Non-Communicable Diseases Practice Questions

Q: Normal saline is used as a diluent in which vaccine?

BCG. **Explanation:** The correct answer is **BCG (Bacillus Calmette–Guérin)**. Vaccines are often supplied in a freeze-dried (lyophilized) form to maintain stability and require a specific diluent for reconstitution. For the BCG vaccine, **Normal Saline (0.9% NaCl)** is the recommended diluent. It is used because it is isotonic and maintains the viability of the live-attenuated *Mycobacterium bovis* bacilli. Using distilled water instead of saline can cause irritation and local inflammation due to tonicity differences. **Analysis of Options:** * **Measles and Rubella (MR):** These vaccines typically use **Sterile Water for Injection** as the diluent. Using saline for measles can potentially damage the live virus, reducing its potency. * **Hepatitis A (HAV):** This is generally available as a liquid, inactivated vaccine (e.g., Havrix) or a pre-filled syringe; it does not require reconstitution with a diluent. **High-Yield Clinical Pearls for NEET-PG:** * **BCG Reconstitution:** Once reconstituted, the vaccine must be used within **3 to 4 hours** (or by the end of the session). Any leftover vaccine must be discarded to prevent contamination (e.g., *Staphylococcal* Toxic Shock Syndrome). * **Storage:** Both the vaccine and the diluent should ideally be stored at **+2°C to +8°C** to prevent thermal shock during mixing. * **JE Vaccine:** The Japanese Encephalitis (live attenuated SA 14-14-2) vaccine uses **Phosphate Buffered Saline** as a diluent. * **Site of BCG:** It is administered strictly **intradermally** on the left upper arm to maintain uniformity in scar assessment.

Q: Which of the following is NOT included in the 'Roll Back Malaria' initiative?

Training of health workers. The **Roll Back Malaria (RBM)** initiative was launched in 1998 by WHO, UNICEF, UNDP, and the World Bank with the goal of halving the global malaria burden. It focuses on evidence-based technical strategies rather than general administrative training. ### **Explanation of the Correct Option** **D. Training of health workers:** While human resource development is essential for any health program, it is considered a **general supportive activity** rather than a core technical pillar of the RBM initiative. RBM focuses on specific interventions like vector control, prompt treatment, and infrastructure strengthening. In the context of NEET-PG, "Training" is often a distractor when compared to specific technical interventions like ITNs or drug development. ### **Analysis of Incorrect Options** * **A. Insecticide-treated nets (ITNs):** This is a primary technical strategy of RBM for vector control and personal protection. * **B. Strengthening the health system:** RBM emphasizes that malaria control cannot succeed in isolation; it requires a robust health delivery system to ensure the reach of commodities (like ACTs and RDTs). * **C. Development of new insecticides:** RBM actively promotes Research and Development (R&D) to combat the emerging threat of insecticide resistance. ### **High-Yield Clinical Pearls for NEET-PG** * **The Four Pillars of RBM:** 1. Early diagnosis and prompt treatment (using ACTs). 2. Multiple preventive measures (ITNs, Indoor Residual Spraying). 3. Strengthening health systems. 4. Research and development for new tools (vaccines, drugs, insecticides). * **Global Technical Strategy (GTS) 2016–2030:** The current framework aiming for a 90% reduction in malaria mortality and incidence by 2030. * **Drug of Choice:** Artemisinin-based Combination Therapy (ACT) is the cornerstone of RBM’s treatment strategy for *P. falciparum*.

Q: What is the chemoprophylaxis dose of chloroquine per week?

300 mg once daily per week. **Explanation** The chemoprophylaxis of Malaria is a high-yield topic for NEET-PG. According to the National Vector Borne Disease Control Programme (NVBDCP) guidelines, the standard chemoprophylaxis for travelers or individuals at risk in chloroquine-sensitive areas is **Chloroquine**. **Why the correct answer is right:** The standard dose of Chloroquine for prophylaxis is **300 mg (base)** taken **once weekly**. It is important to distinguish between the "base" and the "salt." 500 mg of Chloroquine phosphate salt is equivalent to 300 mg of Chloroquine base. The regimen should start 1 week before entering the endemic area and continue for 4 weeks after leaving. (Note: Option D is phrased as "300 mg once daily per week," which in medical entrance exams refers to the weekly cumulative dose administered as a single weekly bolus). **Analysis of Incorrect Options:** * **A (300 mg twice a week):** This exceeds the recommended prophylactic dose and increases the risk of toxicity (retinopathy/GI distress) without added benefit. * **B & C (600 mg once a week):** 600 mg (base) is the **loading dose** used in the clinical treatment of malaria (Day 1), not for long-term prophylaxis. **High-Yield Clinical Pearls for NEET-PG:** * **Mefloquine:** Used for prophylaxis in chloroquine-resistant areas. Dose: 250 mg once weekly. Contraindicated in patients with a history of seizures or psychiatric disorders. * **Doxycycline:** Used for short-term prophylaxis in areas with multi-drug resistance. Dose: 100 mg **daily**. * **Pregnancy:** Chloroquine is safe and is the drug of choice for malaria prophylaxis in pregnant women visiting sensitive areas. * **Duration:** For long-term travelers, Chloroquine prophylaxis is generally not recommended beyond 3 years due to the risk of cumulative retinal toxicity.

