Epidemiology Practice Questions

Q: Chemoprophylaxis is __________ prevention.

Primary. ***Primary*** - **Primary prevention** aims to prevent disease or injury before it ever occurs, often through interventions like vaccination or lifestyle changes. - **Chemoprophylaxis** involves administering medication to prevent a disease from developing, thus aligning with the goal of preventing the initial onset. *Secondary* - **Secondary prevention** focuses on early detection and prompt treatment of existing disease to prevent progression or complications. - This typically involves screening tests or early interventions once a condition has already begun. *Tertiary* - **Tertiary prevention** aims to reduce the impact of an ongoing illness or injury that has lasting effects, often through rehabilitation or management to improve quality of life. - This level of prevention occurs when a disease is already advanced and aims to minimize disability or recurrence. *Primordial* - **Primordial prevention** is the earliest stage of prevention, targeting underlying social and environmental conditions that contribute to health risks, often at a population level. - It focuses on preventing the emergence of risk factors themselves, rather than preventing the disease in individuals.

Q: Infectious agent is transmitted to susceptible host from -

All of these. ***All of these*** - In epidemiology, an infectious agent can be transmitted to a susceptible host from **multiple origins** in the chain of infection. - **Source**: The person, animal, object, or substance from which an infectious agent passes immediately to a host (e.g., contaminated food, infected person, contaminated water). - **Reservoir**: The natural habitat where the infectious agent normally lives and multiplies (humans, animals, or environment) and from which it can be transmitted directly or indirectly to susceptible hosts. - **Carrier and Case**: Both are infected individuals who can directly transmit the agent - carriers harbor the pathogen without symptoms, while cases have clinical disease. - All these terms represent different aspects of where transmission originates, making **"All of these"** the most complete and accurate answer. *Carrier and Case* - While carriers and cases are important transmitters, this option is too narrow as it excludes other valid sources and reservoirs of transmission. - This would only be correct if the question specifically asked about transmission from infected **humans** only. *Source* - Alone, this is correct but incomplete, as it doesn't encompass the full epidemiological framework. - Sources include reservoirs, carriers, and cases. *Reservoir* - Alone, this is also correct but incomplete. - Reservoirs can be sources of infection, and infected humans (carriers/cases) can serve as reservoirs for human-adapted pathogens.

Q: All are modifiable risk factors except

Personality. ***Personality*** - **Personality traits**, such as Type A behavior, are **not directly modifiable** through lifestyle changes or medical interventions. - While coping mechanisms can be learned, the underlying personality structure is generally considered a **non-modifiable risk factor** for various health outcomes. *Weight* - **Weight** is a **modifiable risk factor** that can be changed through diet, exercise, and other lifestyle interventions. - Maintaining a **healthy weight** reduces the risk of numerous diseases, including cardiovascular disease and diabetes. *Cigarette smoking* - **Cigarette smoking** is a highly **modifiable risk factor** that can be completely eliminated by quitting. - Smoking cessation significantly reduces the risk of cancer, heart disease, and respiratory illnesses. *Diabetes* - **Established diabetes** is considered a **non-modifiable risk factor** for cardiovascular complications and other diseases in epidemiological classification. - While the **risk of developing diabetes** can be modified through lifestyle interventions, and **glycemic control** can be managed, the disease state itself once present is categorized as non-modifiable. - However, **Personality** is the more clearly non-modifiable factor among the options, as it represents an inherent trait rather than an acquired condition.

Q: The 2009 H1N1 influenza pandemic was classified by WHO under which pandemic phase?

phase 6. ***phase 6*** - The **WHO pandemic phase 6** signifies a **full-blown global pandemic**, characterized by widespread and sustained community-level outbreaks in at least one other region in addition to the original affected area. - The 2009 H1N1 influenza outbreak met these criteria, with sustained human-to-human transmission across multiple geographic regions, leading to its classification as a phase 6 pandemic. *phase 5* - **Phase 5** indicates that the influenza virus is causing sustained human-to-human transmission in **at least two countries** in one WHO region. - While this phase represents significant human spread, it does not yet reflect the global scale seen with H1N1 in 2009. *phase 4* - **Phase 4** is defined by documented human-to-human transmission that causes **community-level outbreaks**. - This stage signifies a significant increase in risk but is localized, not reflecting the widespread geographic distribution of the 2009 H1N1 pandemic. *phase 3* - In **phase 3**, there is evidence of human infection with a new influenza virus subtype, but with **no or very limited human-to-human transmission**. - This phase represents a lower level of pandemic threat compared to the 2009 H1N1 situation.

Q: The term 'Primary Prevention' includes all of the following except

Early detection and treatment of hypertension. ***Early detection and treatment of hypertension*** - This describes **secondary prevention**, which focuses on **early diagnosis and prompt treatment** of disease to prevent progression and complications. - Screening programs for hypertension and initiating treatment after detection aim to **interrupt the disease process** rather than prevent its initial occurrence. - Secondary prevention reduces the severity and complications of an existing condition. *Immunization against measles* - This is a classic example of **primary prevention** that prevents the initial occurrence of disease by building immunity before exposure. - Vaccination programs are the cornerstone of primary prevention in public health, protecting individuals before they contract the infection. *Health education about balanced diet* - Dietary counseling and nutrition education are **primary prevention** strategies that promote healthy behaviors and prevent the onset of nutrition-related disorders. - This includes preventing obesity, diabetes, cardiovascular diseases, and micronutrient deficiencies through appropriate dietary practices. *Provision of safe drinking water* - Ensuring access to safe water is a fundamental **primary prevention** measure that prevents waterborne diseases like cholera, typhoid, hepatitis A, and diarrheal diseases. - Environmental modifications to eliminate disease risk factors are key components of primary prevention in community medicine.

