Adverse Events Following Immunization — MCQs
What are the possible mild reactions after receiving the influenza vaccine?
Adverse reactions following whole cell pertussis immunization include:
Neurological complications following rabies vaccine are common with
Aedes aegypti index at airport -
An event that is caused by an error in vaccine preparation, handling, or administration is called as:
Which of the following diseases is primarily monitored under the Integrated Disease Surveillance Program (IDSP)?
According to Hill's criteria, which of the following is NOT a criterion for establishing causality in noncommunicable diseases?
The difference between the incidence in the exposed and non-exposed group is best given by:
Which is the first step in carrying out an Adverse Event Following Immunization (AEFI)?
Smallpox eradication was not due to:
Adverse Events Following Immunization Indian Medical PG Practice Questions and MCQs
Question 1: What are the possible mild reactions after receiving the influenza vaccine?
- A. Itching
- B. Local swelling
- C. Fever
- D. All of the options (Correct Answer)
Explanation: ***All of the options*** - All three reactions listed (local swelling, fever, and itching) are recognized **mild side effects** of the influenza vaccine. - **Local reactions** such as swelling, soreness, redness, and itching at the injection site are common and typically resolve within 1-2 days. - **Systemic reactions** like low-grade fever, headache, malaise, and muscle aches can occur as the immune system responds to the vaccine, usually lasting 1-2 days. - Since all the individual options represent possible mild reactions, the correct answer encompasses all of them. *Why individual options alone are incomplete* - Selecting only "Local swelling," "Fever," or "Itching" would be medically accurate but incomplete, as the question asks for "possible mild reactions" (plural). - Each individual option represents only one type of mild reaction, while multiple types can occur. - The most comprehensive and correct answer includes all possible mild reactions listed.
Question 2: Adverse reactions following whole cell pertussis immunization include:
- A. Fever
- B. Local swelling
- C. Excessive cry
- D. All of the options (Correct Answer)
Explanation: ***All of the options*** - **Whole-cell pertussis vaccines** are associated with a range of common, generally self-limiting adverse reactions. - These include systemic effects like **fever** and irritability, often manifested by excessive crying, as well as local reactions at the injection site. *Fever* - **Fever** is a very common systemic adverse reaction following whole-cell pertussis immunization, indicating the body's immune response. - This reaction typically resolves within 24-48 hours. *Excessive cry* - **Excessive crying** (often described as inconsolable crying) for several hours is a known systemic adverse effect of whole-cell pertussis vaccines. - This symptom usually reflects irritability and discomfort experienced by the infant. *Local swelling* - **Local swelling** at the injection site, along with redness and tenderness, is a frequent local adverse reaction to whole-cell pertussis immunization. - These local reactions are generally mild and self-limiting, resolving within a few days.
Question 3: Neurological complications following rabies vaccine are common with
- A. HDCS Vaccine
- B. Chick embryo Vaccine
- C. Semple Vaccine (Correct Answer)
- D. Duck Egg Vaccine
Explanation: ***Semple Vaccine*** - The **Semple vaccine (nerve tissue vaccine)** is associated with a higher incidence of **neurological complications** due to sensitisation to neural tissue components. - These complications can include **demyelinating encephalomyelitis** and paralysis, making it a less safe option compared to modern vaccines. *HDCS Vaccine* - The **Human Diploid Cell Vaccine (HDCV)** is a modern, highly purified rabies vaccine with a significantly **lower risk of neurological complications**. - It is considered one of the **safest and most effective** rabies vaccines available, rarely causing severe adverse events. *Chick embryo Vaccine* - **Chick embryo vaccines (CEV)** are produced in avian embryos and generally have a **low incidence of neurological complications** compared to nerve tissue vaccines. - While safer than older formulations, they are typically less used now than cell culture vaccines. *Duck Egg Vaccine* - **Duck embryo vaccines (DEV)** were an improvement over nerve tissue vaccines, offering a **reduced risk of neurological side effects**. - However, they still carried a slightly higher risk of adverse reactions compared to modern cell culture-derived vaccines.