Q: BCG vaccine is contraindicated in patients with which of the following conditions?

All of the above. **Explanation:** The BCG (Bacillus Calmette-Guérin) vaccine is a **live attenuated vaccine** derived from *Mycobacterium bovis*. Because it contains live organisms, its administration is strictly contraindicated in individuals with compromised skin integrity or impaired immune systems to prevent systemic dissemination of the bacillus (BCG-osis). **Why "All of the Above" is Correct:** 1. **Generalised Eczema & Infective Dermatosis (Options A & B):** BCG is administered intradermally. In conditions where the skin barrier is extensively breached (like generalized eczema, dermatitis, or skin infections), there is a high risk of secondary infection and "BCG-osis" or severe local reactions. Vaccination should be deferred until the skin condition has resolved. 2. **Hypogammaglobulinaemia (Option C):** This represents a primary immunodeficiency. Live vaccines are contraindicated in patients with impaired cell-mediated or humoral immunity (e.g., HIV with low CD4 counts, leukemia, or congenital immunodeficiencies) because the body cannot contain the attenuated pathogen, leading to life-threatening systemic infection. **High-Yield Clinical Pearls for NEET-PG:** * **Method:** Intradermal (using a tuberculin/Omega syringe). * **Site:** Left upper arm (deltoid region) – standardized to avoid confusion with other scars. * **Evolution of Scar:** Papule (2-3 weeks) → Glazed ulcer (5-6 weeks) → Permanent pitted scar (6-12 weeks). * **Reconstitution:** Always use **Normal Saline**. Never use Distilled Water (causes irritation/necrosis). * **Stability:** Must be used within **4-6 hours** of reconstitution; discard thereafter to prevent *Staph. aureus* contamination (Toxic Shock Syndrome). * **Absolute Contraindications:** Pregnancy, symptomatic HIV/AIDS, and generalized skin diseases.

Q: What is the clinical goal for the prevention of coronary heart disease regarding the ratio of cholesterol to HDL?

3.5. **Explanation:** The **Total Cholesterol to HDL (High-Density Lipoprotein) ratio** is a significant predictor of cardiovascular risk. In preventive cardiology and community medicine, this ratio is used to assess the balance between "bad" cholesterol (pro-atherogenic) and "good" cholesterol (anti-atherogenic). **1. Why 3.5 is the Correct Answer:** According to standard clinical guidelines (including Park’s Textbook of Preventive and Social Medicine), the primary goal for the prevention of Coronary Heart Disease (CHD) is to maintain a **Total Cholesterol/HDL ratio below 3.5**. A ratio lower than 3.5 is associated with a significantly lower risk of plaque formation and myocardial infarction. **2. Analysis of Incorrect Options:** * **Option A (1.5) & B (2.5):** While these ratios are excellent and indicate very low cardiovascular risk, they are not the standard "threshold" or clinical goal defined for the general population in public health guidelines. * **Option D (4.5):** A ratio above 4.5 is considered an indicator of **high risk** for CHD. In clinical practice, a ratio of 5.0 or higher suggests a doubling of cardiovascular risk compared to the ideal. **3. High-Yield Clinical Pearls for NEET-PG:** * **HDL (The "Good" Cholesterol):** It facilitates reverse cholesterol transport. A level ** 150 mg/dL** are considered a component of Metabolic Syndrome. * **Rule of Thumb:** For CHD prevention, the goal is to keep the Total Cholesterol/HDL ratio **< 3.5** and the LDL/HDL ratio **< 3.0**.

Q: What is the primary cause of death associated with morbid obesity?

Cardiovascular complications. ### Explanation **1. Why Cardiovascular Complications is Correct:** Morbid obesity (BMI ≥ 40 kg/m² or ≥ 35 kg/m² with comorbidities) is a systemic inflammatory state. It is the leading driver of the **Metabolic Syndrome**, characterized by dyslipidemia, insulin resistance, and hypertension. These factors accelerate **atherosclerosis**, leading to coronary artery disease (CAD), myocardial infarction, and congestive heart failure. Epidemiological data consistently show that cardiovascular disease (CVD) is the primary cause of mortality in obese individuals, accounting for the majority of excess deaths. **2. Analysis of Incorrect Options:** * **Pickwickian Syndrome (Obesity Hypoventilation Syndrome):** While a serious respiratory complication of morbid obesity characterized by hypercapnia and sleep apnea, it is a significant *morbidity* but not the most common cause of *mortality* compared to CVD. * **Hypothyroid Crisis (Myxedema Coma):** This is a life-threatening complication of severe hypothyroidism. While hypothyroidism can cause weight gain, it is a hormonal etiology rather than a primary consequence of morbid obesity itself. * **Cushing Syndrome:** This is a clinical condition resulting from excess cortisol. Like hypothyroidism, it is a *cause* of secondary obesity rather than a fatal *complication* arising from lifestyle-induced morbid obesity. **3. NEET-PG High-Yield Pearls:** * **BMI Classification (WHO):** Overweight (25–29.9), Obese (≥30), Morbidly Obese (≥40). * **Indian/Asian Cut-offs:** Overweight (23–24.9), Obese (≥25). * **Best Indicator of Abdominal Obesity:** Waist-to-hip ratio (Males >0.9, Females >0.85) or simply Waist Circumference. * **Pickwickian Triad:** Obesity, sleep apnea, and daytime hypercapnia (PaCO2 >45 mmHg). * **Cancer Link:** Obesity is also a major risk factor for endometrial, breast (post-menopausal), and colon cancers.