Q: The pattern of change in disease trends where infectious diseases are replaced by degenerative and non-communicable diseases as the main causes of morbidity and mortality is known as:

Epidemiological transition. ***Epidemiological transition*** - The **epidemiological transition** describes the shift in disease patterns from infectious diseases as leading causes of death to non-communicable, chronic, and degenerative diseases. - This transition is typically associated with **socioeconomic development**, improved public health, sanitation, and increased life expectancy. - It was first described by **Abdel Omran** in 1971 and includes three stages: the age of pestilence and famine, the age of receding pandemics, and the age of degenerative and man-made diseases. *Incorrect: Paradoxical transition* - This term is **not a recognized concept** in epidemiology. - It does not describe a systemic pattern of disease trend changes. *Incorrect: Demographic transition* - The **demographic transition** refers to changes in birth and death rates over time in a population, leading to shifts in age structure. - While related to epidemiological changes, it specifically describes **population dynamics**, not disease patterns themselves. - It typically precedes or accompanies epidemiological transition. *Incorrect: Cross transition* - This term is **not a recognized concept** in epidemiology. - It does not describe a systemic pattern of disease trend changes.

Q: The time interval between reception of infection and maximum infectivity of the host is known as-

Latent period. ***Latent period*** - This is the time from **infection to infectiousness**, meaning the period until the host can transmit the pathogen to another susceptible host. - The highest infectivity typically occurs during this period or shortly after its completion, making it a critical measure for understanding disease transmission. *Median incubation period* - The **incubation period** is the time from exposure to a pathogen until the first appearance of symptoms. - The median incubation period represents the **midpoint** of this time frame across an infected population. *Generation time* - **Generation time** is defined as the interval between the onset of infectiousness in a primary case and the onset of infectiousness in a secondary case infected by the primary case. - It measures the **time between successive generations of infection**, not the time to maximum infectivity within a single host. *Serial interval* - The **serial interval** is the time from symptom onset in a primary case to symptom onset in a secondary case infected by the primary case. - It is a measure related to the **spread of symptomatic illness**, and while often correlated with generation time, it is not specifically about the host's infectivity level.

Q: WER stands for

Weekly epidemiological record. ***Weekly epidemiological record*** - The **Weekly Epidemiological Record (WER)** is a key publication of the **World Health Organization (WHO)**. - It serves as an essential instrument for the rapid dissemination of **epidemiological information** on cases and outbreaks of diseases under the **International Health Regulations**. *World epidemic record* - This option is incorrect because while the WER deals with **epidemics**, the full and correct name emphasizes the **weekly publication schedule** and broader "epidemiological" scope, not just "epidemic." - Using "World epidemic record" is not the accepted or official nomenclature for the publication. *Weekly environmental record* - This option is incorrect as the **WER** focuses specifically on **disease surveillance** and **epidemiology**, not environmental data. - While environmental factors can influence disease, the primary scope of the WER is on disease prevalence, incidence, and outbreaks. *World epidemiological record* - This option is incorrect because the official publication is called the **"Weekly" Epidemiological Record**, highlighting its regular, week-by-week updates. - Omission of "Weekly" changes the accuracy of the title.

Question 1

A pandemic of H1N1 is suspected when?

Accepted Answer

Community-level outbreaks in at least two WHO regions

Answer

Increased and sustained transmission in the general population

Answer

At least one laboratory confirmed H1N1 case

Answer

Sustained human-to-human transmission in multiple WHO regions

Question 2

Chemoprophylaxis is __________ prevention.

Accepted Answer

Primary

Answer

Secondary

Answer

Tertiary

Answer

Primordial

Question 3

Infectious agent is transmitted to susceptible host from -

Accepted Answer

All of these

Answer

Reservoir

Answer

Carrier and Case

Answer

Source

Question 4

All are modifiable risk factors except

Accepted Answer

Personality

Answer

Weight

Answer

Cigarette smoking

Answer

Diabetes

Question 5

The 2009 H1N1 influenza pandemic was classified by WHO under which pandemic phase?

Accepted Answer

phase 6

Answer

phase 5

Answer

phase 4

Answer

phase 3

Question 6

Which of the following is true about annual risk of TB (ARI)

Accepted Answer

It is assessed by tuberculin conversion in previously non-vaccinated children

Answer

ARI of 1% = 50 new cases

Answer

It represents new cases of TB

Answer

Current ARI in India is 1.7%

Question 7

The term 'Primary Prevention' includes all of the following except

Accepted Answer

Early detection and treatment of hypertension

Answer

Health education about balanced diet

Answer

Immunization against measles

Answer

Provision of safe drinking water

Question 8

The pattern of change in disease trends where infectious diseases are replaced by degenerative and non-communicable diseases as the main causes of morbidity and mortality is known as:

Accepted Answer

Epidemiological transition

Answer

Paradoxical transition

Answer

Demographic transition

Answer

Cross transition

Question 9

The time interval between reception of infection and maximum infectivity of the host is known as-

Accepted Answer

Latent period

Answer

Median incubation period

Answer

Generation time

Answer

Serial interval

Question 10

WER stands for

Accepted Answer

Weekly epidemiological record

Answer

World epidemic record

Answer

Weekly environmental record

Answer

World epidemiological record

Epidemiology — MCQs

Epidemiology — MCQs

On this page

Practice by Chapter

Want unlimited practice?