Immunization and Vaccine-Preventable Diseases Practice Questions

Q: In which of the following cases is vaccine and immunoglobulin routinely given together as standard protocol for post-exposure prophylaxis in wound management?

Tetanus. ***Tetanus*** - For **unvaccinated** or inadequately vaccinated individuals with a **tetanus-prone wound** (contaminated, puncture, or devitalized tissue), both **tetanus immunoglobulin (TIG)** and **tetanus toxoid vaccine** are given concurrently as standard protocol. - **TIG** provides immediate passive immunity against tetanus toxin, while the **vaccine** initiates active immunity for long-term protection. - This is the classic example of combined passive-active immunization in wound management. *Rabies* - Rabies immunoglobulin (RIG) and rabies vaccine are given together for **Category III exposures** in previously unvaccinated individuals. - However, this is specific to animal bite/scratch exposure, not routine wound management. - The combination provides immediate protection (RIG) and long-term immunity (vaccine). *HBV* - For individuals exposed to **Hepatitis B virus** (e.g., needlestick injury) who are unvaccinated or non-immune, **Hepatitis B immunoglobulin (HBIG)** and **HBV vaccine** are administered simultaneously. - This is standard for occupational/high-risk exposures but not routine wound management. - Combination ensures immediate short-term protection and development of long-term immunity. *Measles* - Measles immunoglobulin (IG) may be used for post-exposure prophylaxis in high-risk susceptible individuals. - Measles vaccine is usually given alone within **72 hours** of exposure for prophylaxis. - IG and vaccine are generally **not given together routinely** as they may interfere with vaccine efficacy.

Q: Which vaccine is recommended for the prevention of measles in children under the Universal Immunization Programme in India?

Measles-Rubella (MR) vaccine / Measles-only vaccine. ***Measles-Rubella (MR) vaccine / Measles-only vaccine*** - Under India's **Universal Immunization Programme (UIP)**, the **Measles-Rubella (MR) vaccine** is the standard vaccine for measles prevention. - The **MR vaccine** is given at **9-12 months** (1st dose) and **16-24 months** (2nd dose). - Prior to MR vaccine introduction, **monovalent measles vaccine** was used at 9 months, making this historically and contextually relevant for India. - This is a **live attenuated vaccine** providing long-lasting immunity. *A combination vaccine covering measles, mumps, and rubella.* - While **MMR vaccine** is effective and available, it is **not part of the standard UIP** in India. - MMR is primarily used in **private healthcare settings** in India. - The UIP uses **MR vaccine** (not MMR) as the standard immunization. *Separate vaccines for measles, mumps, and rubella given individually* - Administering separate vaccines would require **multiple injections** and decrease compliance. - This approach is **not recommended or practiced** in routine immunization schedules. - Combination vaccines are preferred for better coverage and convenience. *Live attenuated measles vaccine given after 15 months of age only* - While measles vaccine is **live attenuated**, the timing is incorrect. - In India's UIP, the **first dose** is given at **9-12 months**, not after 15 months. - The word "only" makes this incorrect as it excludes the crucial first dose timing.

Q: Disease caused by a virus of the family of RNA paramyxovirus, with an incubation period of 14-21 days, high secondary attack rate, and the most common complication being aseptic meningitis. A live, attenuated vaccine is available for the disease, with the Jeryl Lynn strain. What is the name of this disease?

Mumps. ***Mumps*** - Mumps is caused by an **RNA paramyxovirus** and has a typical incubation period of **14-21 days**. - It is known for its **high secondary attack rate** and **aseptic meningitis** as the most common complication, aligning perfectly with the provided description. - The vaccine is developed from the **Jeryl Lynn strain**, which is the hallmark identifying feature of mumps vaccine. *Measles* - While also caused by an **RNA paramyxovirus** with a high attack rate, measles is primarily characterized by a **maculopapular rash** and respiratory symptoms, not aseptic meningitis as its most common complication. - The incubation period for measles is typically shorter, around **7-14 days**, and the vaccine strain is usually **Edmonston-Zagreb or Schwarz**, not Jeryl Lynn. *Rubella* - Rubella is caused by an **RNA togavirus**, not a paramyxovirus, and is characterized by a milder rash and lymphadenopathy. - The incubation period is typically **12-23 days**, but the viral family and common complications do not match the description. - Complications such as arthritis or encephalitis are rare. *Chicken pox* - Chickenpox is caused by the **varicella-zoster virus**, which is a **DNA herpesvirus**, not an RNA paramyxovirus. - It is characterized by a **vesicular rash** and can lead to complications like pneumonia or encephalitis, but not aseptic meningitis as its most common complication.

Q: Which vaccine is governed by the open vial policy that allows for the use of opened vials in later sessions?