Question 4: Aedes aegypti index at airport -
- A. 1
- B. 0
- C. 1-2
- D. <1 (Correct Answer)
Explanation: ***Correct: <1 (Less than 1)*** - The **Aedes aegypti index** at an airport should ideally be **less than 1** to prevent the introduction and spread of mosquito-borne diseases like dengue, yellow fever, and Zika. - A low index indicates effective mosquito control measures are in place, minimizing the risk of disease transmission. - This is the **standard recommended by WHO** and International Health Regulations (IHR) for airports and ports. *Incorrect: 1* - An index of **1** suggests that **1% of the premises** surveyed have Aedes aegypti larvae or pupae. - While seemingly low, this percentage could still pose a risk for disease transmission, especially in a high-traffic area like an airport. - This exceeds the acceptable threshold for vector control at international points of entry. *Incorrect: 0* - An index of **0** would mean no Aedes aegypti breeding sites were found, indicating an ideal but often **practically unachievable state** due to environmental factors and constant human activity. - While desirable, maintaining a zero index might be **economically and operationally challenging** in a large, dynamic environment like an airport. *Incorrect: 1-2* - An index of **1-2** indicates that 1% to 2% of premises have breeding sites, which is considered an **unacceptable risk** for an airport. - At this level, there is a **significant potential** for the introduction and establishment of Aedes-borne diseases, violating international health standards.
Question 5: An event that is caused by an error in vaccine preparation, handling, or administration is called as:
- A. Programme error (Correct Answer)
- B. Injection reaction
- C. Coincidental event
- D. Vaccine reaction
Explanation: ***Programme error*** - A **programme error** refers to an unintended event that occurs due to mistakes in **vaccine handling, storage, preparation, or administration**, rather than an inherent property of the vaccine itself. - This type of error can lead to **adverse events** ranging from local reactions (e.g., abscesses) to systemic effects if the vaccine is improperly prepared or administered (e.g., incorrect site, dose, or expired product). *Injection reaction* - An **injection reaction** is a common, mild, and usually transient side effect directly caused by the **injection process** itself, regardless of the vaccine substance. - Examples include **pain, redness, or swelling** at the injection site, or fainting due to anxiety (vasovagal syncope), which are expected reactions and not due to a preparation error. *Coincidental event* - A **coincidental event** is an adverse health event that happens to occur **around the time of vaccination** but is not causally related to the vaccine or the vaccination process. - These events would have occurred regardless of vaccination and are often related to **pre-existing conditions** or other independent factors. *Vaccine reaction* - A **vaccine reaction** (or vaccine adverse event) is an adverse effect inherently caused by the **vaccine's biological properties** when administered correctly. - This refers to the body's expected immune or physiological response to the vaccine components, such as **fever, malaise, or mild localized swelling**, not errors in administration.
Question 6: Which of the following diseases is primarily monitored under the Integrated Disease Surveillance Program (IDSP)?
- A. Tuberculosis
- B. HIV
- C. Malaria (Correct Answer)
- D. Diabetes
Explanation: ***Malaria*** - Malaria is a significant public health concern with high incidence and mortality, making its surveillance crucial for **disease control and elimination efforts**. - The IDSP aims for early detection and rapid response to **outbreaks of communicable diseases**, including vector-borne diseases like malaria. *Tuberculosis* - While a major public health issue, **tuberculosis (TB)** is primarily monitored under the **National Tuberculosis Elimination Programme (NTEP)**, which has a dedicated and extensive surveillance system. - The NTEP focuses on active case finding, treatment, and prevention of TB through a specific, robust framework separate from the IDSP's general surveillance. *HIV* - **HIV/AIDS** surveillance is conducted under the **National AIDS Control Organisation (NACO)**, which has a specialized program for monitoring prevalence, incidence, and risk behaviors. - NACO's surveillance includes sentinel surveillance among specific populations and programmatic data collection, distinct from the IDSP's generalized infectious disease monitoring. *Diabetes* - **Diabetes** is a **non-communicable disease** and is not primarily monitored under the IDSP, which focuses on infectious disease outbreaks. - Surveillance for non-communicable diseases like diabetes typically falls under programs dedicated to non-communicable disease prevention and control, focusing on prevalence and risk factors.
Question 7: According to Hill's criteria, which of the following is NOT a criterion for establishing causality in noncommunicable diseases?
