NEET-PG 2012 — Community Medicine
98 Previous Year Questions with Answers & Explanations
Which of the following is NOT a key intervention implemented under the Reproductive and Child Health (RCH) programme?
Who is recognized as the father of public health?
What is the simplest and most commonly used measure of mortality?
Which toxin is primarily responsible for epidemic dropsy?
In a measles outbreak, measles vaccine can be given to infants at what age range:
Following are examples of human "dead end" diseases except -
School health checkup is primarily managed by which entity?
What is the common adulterant found in black pepper?
What is the most commonly reported bacterial sexually transmitted infection?
Which of the following best describes the concept where a suspected cause precedes the observed effect?
NEET-PG 2012 - Community Medicine NEET-PG Practice Questions and MCQs
Question 1: Which of the following is NOT a key intervention implemented under the Reproductive and Child Health (RCH) programme?
- A. Immunization
- B. ORS therapy
- C. Vitamin A supplementation
- D. Management of hypertension (Correct Answer)
Explanation: ***Management of hypertension*** - While important for overall health, the **management of non-communicable diseases (NCDs)** like hypertension is not a primary, direct focus of the **Reproductive and Child Health (RCH) programme**. - RCH programs primarily target interventions related to women's reproductive health, safe motherhood, and child survival. *Immunization* - **Immunization** is a cornerstone intervention of the RCH program, crucial for preventing major childhood diseases and improving child survival rates. - It directly contributes to reducing **infant and child mortality** by protecting against vaccine-preventable diseases. *ORS therapy* - **Oral Rehydration Solution (ORS) therapy** is a key intervention within the RCH program aimed at reducing child mortality due to diarrheal diseases. - It is effective in treating **dehydration** caused by diarrhea, a common cause of death in young children. *Vitamin A supplementation* - **Vitamin A supplementation** is an essential RCH intervention, particularly for children, to prevent **vitamin A deficiency**. - It plays a vital role in **boosting immunity**, preventing blindness, and reducing the severity of common childhood infections.
Question 2: Who is recognized as the father of public health?
- A. Edward Jenner
- B. John Snow (Correct Answer)
- C. James Lind
- D. Frederick Griffith
Explanation: ***John Snow*** - **John Snow** is widely recognized as the **father of epidemiology and modern public health** for his groundbreaking work in identifying the source of the 1854 Broad Street cholera outbreak in London. - He used **mapping and statistical analysis** to demonstrate that cholera was a waterborne disease, challenging the prevailing miasma theory. - His scientific approach to investigating disease patterns established the foundation for modern epidemiological methods and evidence-based public health interventions. *Edward Jenner* - **Edward Jenner** is known for his pioneering work on the **smallpox vaccine** in the late 18th century, which laid the foundation for immunology. - While his contributions were crucial for preventive medicine, his focus was on vaccination rather than broader public health and epidemiological investigation. *James Lind* - **James Lind** was a Scottish naval surgeon who conducted one of the first recorded controlled clinical trials, demonstrating that **citrus fruits cured scurvy** in the mid-18th century. - His work was significant for nutritional science and clinical trial methodology, but not for the comprehensive scope of public health and disease investigation. *Frederick Griffith* - **Frederick Griffith** was a British bacteriologist whose 1928 experiment with *Streptococcus pneumoniae* demonstrated the process of **bacterial transformation**, suggesting that genetic material could be transferred. - His work was foundational for molecular biology and genetics, not directly related to public health practices or epidemiology.
Question 3: What is the simplest and most commonly used measure of mortality?
- A. Crude death rate (Correct Answer)
- B. Case fatality rate
- C. Specific death rate
- D. Proportional mortality rate
Explanation: ***Crude death rate*** - This is the simplest and most commonly used measure because it reflects the **total number of deaths** in a population over a specified period, relative to the mid-period population. - Its calculation requires only the total number of deaths and the total population size, making it easily accessible and widely applicable for **general mortality comparisons**. *Case fatality rate* - This measures the **proportion of individuals diagnosed with a specific disease** who die from that disease, rather than overall mortality in a population. - It is often used to assess the **severity of a disease** and is not a general measure of mortality. *Proportional mortality rate* - This indicates the **proportion of all deaths due to a specific cause** or age group, rather than the overall death rate in the population. - It does not represent the absolute risk of dying and is influenced by the prevalence of other causes of death. *Specific death rate* - This measure calculates the death rate for a **particular subgroup** (e.g., age-specific, cause-specific, or sex-specific), making it more detailed but not the simplest or most commonly used overall measure. - While more precise for specific analyses, it requires more granular data than the crude death rate.
Question 4: Which toxin is primarily responsible for epidemic dropsy?