TT (Tetanus Toxoid). ***TT (Tetanus Toxoid)*** - The **Open Vial Policy (OVP)** specifically applies to TT, which can be kept for up to **28 days (4 weeks)** after opening when stored correctly at 2-8°C, the VVM has not reached the discard point, aseptic technique is maintained, and the expiry date has not passed. - This policy helps minimize vaccine wastage, especially in settings where a full multi-dose vial may not be used in a single session. - TT is one of the **classic vaccines** covered under OVP along with DPT, DT, liquid pentavalent, HepB, and IPV. *Liquid Pentavalent vaccine* - **Liquid pentavalent vaccine IS covered under the Open Vial Policy** and can be kept for up to **28 days (4 weeks)** after opening under the same conditions as TT (proper storage, VVM usable, aseptic handling, within expiry). - However, TT is the more traditional and commonly cited example of OVP in Indian vaccination programs. *Measles vaccine* - The measles vaccine is a **live attenuated vaccine** that is highly sensitive to heat and light, and rapidly loses potency once reconstituted. - It must be used within **6 hours** after reconstitution and is **NOT covered under the Open Vial Policy**. - Reconstituted measles vaccine that is not used within 6 hours or at the end of the session must be discarded. *OPV (Oral Polio Vaccine)* - OPV must be **discarded at the end of each immunization session** once opened, even if doses remain in the vial. - It is **NOT covered under the Open Vial Policy** for opened vials. - Unopened OPV vials can be kept if VVM is usable, but this is different from the OVP for opened vials.

Q: Vi polysaccharide vaccine is a parenteral typhoid vaccine consisting of purified Vi polysaccharide from the Salmonella typhi bacterial capsule. Which of the following is a TRUE statement regarding Vi polysaccharide vaccine?

Can be given along with yellow fever and hepatitis vaccines. ***Can be given along with yellow fever and hepatitis vaccines***- The **Vi polysaccharide vaccine** has a good safety profile, allowing co-administration with other vaccines like **yellow fever** and **hepatitis A/B** without compromising efficacy or safety.- This co-administration is often practical for travelers requiring multiple vaccinations, simplifying the immunization schedule.*Has a high incidence of local reactions*- The Vi polysaccharide vaccine generally has a **low incidence of local reactions**, primarily mild pain or redness at the injection site, which are typically transient.- It does not cause severe or frequent local reactions that would be considered "high incidence."*Has significant adverse effects*- This vaccine is known for its **minimal systemic adverse effects**, which are usually mild and self-limiting, such as low-grade fever or headache.- Serious adverse events are extremely rare, making it a safe option for typhoid prevention.*Contraindicated in hepatitis*- There is **no contraindication** for the Vi polysaccharide vaccine in individuals with **hepatitis** (acute or chronic).- Its safety profile allows for administration in patients with liver conditions, as the vaccine itself is not hepatotoxic or known to exacerbate liver disease.

Q: At what age is the first dose of Measles vaccination given under the Universal Immunization Programme (UIP)?

9 months. ***9 months*** - The first dose of the **Measles-Rubella (MR) vaccine** is given at **9 months of age** as per India's Universal Immunization Programme (UIP). - This timing is chosen because **maternal antibodies** against measles, which can interfere with vaccine effectiveness, generally wane by this age. - A second dose is given at **16-24 months** to ensure adequate protection (Note: Some countries use MMR vaccine which includes mumps component as well). *10 weeks* - This age is associated with the administration of other routine vaccinations like **Pentavalent vaccine (DPT-HepB-Hib)** and **OPV/IPV**, not measles. - Administering the measles vaccine too early, when **maternal antibodies** are still high, leads to suboptimal immune response. *14 weeks* - This is when the **third dose of Pentavalent vaccine and OPV/IPV** are given as part of the routine immunization schedule. - This age is not the standard recommendation for initial measles vaccination. *6 months* - While specific high-risk situations (e.g., outbreaks or travel to endemic areas) might warrant an additional measles vaccine dose at 6 months, it is **not the routine recommended age** for the first dose. - At 6 months, there may still be sufficient **maternal antibodies** to interfere with vaccine efficacy, leading to poorer immune response compared to vaccination at 9 months. - If given at 6 months during outbreaks, the child still receives routine doses at 9 months and 16-24 months.

Q: Who should receive the typhoid oral vaccine?

