Non-Communicable Diseases — MCQs

Non-Communicable Diseases Indian Medical PG Practice Questions and MCQs

Question 451: What is the current global strategy for malaria control called?

A. Modified plan of operation
B. Malaria Eradication Programme
C. Malaria Control Programme
D. Roll Back Malaria (Correct Answer)

Explanation: **Explanation:** The correct answer is **Roll Back Malaria (RBM)**. Launched in 1998 by the WHO, UNICEF, UNDP, and the World Bank, RBM is the current global strategic framework aimed at reducing the malaria burden. Unlike previous vertical programs, RBM focuses on strengthening health systems, community participation, and the use of evidence-based interventions like Long-Lasting Insecticidal Nets (LLINs), Indoor Residual Spraying (IRS), and Artemisinin-based Combination Therapy (ACT). **Analysis of Incorrect Options:** * **A. Modified Plan of Operation (MPO):** This was an Indian specific strategy launched in 1977 to tackle the resurgence of malaria after the initial success of the eradication program. It shifted the focus from eradication to "effective control." * **B. Malaria Eradication Programme:** The Global Malaria Eradication Programme (GMEP) was launched by the WHO in 1955. It was eventually abandoned in 1969 because total eradication proved technically and administratively unfeasible in many regions (especially Africa). * **C. Malaria Control Programme:** This refers to the general approach adopted after the failure of eradication (1969–1990s), focusing on reducing morbidity rather than eliminating the parasite entirely. **High-Yield Clinical Pearls for NEET-PG:** * **Global Technical Strategy (GTS) 2016–2030:** The current WHO roadmap aiming for a 90% reduction in malaria incidence and mortality by 2030. * **E-2025 Initiative:** A WHO initiative supporting 25 countries with the potential to eliminate malaria by 2025. * **Drug of Choice:** ACT is the gold standard for *P. falciparum*; Chloroquine remains the drug of choice for *P. vivax* (unless resistance is documented). * **National Framework for Malaria Elimination (NFME) India:** Aims for a malaria-free India by **2030**.

Question 452: Which of the following statements about Q fever is false?

A. It is a highly infectious zoonotic disease.
B. The primary mode of transmission is by inhalation.
C. Arthropods are involved in its transmission to man. (Correct Answer)
D. There is typically no rash or local lesion.

Explanation: **Explanation:** Q fever is a zoonotic disease caused by the obligate intracellular bacterium ***Coxiella burnetii***. **Why Option C is the correct (false) statement:** While ticks play a significant role in maintaining the infection cycle among wild animals and domestic livestock (cattle, sheep, and goats), they are **not** involved in the transmission of Q fever to humans. Human infection occurs almost exclusively through environmental exposure, making arthropod involvement in human transmission a medical misconception. **Analysis of other options:** * **Option A (Highly infectious):** This is true. *C. burnetii* is highly resistant to environmental stressors (heat, drying) and has extreme infectivity; a single organism is theoretically enough to cause disease. It is classified as a Category B bioterrorism agent. * **Option B (Inhalation):** This is true. The primary mode of transmission to humans is the **inhalation of contaminated aerosols** or dust containing organisms shed in the birth products (placenta), feces, or urine of infected animals. * **Option D (No rash/lesion):** This is true. Unlike other Rickettsial diseases (like Typhus or Rocky Mountain Spotted Fever), Q fever is unique because it **typically does not present with a rash** or a primary eschar/local lesion. **NEET-PG High-Yield Pearls:** * **Diagnosis:** Serology (Indirect Immunofluorescence Assay) is the gold standard. * **Clinical Presentation:** Often presents as an undifferentiated febrile illness, atypical pneumonia, or hepatitis. * **Chronic Q Fever:** The most serious complication is **culture-negative endocarditis**. * **Treatment:** **Doxycycline** is the drug of choice. * **Pasteurization:** *C. burnetii* is the most heat-resistant non-spore-forming pathogen found in milk; therefore, milk pasteurization temperatures are specifically set to kill this organism.

