Epidemiology Practice Questions

Q: Multifactorial causation of disease theory was proposed by whom?

Pettenkofer. ***Pettenkofer*** - **Pettenkofer** is associated with the idea that while a germ might be present, other **environmental factors** and host conditions play a crucial role in disease development. - He proposed that a specific **cause** was not sufficient by itself to produce disease, highlighting the importance of multiple contributing factors. *Louis Pasteur* - **Louis Pasteur** is famous for his work on the **germ theory of disease**, demonstrating that microorganisms cause disease. - His contributions primarily focused on identifying specific pathogens for specific diseases, which is a **unifactorial approach** rather than multifactorial. *Robert Koch* - **Robert Koch** further solidified the **germ theory** with his postulates, establishing criteria to prove that a specific organism causes a specific disease. - His work was also centered on identifying single causative agents, contrasting with the **multifactorial causation** theory. *Aristotle* - **Aristotle** was an ancient Greek philosopher who contributed to many fields, including early biological observations, but his theories predate modern understanding of disease causation. - He did not propose a modern **multifactorial causation of disease theory**; his work was foundational but not specific to this concept.

Q: Targeted screening for communicable diseases is most commonly implemented in which population?

Immigrant screening. ***Immigrant screening*** - Targeted screening for communicable diseases such as **tuberculosis**, **hepatitis B**, and **HIV** is commonly implemented in immigrants due to varied disease prevalence in their countries of origin and potential for public health impact. - This screening aims to **prevent the spread** of these diseases within the host country and ensure appropriate medical attention for new arrivals. *Newborns for thyroid disease* - This is an example of **universal newborn screening** for a **non-communicable disease** (congenital hypothyroidism), not targeted screening for communicable diseases. - The purpose is early detection of conditions that can cause **developmental delays** if untreated, not preventing infection spread. *Diabetes mellitus* - Screening for **diabetes** focuses on a **non-communicable metabolic disorder**. - Screening typically targets individuals with risk factors like obesity, family history, or certain ethnic backgrounds, but it's not for communicable diseases. *Cervical cancer screening with Pap smear* - This screens for **cancer** (a non-communicable disease) caused by the **human papillomavirus (HPV)**, but the screening itself is not primarily for a communicable disease. - The Pap smear primarily detects **precancerous and cancerous changes** in cervical cells, rather than active HPV infection or other communicable diseases.

Q: A drug that does not cure a disease but decreases its symptoms and increases survival leads to increased:

Increased prevalence. ***Increased prevalence*** - A drug that **decreases symptoms** and **increases survival** means people live longer with the disease. - This leads to more existing cases at any given time, thus **increasing prevalence**. *Increased incidence* - **Incidence** refers to the rate of new cases of a disease in a population over a specific period. - A drug that *palliates* symptoms and increases survival does not affect the rate at which new cases develop; therefore, it does not alter incidence. *Decreased prevalence* - **Decreased prevalence** would occur if fewer people had the disease or if people recovered or died more quickly. - Since the drug *increases survival*, it would lead to more people living with the disease for longer, thus increasing, not decreasing, prevalence. *Decreased incidence* - **Decreased incidence** means fewer new cases are occurring. - A palliative drug that extends life does not prevent new cases from arising and therefore does not decrease incidence.

Q: Which of the following attributes are essential for an ideal screening test?

All of the options. ***All of the options*** - An ideal screening test must possess **all three essential attributes**: safety, reliability, and validity. - **Safe**: Minimizes harm to participants and ensures ethical implementation - **Reliable**: Produces consistent, reproducible results with minimal random error - **Valid**: Accurately measures what it intends to measure (high sensitivity and specificity) - These three attributes work together as fundamental requirements for any effective screening program, ensuring that early detection benefits outweigh potential risks. *Safe (alone)* - While safety is absolutely essential, it is **not sufficient by itself** to make an ideal screening test. - A test that is safe but unreliable or invalid would produce inconsistent or inaccurate results, rendering it ineffective for screening purposes. *Reliable (alone)* - Reliability ensures consistent results, which is crucial, but **reliability alone is insufficient**. - A test can be highly reliable (consistently giving the same result) yet completely invalid if it measures the wrong thing or is unsafe. *Valid (alone)* - Validity is critical for accurate measurement, but **validity alone does not make a test ideal**. - Even a valid test must be safe to protect participants and reliable to ensure consistency across different settings and times.

Question 1

Multifactorial causation of disease theory was proposed by whom?

Accepted Answer

Pettenkofer

Answer

Aristotle

Answer

Robert Koch

Answer

Louis Pasteur

Question 2

What is the primary limitation of conducting a one-day census of inpatients in a mental hospital?

Accepted Answer

Provides a snapshot of the current patient demographic but lacks longitudinal data.

Answer

Gives reliable estimates of seasonal factors in admissions.

Answer

Allows for conclusions about the overall mental health trends in India.

Answer

Enables estimation of the distribution of different diagnoses over time.

Question 3

Targeted screening for communicable diseases is most commonly implemented in which population?

Accepted Answer

Immigrant screening

Answer

Newborns for thyroid disease

Answer

Diabetes mellitus

Answer

Cervical cancer screening with Pap smear

Question 4

A drug that does not cure a disease but decreases its symptoms and increases survival leads to increased:

Accepted Answer

Increased prevalence

Answer

Increased incidence

Answer

Decreased prevalence

Answer

Decreased incidence

Question 5

Which of the following attributes are essential for an ideal screening test?

Accepted Answer

All of the options

Answer

Safe

Answer

Reliable

Answer

Valid

Epidemiology — MCQs

Epidemiology — MCQs

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