Immunization and Vaccine-Preventable Diseases — MCQs

Immunization and Vaccine-Preventable Diseases Indian Medical PG Practice Questions and MCQs

Question 431: Which vaccines are recommended at birth according to the Universal Immunization Program?

A. BCG & Hepatitis B (Correct Answer)
B. Hepatitis B
C. DPT & OPV
D. BCG & DPT

Explanation: ***BCG & Hepatitis B*** - The **Bacillus Calmette-Guérin (BCG) vaccine** is recommended at birth to protect against severe forms of tuberculosis. - The first dose of the **Hepatitis B vaccine** is also given at birth to prevent perinatal transmission of the virus. - **Note:** According to UIP guidelines, **OPV-0 (zero dose)** is also given at birth, but among the given options, this is the most comprehensive answer. *Hepatitis B* - While **Hepatitis B** is indeed given at birth, this option is incomplete as it misses **BCG**, which is also an essential vaccine administered at birth. - According to UIP guidelines, both vaccines are critical components of the birth immunization schedule. *DPT & OPV* - **DPT (Diphtheria, Pertussis, Tetanus)** and **OPV-1 (Oral Polio Vaccine)** are started at 6 weeks of age, not at birth. - While **OPV-0 (zero dose)** is given at birth, it is not paired with DPT at that time. *BCG & DPT* - **BCG** is given at birth, but **DPT** is not. - **DPT** is administered starting from 6 weeks of age as part of the primary immunization series.

Question 432: Which vaccine is required for a patient traveling to a country with endemic yellow fever?

A. Yellow fever vaccine (Correct Answer)
B. Typhoid vaccine
C. Hepatitis A vaccine
D. Rabies vaccine

Explanation: ***Yellow fever vaccine*** - The **yellow fever vaccine** is specifically designed to prevent infection by the **yellow fever virus**, which is endemic in certain tropical and subtropical regions of Africa and South America. - Countries with endemic yellow fever often require proof of vaccination (e.g., International Certificate of Vaccination or Prophylaxis) for entry to prevent disease transmission. *Typhoid vaccine* - The **typhoid vaccine** is indicated for travelers visiting areas with a risk of **typhoid fever**, which is caused by the bacterium *Salmonella Typhi*, commonly transmitted through contaminated food and water. - While typhoid can be prevalent in regions with poor sanitation, it is distinct from yellow fever and does not directly address the risk of yellow fever endemicity. *Hepatitis A vaccine* - The **Hepatitis A vaccine** protects against the Hepatitis A virus, which causes an acute liver infection and is primarily transmitted through the **fecal-oral route**, often via contaminated food or water. - It is recommended for travelers to many developing countries but is not a specific requirement for entry into yellow fever endemic areas unless general health risks are also high. *Rabies vaccine* - The **rabies vaccine** is given to prevent rabies, a viral disease transmitted through the bite or scratch of an infected animal, and it is primarily recommended for travelers who will be in close contact with animals in regions where rabies is prevalent. - Rabies risk is separate from yellow fever and does not fulfill the entry requirements or provide protection against yellow fever.

Question 433: What is the primary objective of the Intensified Mission Indradhanush 4.0?

A. To introduce new vaccines into the immunization schedule
B. To reduce vaccine wastage
C. To increase the frequency of vaccination sessions
D. To achieve comprehensive immunization coverage in underserved areas (Correct Answer)

Explanation: **To achieve comprehensive immunization coverage in underserved areas** - **Intensified Mission Indradhanush (IMI) 4.0** aims to accelerate immunization for all pregnant women and children who have missed routine vaccinations, particularly focusing on reaching **unreached populations** in difficult-to-access areas. - The primary goal is to improve **full immunization coverage** and reduce child mortality by targeting those who have either partially received or completely missed their vaccinations. *To introduce new vaccines into the immunization schedule* - While new vaccines may be introduced into the broader immunization program, this is not the **primary and specific objective** of the *Intensified* Mission Indradhanush initiatives. - IMI 4.0 focuses on *strengthening* the delivery of *existing* vaccines to those already eligible, rather than expanding the vaccine portfolio. *To reduce vaccine wastage* - **Vaccine wastage reduction** is an important operational goal in any immunization program, but it is a **secondary outcome** of efficient vaccine delivery, not the core objective of IMI 4.0 itself. - The mission's main emphasis is on *reaching* beneficiaries, not primarily on optimizing vaccine use logistics. *To increase the frequency of vaccination sessions* - Increasing session frequency can be a *strategy* employed to achieve better coverage, but it is not the over-arching primary objective of IMI 4.0. - The mission aims for broader **immunization coverage**, which may involve various strategies including increased session frequency, but also microplanning, community mobilization, and tracking of beneficiaries.