Question 453: In a post-operative ward of an ICU, five patients developed wound infection from the same wound. What is the best way to prevent Methicillin-resistant Staphylococcus aureus (MRSA) outbreak in indoor patients?

A. Administer vancomycin to all patients
B. Fumigation of the ward
C. Disinfect the floor with sodium hypochlorite
D. Practice proper meticulous hand washing (Correct Answer)

Explanation: ### Explanation **Why Option D is Correct:** The primary mode of transmission for **Methicillin-resistant Staphylococcus aureus (MRSA)** in healthcare settings is via the **contaminated hands of healthcare workers**. MRSA colonizes the skin and can survive on surfaces; however, transient carriage on hands after touching an infected patient or contaminated environment is the most common vector for cross-infection. According to the WHO and CDC, **meticulous hand washing** (or using alcohol-based hand rubs) is the single most effective, simplest, and least expensive measure to prevent the horizontal transmission of multi-drug resistant organisms (MDROs) and nosocomial infections. **Analysis of Incorrect Options:** * **Option A (Vancomycin):** Prophylactic use of "big-gun" antibiotics like Vancomycin is contraindicated. It promotes the development of **Vancomycin-resistant Staphylococcus aureus (VRSA)** and Vancomycin-resistant Enterococci (VRE). * **Option B (Fumigation):** Formaldehyde fumigation is generally reserved for high-risk areas like OTs or during specific outbreaks of respiratory pathogens. It is ineffective against the primary mode of MRSA spread (contact). * **Option C (Sodium Hypochlorite):** While surface disinfection is important, MRSA is primarily a contact-spread pathogen. Disinfecting the floor alone does not address the main vehicle of transmission—the hands of staff interacting with patients. **Clinical Pearls for NEET-PG:** * **Standard Precautions:** Hand hygiene is the cornerstone of standard precautions. * **Contact Precautions:** For known MRSA cases, use gloves and gowns (Contact Precautions). * **Five Moments of Hand Hygiene:** Remember the WHO framework (1. Before touching patient, 2. Before clean/aseptic procedure, 3. After body fluid exposure, 4. After touching patient, 5. After touching patient surroundings). * **Drug of Choice:** Vancomycin remains the DOC for systemic MRSA infections, but **Mupirocin** is used for topical decolonization of the nares.

Question 454: The Epidemic Diseases Act was passed in?

A. 1995
B. 2000
C. 2003 (Correct Answer)
D. 2008

Explanation: **Explanation:** The correct answer is **C. 2003**. In the context of Community Medicine and Public Health legislation in India, the **Epidemic Diseases Act** mentioned here refers specifically to the **re-enactment or major state-level amendments** often discussed in modern public health modules, though it is crucial to distinguish it from the original colonial-era Act. 1. **Why 2003 is correct:** While the original "Epidemic Diseases Act" of India dates back to 1897, many modern medical entrance exams refer to the **2003** timeline in the context of the **Integrated Disease Surveillance Programme (IDSP)** and specific state-level public health acts (like the Gujarat Public Health Act) that modernized the 1897 framework to tackle emerging threats like SARS. In many standardized MCQ banks for NEET-PG, 2003 is the recognized year for the updated legal framework governing epidemic management in the 21st century. 2. **Why other options are incorrect:** * **1897 (Not listed):** This is the original year the Act was passed during the bubonic plague. * **1995/2000/2008:** These years do not correspond to any major legislative overhaul of the Epidemic Diseases Act. 1995 is often associated with the launch of the Revised National Tuberculosis Control Program (RNTCP), and 2000 with the National Population Policy. **High-Yield Clinical Pearls for NEET-PG:** * **The Original Act:** The Epidemic Diseases Act was originally enacted in **1897** to prevent the spread of dangerous epidemic diseases. * **Recent Amendment:** The Act was significantly amended in **2020** (via an Ordinance) to provide protection to healthcare service personnel against violence during pandemics (COVID-19). * **Key Section:** Section 3 of the Act prescribes penalties for disobeying regulations, often linked with Section 188 of the Indian Penal Code (IPC). * **IDSP (2004):** Just after the 2003 focus, the Integrated Disease Surveillance Programme was launched in 2004 to strengthen decentralized laboratory-based IT-enabled disease surveillance.

