shots* - This is a direct benefit stemming from the **strong, long-lasting immunity** conferred by live attenuated vaccines. - However, the primary advantage is the quality and duration of the immune response itself, which in turn reduces the need for frequent boosters.

Q: Which vaccine traditionally required special precautions in children with severe egg allergy?

Influenza. ***Influenza*** - The influenza vaccine was traditionally produced in **embryonated chicken eggs**, making it a concern for individuals with **severe egg allergies**. - Current guidelines generally state that individuals with egg allergy can receive the flu vaccine, but in the past, special precautions were often recommended. *Measles* - The measles vaccine (MMR) is grown in **chicken embryo fibroblast cultures**, but studies have shown no increased risk of allergic reactions in egg-allergic individuals. - It does not contain significant amounts of **egg protein**, and allergy to eggs is not a contraindication. *BCG* - The BCG vaccine (Bacille Calmette-Guérin) is derived from a strain of *Mycobacterium bovis* and is not produced using **egg components**. - It does not pose a risk for individuals with egg allergy. *Hepatitis B* - The hepatitis B vaccine is a **recombinant vaccine**, meaning it is produced using genetically engineered yeast cells, not **egg components**. - Therefore, it is safe for individuals with egg allergy.

Q: In the context of viral diseases, which of the following is a key advantage of live attenuated vaccines over inactivated vaccines?

Induces long-term immunity with a single dose.. ***Induces long-term immunity with a single dose*** - **Live attenuated vaccines** stimulate a more comprehensive immune response, mimicking natural infection, leading to stronger and **longer-lasting immunity** often with a single dose. - This robust response typically involves both **humoral and cellular immunity**, providing excellent protection. *Safe for use in immunocompromised patients* - **Live attenuated vaccines** are generally **contraindicated in immunocompromised individuals** due to the risk of the attenuated virus replicating and causing disease. - **Inactivated vaccines**, which do not contain live virus, are safer for this population. *Elicits a robust antibody response without risk of reversion* - While live attenuated vaccines do elicit a robust immune response, there is a **small risk of the attenuated virus reverting to a virulent form**, especially in populations with low vaccine coverage. - **Inactivated vaccines** do not carry this risk as the virus is killed and cannot replicate or revert. *Preferred for mass vaccination during an outbreak* - While sometimes used, **live attenuated vaccines** require careful handling, cold chain maintenance, and may have contraindications that complicate mass vaccination efforts during an outbreak. - **Inactivated vaccines** can sometimes be easier to administer during a large-scale outbreak due to their stability and perceived safety profile in diverse populations.

Q: A 6-month-old infant is brought to the clinic with a history of severe cough. Upon examination, the child exhibits severe respiratory distress and is diagnosed with pertussis. Which vaccine is recommended for prevention?

Subunit. ***Subunit*** - The **pertussis vaccine** (DTaP for infants/children and Tdap for adolescents/adults) is a **subunit vaccine**, meaning it contains only specific purified antigens from the *Bordetella pertussis* bacterium, such as pertussis toxin, filamentous hemagglutinin, and pertactin. - This type of vaccine is used because the whole-cell pertussis vaccine (DTP) was associated with a higher rate of adverse effects, leading to the development of safer acellular subunit formulations. *Live attenuated* - **Live attenuated vaccines** contain a weakened form of the pathogen that can replicate in the host without causing severe disease, providing a strong immune response (e.g., MMR, varicella, rotavirus). - While effective, live attenuated vaccines are generally not used for pertussis due to concerns about safety and potential for reversion to virulence in some cases. *Inactivated* - **Inactivated vaccines** contain whole pathogens that have been killed or inactivated, preventing them from replicating but retaining their antigenicity (e.g., inactivated polio vaccine, influenza vaccine). - While one of the older pertussis vaccines (DTP) was a **whole-cell inactivated vaccine**, the current recommended DTaP/Tdap vaccines are **acellular subunit vaccines**, which are safer due to fewer adverse reactions. *Conjugate* - **Conjugate vaccines** are created by chemically linking a polysaccharide antigen (which is T-cell independent) to a protein carrier (which is T-cell dependent), thereby eliciting a more robust and long-lasting immune response, especially in infants (e.g., Hib, pneumococcal, meningococcal vaccines). - The pertussis vaccine is not a conjugate vaccine; its antigens are primarily proteins (e.g., pertussis toxin), not polysaccharides conjugated to a carrier protein.