- A. BOAA
- B. Sanguinarine (from bloodroot) (Correct Answer)
- C. Aflatoxin B1
- D. Pyrrolizidine alkaloids
Explanation: ***Sanguinarine (from bloodroot)*** - **Sanguinarine** is an alkaloid found in *Argemone mexicana* (Mexican prickly poppy/bloodroot) seeds - Epidemic dropsy occurs when **argemone oil contaminates cooking oils** (especially mustard oil) - Causes **bilateral pitting edema**, **congestive cardiac failure**, **respiratory distress**, and **glaucoma** - Toxin damages **capillary permeability**, leading to fluid leakage and widespread edema - Major outbreaks documented in India, particularly in **Bengal (1998)** and **Delhi (1998)** *BOAA* - **BOAA** (β-N-Oxalylamino-L-alanine) is found in *Lathyrus sativus* (grass pea/khesari dal) - Causes **neurolathyrism**, characterized by **spastic paraplegia** (irreversible lower limb paralysis) - Affects the **motor neurons**, not vascular permeability - Clinically distinct from epidemic dropsy with **no edema or cardiac involvement** *Aflatoxin B1* - Produced by *Aspergillus flavus* and *Aspergillus parasiticus* fungi - Potent **hepatotoxin** and **hepatocarcinogen** - Causes **acute liver necrosis** and **hepatocellular carcinoma** - Not associated with edema or epidemic dropsy *Pyrrolizidine alkaloids* - Found in plants like *Heliotropium* and *Crotalaria* species - Cause **hepatic veno-occlusive disease** (sinusoidal obstruction syndrome) - Present with **hepatomegaly**, **ascites**, and **jaundice** - Liver pathology, not the widespread peripheral edema seen in epidemic dropsy
Question 5: In a measles outbreak, measles vaccine can be given to infants at what age range:
- A. 2-3 months
- B. 3-5 months
- C. 2-7 months
- D. 6-9 months (Correct Answer)
Explanation: ***6-9 months*** - During a **measles outbreak**, infants as young as **6 months** can receive an early dose of the measles vaccine to provide protection. - This early vaccination is crucial in high-risk situations, even though the standard first dose is typically given at **12-15 months** of age. *2-3 months* - Administering the measles vaccine at **2-3 months** is generally avoided because of the presence of persistent **maternal antibodies**. - These antibodies can interfere with the infant's immune response to the vaccine, making it less effective. *3-5 months* - Similar to the 2-3 month range, **maternal antibodies** are still likely present and at sufficiently high levels in infants aged 3-5 months. - This interference reduces the vaccine's efficacy and the likelihood of developing a robust, lasting immune response. *2-7 months* - While this range includes the accepted 6-month age for early vaccination, infants under **6 months** still pose a challenge due to **maternal antibody interference**. - Combining these ages into a single range doesn't differentiate between the reduced efficacy in younger infants versus the permissible early vaccination at 6 months and older during an outbreak.
Question 6: Following are examples of human "dead end" diseases except -
- A. Hydatid disease
- B. Japanese encephalitis
- C. Leishmaniasis
- D. Bubonic plague (Correct Answer)
Explanation: ***Bubonic plague (Plague)*** - The question refers to **plague in general**, which includes multiple clinical forms. - While **bubonic plague** (the most common form) is transmitted via **flea bites** from infected rodents and humans are typically dead-end hosts for this form, **pneumonic plague** (secondary complication or primary infection) allows **human-to-human transmission** via respiratory droplets. - This makes plague the **exception** among the listed diseases, as humans can serve as a source of infection to others in the pneumonic form, unlike true dead-end host situations. *Japanese encephalitis* - Humans are **dead-end hosts** for Japanese encephalitis virus. - Infected humans do not develop sufficient **viremia** to infect feeding mosquitoes. - The virus maintains its cycle between **Culex mosquitoes**, **pigs** (amplifying hosts), and **wading birds**, with humans being incidental hosts. *Hydatid disease* - Humans are **definitive dead-end hosts** for *Echinococcus granulosus* (causing cystic echinococcosis/hydatid disease). - The normal life cycle requires **definitive hosts** (dogs, canids) and **intermediate hosts** (sheep, cattle). - Humans develop **hydatid cysts** but cannot transmit the infection further as the parasite cannot complete its life cycle in humans. *Leishmaniasis* - In most forms of leishmaniasis, humans are considered **dead-end or accidental hosts**, particularly in **zoonotic cutaneous leishmaniasis** where animal reservoirs (rodents, dogs) maintain transmission. - However, in **anthroponotic visceral leishmaniasis** (*Leishmania donovani* in the Indian subcontinent), humans can serve as reservoir hosts. - For the purpose of this question, leishmaniasis is generally classified with dead-end diseases as the majority of leishmaniasis forms have zoonotic cycles where humans are incidental hosts with limited onward transmission.