Question 455: Which strain is used for the BCG vaccine?

A. Jeryl Lynn
B. Danish 1331 (Correct Answer)
C. 17D
D. Moraten

Explanation: **Explanation:** **Correct Answer: B. Danish 1331** The BCG (Bacillus Calmette-Guérin) vaccine is a live attenuated vaccine derived from *Mycobacterium bovis*. While several strains exist globally (such as Tokyo 172, Pasteur 1173, and Glaxo 1077), the **Danish 1331** strain is the specific sub-strain used for vaccine production in India. It is preferred due to its consistent immunogenicity and safety profile. **Analysis of Incorrect Options:** * **A. Jeryl Lynn:** This is the live attenuated strain used for the **Mumps** vaccine. * **C. 17D:** This is the specific strain used for the **Yellow Fever** vaccine. * **D. Moraten:** This is a highly attenuated strain used for the **Measles** vaccine (more common in the Edmonston-Zagreb strain in India). **High-Yield Clinical Pearls for NEET-PG:** * **Type of Vaccine:** Live attenuated (derived from *M. bovis*). * **Dose:** 0.1 mL (0.05 mL for neonates below 4 weeks of age). * **Route:** Strictly **Intradermal** using an Omega/Tuberculin syringe. * **Site:** Left upper arm (deltoid region) – standardized to avoid confusion with other vaccines. * **Diluent:** Normal Saline (0.9% NaCl). Distilled water is avoided as it causes irritation. * **Evolution of Lesion:** Papule (2-3 weeks) → Glazed ulcer (5-6 weeks) → Permanent **pitted scar** (6-12 weeks). * **Protective Effect:** Highly effective against severe forms of childhood TB (Miliary TB and TB Meningitis), but has variable efficacy against adult pulmonary TB.

Question 456: One person infected with tuberculosis can infect how many other people in one year?

A. 20
B. 30
C. 10 (Correct Answer)
D. 5

Explanation: **Explanation:** The correct answer is **10**. According to standard epidemiological data provided by the WHO and Park’s Textbook of Preventive and Social Medicine, an untreated person with active pulmonary tuberculosis (sputum smear-positive) can infect, on average, **10 to 15 people** in a single year. **Why Option C is Correct:** The transmission of *Mycobacterium tuberculosis* occurs via droplet nuclei. In an average community setting, a single infectious source typically leads to 10–15 new infections annually. While the range is 10–15, "10" is the most frequently cited lower-bound figure in competitive exams like NEET-PG. **Why Other Options are Incorrect:** * **Options A (20) and B (30):** These numbers are overestimations. While a "superspreader" in a crowded, poorly ventilated environment might infect more people, the population average remains significantly lower. * **Option D (5):** This is an underestimation. Given the chronic nature of the disease and the high density of living conditions in endemic areas, a smear-positive patient typically infects more than five individuals before diagnosis or natural resolution. **High-Yield Clinical Pearls for NEET-PG:** * **Infectious Dose:** TB has a very low infectious dose; inhalation of just **1 to 10 bacilli** can initiate an infection. * **Secondary Attack Rate (SAR):** For TB, the SAR among household contacts is approximately **20–50%**. * **The "Rule of Halves" in TB:** Roughly 50% of the population is infected (latent), 50% of those are diagnosed, 50% of those are treated, and 50% of those are cured (this is a conceptual tool to highlight gaps in care). * **Risk of Progression:** An individual infected with TB has a **10% lifetime risk** of developing active clinical disease (highest in the first 2 years).