Q: What are the primary hosts involved in the natural transmission cycle of the Japanese encephalitis virus?

Pigs and Mosquitoes. ### Explanation **Japanese Encephalitis (JE)** is a zoonotic viral disease caused by a Group B Arbovirus (Flavivirus). The natural transmission cycle involves a complex interplay between reservoirs, amplifiers, and vectors. **1. Why Option A is Correct:** The transmission cycle of JE is primarily **Enzootic**. * **Pigs** act as the **Amplifier Host**. They develop high-level viremia without showing clinical signs, allowing mosquitoes to pick up the virus easily. * **Mosquitoes** (primarily *Culex tritaeniorhynchus*) act as the **Vector**. They transmit the virus from the amplifier host to humans. * **Ardeid birds** (herons, egrets) act as the **Natural Reservoir/Maintenance Host**. **2. Why Other Options are Incorrect:** * **Option B (Cattle and Birds):** While birds are reservoirs, cattle are "dead-end" hosts. They develop antibodies but do not maintain enough viremia to infect mosquitoes. * **Option C (Pigs and Humans):** Humans are **"Dead-end Hosts."** The level and duration of viremia in humans are insufficient to infect a biting mosquito; therefore, humans do not contribute to the transmission cycle. * **Option D (Birds and Pigs):** While both are involved in the cycle, the question asks for the primary hosts involved in *transmission*. The cycle typically alternates between the vector (mosquito) and the host (pig/bird). **High-Yield Clinical Pearls for NEET-PG:** * **Vector:** *Culex tritaeniorhynchus* (breeds in stagnant water/paddy fields; "Outdoor biters"). * **Amplifier Host:** Pig (The "Link" between nature and man). * **Dead-end Hosts:** Humans and Horses. * **Vaccination:** Live attenuated **SA-14-14-2** is the most commonly used vaccine in the National Immunization Schedule (given at 9 months and 16–24 months). * **Sentinel Surveillance:** Done by monitoring pigs to predict an outbreak.

Question 1

Which of the following best describes the outcome of successful vaccination with a killed vaccine?

Accepted Answer

Long-lasting immunity

Answer

Deploid cell inactivation

Answer

Killed vaccine administration

Answer

Primary immunization requiring two doses

Question 2

Normal saline is used as a diluent in which vaccine?

Accepted Answer

BCG

Answer

Measles

Answer

Rubella

Answer

Hepatitis A virus (HAV)

Question 3

Which of the following is NOT included in the 'Roll Back Malaria' initiative?

Accepted Answer

Training of health workers

Answer

Insecticide-treated nets

Answer

Strengthening the health system

Answer

Development of new insecticides

Question 4

Tracking of blood pressure implies?

Accepted Answer

Blood pressure of a hypertensive individual remains hypertensive

Answer

Blood pressure increases with age

Answer

Blood pressure decreases with age

Answer

Blood pressure of a normotensive individual becomes hypertensive

Question 5

If a new sputum smear positive patient of tuberculosis continues to be smear positive at the end of the intensive phase of category I treatment under DOTS, what should be the further management of this patient?

Accepted Answer

Continue the intensive phase of treatment for one more month

Answer

Start category I treatment again

Answer

Treat as failure and start category II treatment under DOTS

Answer

Start continuation phase under category I

Question 6

What is the chemoprophylaxis dose of chloroquine per week?

Accepted Answer

300 mg once daily per week

Answer

300 mg twice a week

Answer

600 mg once a week

Answer

600 mg once a week

Question 7

BCG vaccine is contraindicated in patients with which of the following conditions?

Accepted Answer

All of the above

Answer

Generalised eczema

Answer

Infective dermatosis

Answer

Hypogammaglobulinaemia

Question 8

What is the clinical goal for the prevention of coronary heart disease regarding the ratio of cholesterol to HDL?

Accepted Answer

3.5

Answer

1.5

Answer

2.5

Answer

4.5

Question 9

What is the primary cause of death associated with morbid obesity?

Accepted Answer

Cardiovascular complications

Answer

Pickwickian syndrome

Answer

Hypothyroid crisis

Answer

Cushing syndrome

Question 10

What are the primary hosts involved in the natural transmission cycle of the Japanese encephalitis virus?

Accepted Answer

Pigs and Mosquitoes

Answer

Cattle and Birds

Answer

Pigs and Humans

Answer

Birds and Pigs

Non-Communicable Diseases — MCQs

Non-Communicable Diseases — MCQs

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