Question 7: School health checkup is primarily managed by which entity?
- A. PHC (Correct Answer)
- B. CHC
- C. District hospital
- D. School health committee
Explanation: ***PHC (Primary Health Centre)*** - The **PHC is the primary entity responsible for managing school health checkups** in India as per the National Health Programs - The Medical Officer and health staff from the PHC conduct **periodic health examinations, immunizations, and screening programs** in schools within their jurisdiction - School health services are an integral component of the **MCH (Maternal and Child Health) services** provided by PHCs - The PHC maintains **health records of school children** and provides referral services for identified health problems *School health committee* - The School Health Committee plays a **coordinating and facilitating role** rather than primary management - It typically comprises school staff, parents, and local health representatives who help in **organizing logistics and follow-up** - While important for implementation, the committee does not conduct the actual medical examinations or manage the clinical aspects of health checkups *CHC* - The **Community Health Centre** serves as a referral center for PHCs and provides specialized services - Its role in school health is **secondary**, mainly providing referral services for cases requiring specialist consultation - CHCs do not directly conduct routine school health checkups *District hospital* - The **District Hospital** provides tertiary care and specialized medical services - Its involvement in school health is limited to **referral cases requiring advanced diagnostics or treatment** - It does not participate in routine primary management of school health checkup programs
Question 8: What is the common adulterant found in black pepper?
- A. Khesari dal
- B. Fine sand
- C. None of the options
- D. Dried papaya seeds (Correct Answer)
Explanation: ***Dried papaya seeds*** - **Dried papaya seeds** are a common adulterant in black pepper due to their similar size, shape, and color, making them difficult to distinguish visually. - Adulteration with papaya seeds is often done to increase the bulk and weight of the black pepper product, thereby reducing production costs. *Khesari dal* - **Khesari dal (Lathyrus sativus)** is a type of lentil known for causing **lathyrism**, a neurotoxic disorder, but it is not typically used to adulterate black pepper. - Its appearance and texture are distinctly different from black pepper, making it an unsuitable adulterant. *Fine sand* - **Fine sand** can be an adulterant in spices, but it is more commonly found in powdered spices like chilli powder or turmeric due to its fine particle size. - While it adds weight, its presence in whole black pepper would be easily detectable due to its abrasive texture and grittiness. *None of the options* - This option is incorrect because **dried papaya seeds** are a well-documented and common adulterant in black pepper. - The similarities in appearance make it a frequent choice for unscrupulous suppliers.
Question 9: What is the most commonly reported bacterial sexually transmitted infection?
- A. HSV
- B. HIV
- C. Syphilis
- D. Chlamydia (Correct Answer)
Explanation: ***Correct: Chlamydia*** - **Chlamydia trachomatis** is the most frequently reported bacterial STI in many countries, often being **asymptomatic** and thus easily spread - Its high prevalence is due to efficient transmission and the widespread use of sensitive diagnostic tests that detect infections in asymptomatic individuals - Accounts for the majority of reported bacterial STI cases globally *Incorrect: HSV* - **Herpes Simplex Virus (HSV)** is a **viral STI**, not bacterial, and is characterized by recurrent outbreaks of **genital ulcers** or sores - While common, it does not qualify as a bacterial infection and is often not laboratory-confirmed due to mild or subclinical presentations *Incorrect: HIV* - **Human Immunodeficiency Virus (HIV)** is also a **viral STI**, not bacterial, that attacks the immune system leading to AIDS - Although highly impactful, HIV is not a bacterial infection and has lower incidence rates compared to Chlamydia *Incorrect: Syphilis* - **Syphilis**, caused by the bacterium **Treponema pallidum**, is a serious bacterial STI that can have long-term complications if untreated - While its incidence has been increasing in some regions, it is significantly less common than **Chlamydia** in terms of overall reported cases
Question 10: Which of the following best describes the concept where a suspected cause precedes the observed effect?
- A. Temporal association (Correct Answer)
- B. Consistency of association
- C. Strength of association
- D. Coherence of association
Explanation: ***Temporal association*** - This principle in **causal inference** emphasizes that for a factor to be a cause, it must precede the effect. - In epidemiology, it's crucial to establish that exposure occurred **before the disease manifestation**. *Consistency of association* - Refers to the observation of a **similar association across different studies** and populations. - While important for causal inference, it does not directly address the timing of cause and effect. *Strength of association* - Quantifies how often the **exposure and outcome co-occur**, often measured by relative risk or odds ratio. - A strong association is more likely to be causal, but it doesn't confirm that the cause came before the effect. *Coherence of association* - Implies that the observed association should be **consistent with existing biological and medical knowledge**. - This criterion supports the plausibility of an association but doesn't specifically deal with the temporal sequence.