Question 434: A public health initiative is launched to educate the community about the importance of vaccines. Which of the following statements is true regarding the cold chain system for vaccines?

A. The cold chain system includes maintaining vaccines between 2-8°C (Correct Answer)
B. The cold chain system is only required for transportation, not storage
C. Vaccines can be stored at room temperature for short durations without compromising efficacy
D. Live vaccines are less sensitive to temperature variations than inactivated vaccines

Explanation: ***The cold chain system includes maintaining vaccines between 2-8°C*** - This temperature range is crucial for maintaining the **potency** and **efficacy** of most vaccines. - Excursions outside this range can lead to vaccine degradation and loss of immune protection. *Live vaccines are less sensitive to temperature variations than inactivated vaccines.* - **Live attenuated vaccines** (e.g., MMR, varicella) are generally **more sensitive** to temperature variations and freezing than inactivated vaccines. - Inactivated vaccines are more stable at fridge temperatures, but can still be damaged by **freezing**. *The cold chain system is only required for transportation, not storage* - The cold chain system is vital for **both transportation and storage** of vaccines from the point of manufacture until administration. - Maintaining recommended temperatures at all stages prevents **loss of potency** and ensures vaccine effectiveness. *Vaccines can be stored at room temperature for short durations without compromising efficacy.* - While some vaccines have a very limited allowed out-of-cold-chain exposure time, **prolonged exposure to room temperature** (which varies) can compromise vaccine efficacy. - Strict adherence to cold chain guidelines is necessary to prevent **thermal damage** and ensure vaccine quality.

Question 435: Which type of vaccine is used for the prevention of rotavirus infections?

A. Live attenuated (Correct Answer)
B. Inactivated
C. Subunit
D. Toxoid

Explanation: ***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 436: Which of the following vaccines is most sensitive to freezing?

A. BCG
B. OPV
C. Hepatitis B
D. DTP (Correct Answer)

Explanation: **DTP** - **DTP (Diphtheria, Tetanus, Pertussis)** vaccine contains an **adjuvant**, typically an aluminum salt, which is highly susceptible to damage from freezing. - Freezing causes the adjuvant to precipitate, leading to a loss of efficacy and an increased risk of local adverse reactions due to improper antigen release. *BCG* - **BCG (Bacillus Calmette-Guérin)** vaccine is a **live attenuated vaccine** that is not generally sensitive to freezing. - Its stability is primarily impacted by heat and light once reconstituted, rather than cold temperatures. *OPV* - **OPV (Oral Polio Vaccine)** is another **live attenuated vaccine** that is quite stable at freezing temperatures and often stored frozen. - It maintains its potency well even after repeated freeze-thaw cycles, making it less sensitive to freezing than DTP. *Hepatitis B* - The **Hepatitis B vaccine** contains an **aluminum adjuvant**, similar to DTP, and is also sensitive to freezing. - However, among the options provided, DTP is generally highlighted as being particularly sensitive due to its adjuvant and susceptibility to aggregation.

Question 437: Which of the following vaccines is not included in the Indradhanush Mission?

A. Diphtheria
B. Meningococci (Correct Answer)
C. Tuberculosis
D. Tetanus

Explanation: ***Meningococci (Correct Answer)*** - The **meningococcal vaccine** is **NOT included** in the routine **Mission Indradhanush** immunization schedule. - Mission Indradhanush focuses on seven core vaccine-preventable diseases: **Diphtheria, Pertussis, Tetanus, Polio, Tuberculosis, Measles, and Hepatitis B**. - Meningococcal vaccination is administered only in **epidemic-prone areas** or during **outbreak response**, not as part of routine universal immunization. *Diphtheria (Incorrect)* - **Diphtheria vaccine** is a core component of **Mission Indradhanush**, included in the **Pentavalent vaccine (DPT-Hib-HepB)**. - It protects against this serious bacterial infection causing breathing difficulties, heart failure, paralysis, and death. *Tetanus (Incorrect)* - The **tetanus vaccine** is fundamental to Mission Indradhanush's immunization strategy, given as part of **Pentavalent vaccine** to children and **TT vaccine** to pregnant women. - It prevents **tetanus**, a life-threatening disease causing muscle spasms and "lockjaw." *Tuberculosis (Incorrect)* - The **BCG (Bacillus Calmette-Guérin) vaccine** for **tuberculosis** is a key vaccine in **Mission Indradhanush**. - Given at birth or as early as possible, it protects against severe forms of TB, particularly **TB meningitis and miliary TB** in infants and young children.