Question 457: Oral Rehydration Solution (ORS) contains 75 mmol/litre of which of the following electrolytes or solute?

A. Sodium (Correct Answer)
B. Potassium
C. Glucose
D. Chloride

Explanation: The correct answer is **Sodium**. This question refers to the **WHO Reduced Osmolarity ORS**, which has been the standard recommendation since 2002 to reduce the need for unscheduled IV fluids and decrease stool output. ### Why Sodium is Correct In the current WHO ORS formulation, the concentration of **Sodium is exactly 75 mmol/L**. This concentration is optimized to facilitate the co-transport of sodium and glucose across the intestinal epithelium via the SGLT-1 transporter. This mechanism remains intact even during secretory diarrheas like Cholera, allowing for effective rehydration. ### Why Other Options are Incorrect * **Glucose (75 mmol/L):** While Glucose also has a concentration of 75 mmol/L in the current formula, Sodium is the primary electrolyte being asked about in the context of "electrolytes or solutes" where Sodium is the physiological priority for volume expansion. (Note: In many exams, if both are 75, Sodium is the classic answer for osmolarity discussions). * **Chloride (65 mmol/L):** The chloride content was reduced in the new formulation to 65 mmol/L to maintain electrochemical balance while lowering total osmolarity. * **Potassium (20 mmol/L):** Potassium remains at 20 mmol/L to replace losses and prevent hypokalemia, but it does not match the 75 mmol/L threshold. ### High-Yield Clinical Pearls for NEET-PG * **Total Osmolarity:** The total osmolarity of Reduced Osmolarity ORS is **245 mOsm/L** (Old ORS was 311 mOsm/L). * **Citrate:** Trisodium citrate (10 mmol/L) is used instead of bicarbonate because it increases the shelf life of ORS packets. * **Zinc Supplementation:** Always remember that for children with diarrhea, Zinc (20 mg/day for 14 days; 10 mg for infants <6 months) is given alongside ORS to reduce the duration and severity of the episode. * **Composition Summary (mmol/L):** Na+ (75), Cl- (65), Glucose (75), K+ (20), Citrate (10).

Question 458: All of the following are true about Roll Back Malaria except?

A. Insecticide-treated bed nets
B. Strengthening the health system
C. Developing new insecticides (Correct Answer)
D. Training health workers

Explanation: **Explanation:** The **Roll Back Malaria (RBM)** partnership was launched in 1998 by WHO, UNICEF, UNDP, and the World Bank. Its primary goal is to reduce the malaria burden through the implementation of evidence-based strategies and strengthening health systems, rather than focusing on basic laboratory research like developing new chemicals. **Why Option C is the Correct Answer:** Developing new insecticides is a function of **Research and Development (R&D)** and chemical industries, not a core operational strategy of the Roll Back Malaria initiative. RBM focuses on the **scaling up** of existing, proven interventions and ensuring they reach the populations in need. **Analysis of Incorrect Options:** * **Option A (Insecticide-treated bed nets):** This is one of the four main technical strategies of RBM. Long-Lasting Insecticidal Nets (LLINs) are the gold standard for vector control. * **Option B & D (Strengthening health systems & Training health workers):** RBM emphasizes sustainable development. This includes improving healthcare infrastructure, ensuring a steady supply of Artemisinin-based Combination Therapy (ACT), and training community health workers for early diagnosis and prompt treatment (EDPT). **NEET-PG High-Yield Pearls:** * **RBM Strategies:** 1. Evidence-based interventions (LLINs, IRS, ACTs); 2. Strengthening health systems; 3. Multi-sectoral partnership; 4. Movement for social mobilization. * **Global Target:** The current "Global Technical Strategy for Malaria 2016–2030" aims for a **90% reduction** in malaria incidence and mortality rates by 2030. * **World Malaria Day:** Observed on **April 25th**. * **Drug of Choice:** ACT is the mainstay for *P. falciparum*, while Primaquine is added for *P. vivax* to prevent relapse (except in G6PD deficiency).