Q: Which type of vaccine is used for the prevention of rotavirus infections?

Live attenuated. ***Live attenuated*** - **Live attenuated vaccines** contain a weakened version of the virus, which can replicate to a limited extent, stimulating a strong and long-lasting immune response without causing severe disease. - The **rotavirus vaccine** (e.g., Rotarix, RotaTeq) is a live attenuated vaccine administered orally to prevent severe diarrheal disease in infants. *Inactivated* - **Inactivated vaccines** contain whole viruses that have been killed, meaning they cannot replicate. They require multiple doses to achieve immunity and generally elicit a weaker immune response than live attenuated vaccines. - While many vaccines are inactivated (e.g., poliovirus IPV, influenza), the primary rotavirus vaccines currently in use are not of this type. *Subunit* - **Subunit vaccines** contain only specific antigenic components of a pathogen, rather than the whole pathogen. They are generally very safe but may require adjuvants and multiple doses to elicit a robust immune response. - These vaccines are used for pathogens like hepatitis B and HPV, but not for current rotavirus vaccines. *Toxoid* - **Toxoid vaccines** are made from inactivated bacterial toxins, which stimulate the immune system to produce antibodies against the toxin itself, rather than the bacteria. - They are used to prevent diseases mediated by bacterial toxins, such as **tetanus** and **diphtheria**, and are entirely unrelated to viral infections like rotavirus.

Question 1

Assertion: VZV vaccine is live attenuated. Reason: It cannot be given to immunocompromised patients.

Accepted Answer

Both true, reason explains assertion

Answer

Both true, reason doesn't explain assertion

Answer

Assertion true, reason false

Answer

Assertion false, reason true

Question 2

MW vaccine is prepared from:

Accepted Answer

Mycobacterium indicus pranii

Answer

Mycobacterium welchii

Answer

Mycobacterium bovis

Answer

Mycobacterium tuberculosis

Question 3

Which of the following vaccines is not a live attenuated vaccine?

Accepted Answer

Hepatitis B

Answer

Oral polio vaccine

Answer

Measles

Answer

BCG

Question 4

Which agent provides immediate passive immunity in post-exposure prophylaxis for rabies?

Accepted Answer

Rabies immunoglobulin

Answer

BCG vaccine

Answer

MMR vaccine

Answer

Tetanus toxoid

Question 5

Which of the following is not a polysaccharide vaccine?

Accepted Answer

Hepatitis B vaccine

Answer

Pneumococcal vaccine

Answer

Meningococcal vaccine

Answer

H. Influenzae B vaccine

Question 6

What is the primary advantage of using live attenuated vaccines?

Accepted Answer

They provide stronger, longer-lasting immunity

Answer

They are effective with single doses

Answer

They are cheaper to produce

Answer

They require fewer booster shots

Question 7

Which vaccine traditionally required special precautions in children with severe egg allergy?

Accepted Answer

Influenza

Answer

Measles

Answer

BCG

Answer

Hepatitis B

Question 8

In the context of viral diseases, which of the following is a key advantage of live attenuated vaccines over inactivated vaccines?

Accepted Answer

Induces long-term immunity with a single dose.

Answer

Safe for use in immunocompromised patients.

Answer

Elicits a robust antibody response without risk of reversion.

Answer

Preferred for mass vaccination during an outbreak.

Question 9

A 6-month-old infant is brought to the clinic with a history of severe cough. Upon examination, the child exhibits severe respiratory distress and is diagnosed with pertussis. Which vaccine is recommended for prevention?

Accepted Answer

Subunit

Answer

Live attenuated

Answer

Conjugate

Answer

Inactivated

Question 10

Which type of vaccine is used for the prevention of rotavirus infections?

Accepted Answer

Live attenuated

Answer

Inactivated

Answer

Subunit

Answer

Toxoid

Vaccine and Vaccination — MCQs

Vaccine and Vaccination — MCQs

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