NEET-PG 2012 - Community Medicine Practice Questions

Q: What is the term for the time between infection and maximum infectivity?

Generation time. ***Generation time*** - This is the **time interval** between receipt of infection by a host and the moment of **maximum infectivity** of that same host. - It is a crucial parameter in epidemiology for understanding **disease transmission dynamics** and the speed at which an epidemic can spread. *Incubation period* - This refers to the time from **exposure to an infectious agent** until the **onset of symptoms**. - It does not directly account for the timing of viral shedding or peak infectivity. *Serial interval* - This is the time between **symptom onset in a primary case** and **symptom onset in a secondary case** it infects. - While related to transmission, it focuses on symptomatic presentation rather than peak infectivity. *Communicable period* - This is the time during which an infected individual is **capable of transmitting** the infectious agent to others. - It represents the entire duration of potential transmission, not specifically the peak infectivity.

Q: Which cancer type has the most effective screening procedure?

Cervical Cancer. ***Cervical Cancer*** - **Pap smear and HPV testing** represent the most effective cancer screening program, with proven reduction of **>70% in cervical cancer incidence and mortality**. - Screening detects **pre-cancerous lesions (CIN)** during the long latent period, allowing for effective intervention before cancer develops. - Well-established guidelines with high sensitivity, specificity, and cost-effectiveness make it a **public health success story**. - Particularly relevant in Indian context where cervical cancer burden is high and screening programs are being expanded. *Colon Cancer* - **Colonoscopy** and **fecal occult blood testing (FOBT)** are highly effective, allowing direct visualization and removal of precancerous polyps. - While very effective with proven mortality reduction, screening uptake is lower and the procedure is more invasive than cervical cancer screening. - Effectiveness is comparable but cervical cancer screening has achieved greater population-level impact historically. *Prostate Cancer* - Screening with **PSA (prostate-specific antigen) testing** and **digital rectal exam (DRE)** is controversial due to potential for **overdiagnosis and overtreatment** of indolent cancers. - Impact on overall mortality reduction is debated, and it doesn't prevent cancer through detection of precancerous lesions like cervical/colon cancer screening. *Gastric Cancer* - **Gastric cancer screening** is not routinely recommended in most countries including India due to lower prevalence and lack of a highly effective, non-invasive screening method. - **Endoscopy** can detect gastric cancer but is typically performed in symptomatic individuals or high-risk populations (e.g., Japan, Korea), not as a general population screening tool.

Q: Which vaccine is used to prevent cholera?

WC-rBS. ***WC-rBS*** * **WC-rBS** stands for **whole-cell, recombinant B subunit** vaccine, also known as **Dukoral**. * It is an **oral inactivated vaccine** containing killed *Vibrio cholerae* O1 bacteria and the recombinant B subunit of the cholera toxin, providing immunity against cholera. * **WC-rBS is the WHO-prequalified cholera vaccine** widely used in India and recommended for travellers and in epidemic settings. * It provides protection against both O1 and O139 serogroups and offers some cross-protection against ETEC (enterotoxigenic *E. coli*). *CVD 103-HgR* * **CVD 103-HgR** (commercially known as **Vaxchora**) is an **oral live-attenuated cholera vaccine** approved by the FDA. * It is a genetically modified *Vibrio cholerae* O1 Inaba strain with deleted cholera toxin genes. * While this is also a cholera vaccine, **it is primarily used in the United States** and is not the standard vaccine used in India or recommended by WHO for mass vaccination campaigns. * In the Indian context and for NEET-PG examinations, **WC-rBS (Dukoral) is the recognized cholera vaccine**. *Ty21a* * **Ty21a** is an **oral live-attenuated vaccine** used to prevent **typhoid fever**. * It is specifically designed to target *Salmonella Typhi* bacteria, not *Vibrio cholerae*. *None of the options* * This option is incorrect because WC-rBS is the well-established and WHO-recommended vaccine for the prevention of cholera in the Indian context.

Q: What is the concentration of type 3 virus in the trivalent oral polio vaccine?