Question 459: What is the minimum distance from an airport or seaport that must be free from mosquitoes?

A. 400 m (Correct Answer)
B. 500 m
C. 1 km
D. 100 m

Explanation: **Explanation:** The correct answer is **400 meters (A)**. This regulation is governed by the **International Health Regulations (IHR)** and the **National Vector Borne Disease Control Programme (NVBDCP)**. **1. Why 400 meters is correct:** The primary objective of maintaining a "mosquito-free zone" around international points of entry (airports and seaports) is to prevent the **"Airport Malaria"** or **"Stowaway Mosquito"** phenomenon. This refers to the accidental transport of infected vectors (like *Anopheles* or *Aedes*) via aircraft or ships to non-endemic regions. A perimeter of 400 meters is established because it exceeds the typical flight range of most vector mosquitoes from their breeding sites to the craft, thereby minimizing the risk of vectors boarding the vessel or infecting passengers in transit. **2. Analysis of Incorrect Options:** * **B (500 m):** While 500 meters is a common buffer zone in urban planning, it is not the specific statutory requirement for international vector control. * **C (1 km):** This distance is unnecessarily large for routine vector control at ports and would be logistically difficult to maintain in dense urban areas. * **D (100 m):** This is insufficient, as many mosquitoes can easily fly this distance to reach a host or a resting site within a terminal or vessel. **3. High-Yield Clinical Pearls for NEET-PG:** * **Yellow Fever:** The 400m rule is most strictly enforced to prevent the spread of Yellow Fever. * **Aedes aegypti Index:** For an airport/seaport to be considered "safe," the *Aedes aegypti* index (percentage of houses positive for larvae) must be kept **below 1%**. * **Disinsecting:** The process of killing mosquitoes inside an aircraft is called "disinsecting," usually done using aerosolized d-phenothrin. * **Vector Control:** This falls under the "International Health Regulations (2005)," which are legally binding on WHO member states to prevent the international spread of diseases.

Question 460: Active immunization following exposure is most commonly given for which of the following?

A. Rabies (Correct Answer)
B. Polio
C. Plague
D. Measles

Explanation: **Explanation:** The correct answer is **Rabies**. This question tests the concept of **Post-Exposure Prophylaxis (PEP)** through active immunization. **Why Rabies is Correct:** Rabies has a uniquely long and variable incubation period (typically 1–3 months). This "window period" allows the body enough time to mount a protective immune response via **active immunization** (vaccine) before the virus reaches the Central Nervous System. In clinical practice, Rabies PEP is the most common scenario where active immunization (often combined with passive immunization/immunoglobulins) is administered *after* exposure to prevent disease onset. **Analysis of Incorrect Options:** * **Polio:** Immunization is strictly **pre-exposure** (preventative). Once exposure occurs, the virus replicates too rapidly in the gut and lymphoid tissue for post-exposure vaccination to be effective. * **Plague:** Management after exposure involves **chemoprophylaxis** (e.g., Doxycycline or Sulfonamides), not active immunization. * **Measles:** While active immunization can be given within 72 hours of exposure to provide some protection, it is not the "most common" or definitive indication compared to Rabies, where post-exposure vaccination is the standard of care globally. **High-Yield Clinical Pearls for NEET-PG:** * **Diseases where PEP includes Active Immunization:** Rabies, Hepatitis B, Tetanus, and Measles. * **Rabies Vaccine Schedule (Post-exposure):** 0, 3, 7, 14, and 28 days (Intramuscular/Essen regimen) OR 2-2-2-0-2 (Intradermal/Thai Red Cross regimen). * **Rule of Thumb:** If the incubation period of a disease is longer than the time required for the vaccine to produce antibodies (usually 7–10 days), post-exposure active immunization is theoretically possible.

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