- A. Strength of association
- B. Absence of temporal sequence (Correct Answer)
- C. Dose response relationship
- D. Specificity of association
Explanation: ***Absence of temporal sequence*** - A crucial criterion for establishing causality is the **presence of a temporal sequence**, meaning the exposure must precede the outcome. - The **absence of a temporal sequence** would argue directly against causality, as the cause cannot come after the effect. *Strength of association* - This criterion suggests that a **stronger statistical association** between an exposure and an outcome makes a causal relationship more likely. - A large **relative risk** or **odds ratio** indicates a strong association. *Dose response relationship* - This criterion implies that as the **amount or duration of exposure increases**, the **risk or severity of the outcome also increases**. - This **dose-response gradient** strengthens the argument for a causal link. *Specificity of association* - This criterion suggests that a single exposure leads to a **specific effect**, and not a wide range of unrelated effects. - While helpful, **lack of specificity does not rule out causality**, as many exposures can have multiple effects.
Question 8: The difference between the incidence in the exposed and non-exposed group is best given by:
- A. Attributable risk (Correct Answer)
- B. Population attributable risk
- C. Odds ratio
- D. Relative risk
Explanation: ***Attributable risk*** - **Attributable risk** (AR), also known as risk difference, directly quantifies the absolute difference in disease incidence between an **exposed group** and an **unexposed group**. - It represents the amount of disease incidence (or risk) in the exposed group that is **directly attributable to the exposure**, assuming a causal relationship. *Population attributable risk* - **Population attributable risk** (PAR) measures the proportion of disease incidence in the **total population** that is attributable to the exposure. - It takes into account both the impact of the exposure and the **prevalence of the exposure** in the population, which is distinct from simply comparing exposed and non-exposed groups. *Odds ratio* - The **odds ratio** (OR) is a measure of association between an exposure and an outcome, representing the **odds of an outcome occurring in the exposed group** compared to the odds of it occurring in the unexposed group. - It does not directly express the difference in incidence but rather the **ratio of odds**, often used in case-control studies. *Relative risk* - **Relative risk** (RR), or risk ratio, is the ratio of the **incidence of an outcome in the exposed group** to the incidence in the unexposed group. - It indicates how many times more likely an exposed group is to develop the outcome compared to an unexposed group, expressing a **ratio rather than a difference**.
Question 9: Which is the first step in carrying out an Adverse Event Following Immunization (AEFI)?
- A. Confirm information in report (Correct Answer)
- B. Collect data about the suspected vaccine
- C. Observe the immunization service in action
- D. Formulate a working hypothesis
Explanation: ***Confirm information in report*** - The initial and crucial step is to **verify the accuracy and completeness of the reported information** to ensure reliable data for further investigation. - This involves checking details such as the **patient's demographics, vaccine administered, date of vaccination, and the reported adverse event** itself. *Collect data about the suspected vaccine* - While essential for an AEFI investigation, **collecting specific vaccine data comes after confirming the initial report**, as you first need a verified event to investigate. - This step focuses on the **vaccine's batch number, expiry date, and manufacturer**, which are vital for causality assessment but not the very first action. *Observe the immunization service in action* - **Observing the immunization service** is a step that might be taken later in an investigation if a program error or procedural issue is suspected, not the immediate first step for an individual AEFI. - This helps identify **potential programmatic errors** in vaccine administration or storage, which is a downstream investigative measure. *Formulate a working hypothesis* - **Formulating a working hypothesis** is part of the analytical phase of an AEFI investigation, which occurs after initial data collection and confirmation, not as the very first step. - A hypothesis guides further investigation into potential causes but requires **initial confirmed data** to be meaningful.
Question 10: Smallpox eradication was not due to:
- A. Highly effective vaccine
- B. Cross-immunity with animal pox virus (Correct Answer)
- C. Subclinical infections do not transmit the disease
- D. Life long immunity
Explanation: ***Cross-immunity with animal pox virus*** - While cowpox provided the basis for the smallpox vaccine, **cross-immunity with naturally circulating animal pox viruses** did not contribute to the eradication of smallpox itself. - The eradication was achieved through targeted vaccination campaigns with a **human-specific vaccine**, not by incidental cross-protection from wildlife. *Highly effective vaccine* - The smallpox vaccine was highly effective, providing **strong and long-lasting immunity** against the Variola virus. - This effectiveness was crucial for establishing herd immunity and breaking the chains of transmission. *Subclinical infections do not transmit the disease* - Individuals infected with smallpox either developed **symptomatic disease** or were **immune/resistant** to infection. - The absence of asymptomatic carriers who could silently transmit the virus made it feasible to interrupt transmission through targeted vaccination and surveillance. *Life long immunity* - Both natural infection and successful vaccination provided **long-lasting, often lifelong immunity** to smallpox. - This durable immunity prevented reinfection and helped sustain the protection achieved through vaccination campaigns over time.
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