Travelers to typhoid-endemic areas. ***Travelers to typhoid-endemic areas*** - This is the **primary indication** for oral typhoid vaccine (Ty21a). - Travelers to regions with **high typhoid prevalence** (South Asia, Southeast Asia, Africa, Latin America) are at significant risk of infection through contaminated food and water. - The oral live attenuated vaccine provides **70-80% protection** for approximately 5 years. - Both oral (Ty21a) and injectable (Vi polysaccharide) vaccines are available for travelers, with choice based on patient factors and preferences. *Laboratory workers handling Salmonella typhi* - While this is a **valid indication** for typhoid vaccination due to occupational exposure risk, it represents a much smaller population compared to travelers. - Laboratory workers should receive typhoid vaccination, but travelers represent the most common indication in clinical practice. *Pregnant women and immunocompromised individuals* - The oral typhoid vaccine is a **live attenuated vaccine** and is **contraindicated** in these populations. - Live vaccines pose theoretical risk of infection in immunocompromised hosts and during pregnancy. - If typhoid vaccination is essential, the **inactivated Vi polysaccharide vaccine** (injectable) may be considered instead. *All children above 6 years of age* - This is **not a universal recommendation** in non-endemic areas. - Typhoid vaccination in children is indicated only when traveling to **endemic regions** or for specific high-risk situations. - In India, typhoid vaccination may be recommended more broadly in endemic areas, but it's not part of the routine universal immunization schedule.

Q: The re-evaluation of a case of acute flaccid paralysis for residual paralysis for the purpose of AFP surveillance is done after how many days?

60 days. ***60 days*** - The 60-day mark is crucial for **AFP surveillance** as it helps distinguish between transient paralysis and **residual paralysis**, which is more indicative of serious conditions like polio. - This period allows sufficient time for most cases of non-polio AFP to resolve, making persistent paralysis at this point a strong indicator for further investigation. *90 days* - While 90 days might be relevant for some long-term follow-ups, it is not the standard timeframe for re-evaluating **residual paralysis** within the established **AFP surveillance** guidelines. - The primary classification for an **AFP case** as having residual paralysis, or not, is definitively made at 60 days post-onset. *6 months* - Six months is a much longer timeframe than required for the initial determination of **residual paralysis** in **AFP surveillance**. - By this point, immediate public health response for potential polio cases would be significantly delayed, missing a critical window for intervention. *1 year* - A one-year re-evaluation is far beyond the scope of immediate **AFP surveillance** objectives, which aim for rapid detection and response. - This duration would not facilitate timely public health actions to prevent potential polio outbreaks.

Question 1

In which of the following cases is vaccine and immunoglobulin routinely given together as standard protocol for post-exposure prophylaxis in wound management?

Accepted Answer

Tetanus

Answer

Rabies

Answer

HBV

Answer

Measles

Question 2

Which vaccine is recommended for the prevention of measles in children under the Universal Immunization Programme in India?

Accepted Answer

Measles-Rubella (MR) vaccine / Measles-only vaccine

Answer

Separate vaccines for measles, mumps, and rubella given individually

Answer

A combination vaccine covering measles, mumps, and rubella.

Answer

Live attenuated measles vaccine given after 15 months of age only

Question 3

Disease caused by a virus of the family of RNA paramyxovirus, with an incubation period of 14-21 days, high secondary attack rate, and the most common complication being aseptic meningitis. A live, attenuated vaccine is available for the disease, with the Jeryl Lynn strain. What is the name of this disease?

Accepted Answer

Mumps

Answer

Measles

Answer

Rubella

Answer

Chicken pox

Question 4

Which vaccine is governed by the open vial policy that allows for the use of opened vials in later sessions?

Accepted Answer

TT (Tetanus Toxoid)

Answer

Liquid Pentavalent vaccine

Answer

Measles vaccine

Answer

OPV (Oral Polio Vaccine)

Question 5

Vi polysaccharide vaccine is a parenteral typhoid vaccine consisting of purified Vi polysaccharide from the Salmonella typhi bacterial capsule. Which of the following is a TRUE statement regarding Vi polysaccharide vaccine?

Accepted Answer

Can be given along with yellow fever and hepatitis vaccines

Answer

Has a high incidence of local reactions

Answer

Has significant adverse effects

Answer

Contraindicated in hepatitis

Question 6

At what age is the first dose of Measles vaccination given under the Universal Immunization Programme (UIP)?

Accepted Answer

9 months

Answer

10 weeks

Answer

14 weeks

Answer

6 months

Question 7

Who should receive the typhoid oral vaccine?

Accepted Answer

Travelers to typhoid-endemic areas

Answer

Laboratory workers handling Salmonella typhi

Answer

All children above 6 years of age

Answer

Pregnant women and immunocompromised individuals

Question 8

The re-evaluation of a case of acute flaccid paralysis for residual paralysis for the purpose of AFP surveillance is done after how many days?

Accepted Answer

60 days

Answer

90 days

Answer

6 months

Answer

1 year

Immunization and Vaccine-Preventable Diseases — MCQs

Immunization and Vaccine-Preventable Diseases — MCQs

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