600,000 TCID 50. ***600,000 TCID 50*** - The **trivalent oral polio vaccine (tOPV)** traditionally contained specific concentrations of each serotype: **type 1 (1,000,000 TCID50/dose)**, **type 2 (100,000 TCID50/dose)**, and **type 3 (600,000 TCID50/dose)**. - Type 3 poliovirus requires a **higher concentration (600,000 TCID50)** compared to type 2 to achieve adequate immunogenicity and protection. - The **World Health Organization (WHO)** established these specific formulations for tOPV to ensure optimal efficacy and safety for each serotype. *100,000 TCID 50* - This is the concentration of **type 2 poliovirus** in tOPV, not type 3. - Due to the **global eradication of wild poliovirus type 2** by 2015, tOPV was replaced with bivalent OPV (bOPV) containing only types 1 and 3 in routine immunization programs. *400,000 TCID 50* - This concentration does not correspond to any standard poliovirus serotype in the traditional trivalent oral polio vaccine. - This value falls between type 2 (100,000) and type 3 (600,000) concentrations but is not used. *300,000 TCID 50* - This concentration is not the standard for any poliovirus serotype in the traditional trivalent oral polio vaccine. - Each serotype has a **distinct, empirically determined concentration** to achieve optimal immunity while minimizing adverse effects.

Q: What is the role of iodized salt in the iodine deficiency control programme?

Primary prevention of iodine deficiency. ***Primary prevention of iodine deficiency*** - **Iodized salt** is a population-wide strategy to ensure adequate **iodine intake** in communities, preventing deficiency before it even occurs. - It aims to maintain normal **thyroid hormone** production and prevent disorders like **goiter** and **cretinism** in healthy individuals. *Secondary prevention of iodine deficiency* - **Secondary prevention** focuses on early diagnosis and prompt treatment in individuals already showing signs of a disease to prevent progression. - While screening for **iodine deficiency disorders (IDD)** might be secondary prevention, the universal use of iodized salt is not targeted at already deficient individuals but at the entire population. *Tertiary prevention of iodine deficiency* - **Tertiary prevention** involves managing existing conditions to prevent complications, reduce disability, and improve quality of life after a disease has manifested. - This would involve treating conditions like **severe hypothyroidism** or **cretinism** that result from prolonged iodine deficiency, for which **iodized salt** is not a direct treatment but a preventative measure. *Not applicable* - This option is incorrect as **iodized salt** plays a crucial and well-established role in public health for controlling **iodine deficiency**. - The scientific evidence and public health initiatives globally highlight its significant applicability in preventing **iodine deficiency disorders**.

Q: In pediatric growth assessment, what is the typical relationship observed between height and weight in healthy children?

Positive Correlation. ***Positive Correlation*** - In healthy children, as **height increases**, **weight generally also increases** in a predictable pattern, demonstrating a **positive correlation** between these two variables. - This is a fundamental aspect of normal pediatric growth, where both height and weight increase together as children develop. - The **correlation coefficient** between height and weight in healthy children is typically **strong and positive** (r > 0.7). *Negative Correlation* - A **negative correlation** would imply that as height increases, weight decreases, which contradicts normal growth patterns in healthy children. - This relationship might be observed in certain pathological conditions (e.g., severe malnutrition with stunting) but is not characteristic of normal development. *No Correlation* - Stating **no correlation** would mean that changes in height have no predictable linear relationship with changes in weight, which contradicts well-established growth data. - Height and weight are both key anthropometric indicators that are inherently linked during normal growth. *Inverse Relationship* - An **inverse relationship** is synonymous with a negative correlation, suggesting that as one variable increases, the other decreases. - This is incorrect for normal pediatric growth, where height and weight generally trend upwards together throughout childhood.

Q: National Leprosy Eradication Programme was started in -

1983. **Correct: 1983** - The **National Leprosy Eradication Programme (NLEP)** was launched in India in **1983** - Its goal was to eliminate leprosy as a public health problem by reducing its prevalence rate to less than 1 case per 10,000 population - This marked the shift from control to eradication strategy with the introduction of **Multi-Drug Therapy (MDT)** *Incorrect: 1949* - This year is not associated with the inception of a national leprosy eradication program in India - While efforts against leprosy existed, a comprehensive national program was not established at this time *Incorrect: 1955* - The **National Leprosy Control Programme (NLCP)** was launched in India in **1955** - This was a control program, preceding the eradication program, focusing on diagnosis and treatment with Dapsone monotherapy - NLCP was later upgraded to NLEP in 1983 *Incorrect: 1973* - This year is not cited as the start date for the national leprosy eradication program in India - The focus shifted from control to eradication in 1983 with the adoption of WHO-recommended MDT

Q: Multi-purpose worker scheme in India was introduced following the recommendation of ?