Question 438: During a measles outbreak, what is the most critical factor in controlling the spread of the disease?

A. Quarantine of infected individuals
B. Mass vaccination (Correct Answer)
C. Distribution of antibiotics
D. Health education campaigns

Explanation: ***Mass vaccination*** - Measles is highly contagious and spreads rapidly; **mass vaccination** is the most effective public health measure to quickly establish herd immunity and halt transmission. - This intervention directly targets population susceptibility by increasing the proportion of **immune individuals**, thereby breaking chains of transmission. *Quarantine of infected individuals* - While important for limiting exposure, **quarantine alone** is often insufficient to control a widespread measles outbreak due to the long incubation period and asymptomatic shedding. - It works best in conjunction with other measures but cannot replace the broad protective effect of widespread immunity. *Distribution of antibiotics* - Measles is caused by a **virus**, making antibiotics ineffective against the primary infection itself. - Antibiotics are only used to treat **secondary bacterial infections**, such as pneumonia or otitis media, which can complicate measles. *Health education campaigns* - **Health education** is crucial for increasing awareness and promoting vaccination but does not provide immediate immunity or directly stop viral transmission. - Its effectiveness is long-term and relies on individuals acting upon the information, which makes it less immediate than mass vaccination in an acute outbreak.

Question 439: What role does the Pulse Polio program play in India?

A. To ensure adult immunization against Hepatitis B
B. To provide measles vaccination
C. To eradicate polio by immunizing children under five (Correct Answer)
D. To control dengue through community mobilization

Explanation: ***To eradicate polio by immunizing children under five*** - The **Pulse Polio program in India** is a massive immunization campaign aimed specifically at **eradicating poliomyelitis** from the country. - Its primary strategy involves administering oral polio vaccine (**OPV**) to all children under the age of five during national and sub-national immunization rounds. *To ensure adult immunization against Hepatitis B* - Adult immunization against **Hepatitis B** is typically part of routine vaccination schedules for at-risk groups or as part of broader public health initiatives, not the specific focus of the Pulse Polio program. - The Pulse Polio program exclusively targets **polio prevention** in children. *To provide measles vaccination* - **Measles vaccination** is provided through the Universal Immunization Program (UIP) in India, which includes several routine childhood vaccines. - While essential, measles vaccination is a separate public health initiative from the **polio eradication campaign**. *To control dengue through community mobilization* - **Dengue control** involves vector control measures, public awareness campaigns, and community participation to eliminate mosquito breeding sites. - This is an environmental and vector-borne disease control strategy, entirely distinct from an immunization program focused on polio.

Question 440: What types of HPV does the GARDASIL vaccine protect against?

A. HPV 16,18
B. HSV
C. HPV 6,11,16,18 (Correct Answer)
D. Hepatitis B

Explanation: ***HPV 6,11,16,18*** - The **original GARDASIL vaccine** is quadrivalent, protecting against four types of HPV: **6, 11, 16, and 18**. - **HPV 6 and 11** are responsible for most cases of **genital warts**, while **HPV 16 and 18** cause about 70% of **cervical cancers** and a significant percentage of other anogenital cancers. *HPV 16,18* - While GARDASIL protects against **HPV 16 and 18**, which are high-risk types associated with cancer, it also covers types responsible for genital warts. - This option is incomplete as it misses the low-risk types covered by the original quadrivalent vaccine. *HSV* - **Herpes Simplex Virus (HSV)** is an entirely different virus from HPV and causes herpes. - GARDASIL provides no protection against HSV or any other sexually transmitted infections other than specific HPV types. *Hepatitis B* - **Hepatitis B virus** causes liver infection and is a completely distinct pathogen from Human Papillomavirus. - There is a separate vaccine for Hepatitis B, and GARDASIL offers no cross-protection against it.

Practice by Chapter

Principles of Immunization

Practice Questions

Types of Vaccines

Practice Questions

Universal Immunization Program

Practice Questions

Cold Chain System

Practice Questions

Vaccine Storage and Handling

Practice Questions

Adverse Events Following Immunization

Practice Questions

National Immunization Schedule

Practice Questions

Polio Eradication

Practice Questions

Measles Elimination

Practice Questions

Tetanus Control

Practice Questions

New and Underutilized Vaccines

Practice Questions

Vaccination Coverage Assessment

Practice Questions

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