Kartar Singh Committee. ***Kartar Singh Committee*** - The **Kartar Singh Committee** (1973) recommended the implementation of the **multi-purpose worker scheme** in India. - This scheme aimed to integrate several health services at the grassroots level through a single health worker. *Srivastava Committee* - The **Srivastava Committee** (1975) focused on the creation of a **Medical and Health Education Commission** to reform medical education. - It did not specifically recommend the multi-purpose worker scheme. *Bhore Committee* - The **Bhore Committee** (1946), also known as the Health Survey and Development Committee, recommended a comprehensive health service with an emphasis on preventive and curative care. - It laid conceptual groundwork for primary healthcare but did not specifically propose the multi-purpose worker scheme, which came much later. *Chadha Committee* - The **Chadha Committee** (1963) reviewed India's health infrastructure and medical education. - It focused on health center development and medical college expansion, not the multi-purpose worker scheme.

Q: What is the primary strategy of the Iodine Deficiency Control Programme?

Fortification of salt. ***Fortification of salt*** - **Iodization of salt** is the most cost-effective and widely implemented strategy globally to prevent and control iodine deficiency disorders (IDDs), ensuring a consistent intake of iodine in the population. - This public health intervention targets a staple food item, making it accessible to a broad population regardless of socioeconomic status. - **India's National Iodine Deficiency Disorders Control Programme (NIDDCP)** mandates universal salt iodization as the primary strategy. *Health education* - While important for promoting the consumption of iodized salt and understanding the benefits, it is a **supportive measure** rather than the primary strategy for ensuring widespread iodine intake. - Health education alone cannot guarantee the universal availability and consumption of iodine, especially in areas where iodized salt is not readily supplied. *Water testing* - **Testing water for iodine content** is not a primary strategy as water is generally not a significant source of dietary iodine, and iodine deficiency is primarily addressed through food fortification. - Water quality testing is typically for contaminants and minerals affecting health, not specifically for iodine deficiency control. *Iodine supplementation* - While supplementation (iodized oil capsules) is used in **specific high-risk groups** or areas with severe deficiency, it is not sustainable as a universal primary strategy. - Supplementation requires active distribution and monitoring, making it less cost-effective than salt fortification for population-wide coverage.

Question 1

What is the term for the time between infection and maximum infectivity?

Accepted Answer

Generation time

Answer

Communicable period

Answer

Incubation period

Answer

Serial interval

Question 2

Which cancer type has the most effective screening procedure?

Accepted Answer

Cervical Cancer

Answer

Prostate Cancer

Answer

Colon Cancer

Answer

Gastric Cancer

Question 3

Which vaccine is used to prevent cholera?

Accepted Answer

WC-rBS

Answer

CVD 103-HgR

Answer

Ty21 A

Answer

None of the options

Question 4

What is the concentration of type 3 virus in the trivalent oral polio vaccine?

Accepted Answer

600,000 TCID 50

Answer

400,000 TCID 50

Answer

100,000 TCID 50

Answer

300,000 TCID 50

Question 5

What is the role of iodized salt in the iodine deficiency control programme?

Accepted Answer

Primary prevention of iodine deficiency

Answer

Secondary prevention of iodine deficiency

Answer

Tertiary prevention of iodine deficiency

Answer

Not applicable

Question 6

In pediatric growth assessment, what is the typical relationship observed between height and weight in healthy children?

Accepted Answer

Positive Correlation

Answer

Negative Correlation

Answer

No Correlation

Answer

Inverse Relationship

Question 7

National Leprosy Eradication Programme was started in -

Accepted Answer

1983

Answer

1949

Answer

1955

Answer

1973

Question 8

Multi-purpose worker scheme in India was introduced following the recommendation of ?

Accepted Answer

Kartar Singh Committee

Answer

Srivastava Committee

Answer

Bhore Committee

Answer

Chadha Committee

Question 9

What is the primary strategy of the Iodine Deficiency Control Programme?

Accepted Answer

Fortification of salt

Answer

Health education

Answer

Water testing

Answer

Iodine supplementation

Question 10

In community medicine practice, what aspects are primarily studied to understand health outcomes?

Accepted Answer

Both individual health behaviors and community social factors

Answer

Individual health behaviors

Answer

Community health relationships

Answer

None of the above

NEET-PG 2012 — Community Medicine