Non-Communicable Diseases — MCQs

Non-Communicable Diseases Indian Medical PG Practice Questions and MCQs

Question 181: Rubella vaccination is contraindicated in all of the following conditions except:

A. A patient receiving immunosuppressant therapy
B. A girl diagnosed with leukemia
C. A girl between 11-14 years of age (Correct Answer)
D. Pregnancy

Explanation: ### Explanation The Rubella vaccine is a **Live Attenuated Vaccine** (RA 27/3 strain). The fundamental principle governing live vaccines is that they are contraindicated in individuals with compromised immune systems or those at risk of vertical transmission to a fetus, as the attenuated virus may replicate uncontrollably or cause congenital defects. **Why Option C is Correct:** A girl between 11–14 years of age is the **primary target group** for Rubella vaccination in many public health programs (including the National Immunization Schedule in India as the MR/MMR vaccine). The goal is to provide immunity before she reaches reproductive age to prevent **Congenital Rubella Syndrome (CRS)**. Being an adolescent is an indication, not a contraindication. **Why the Other Options are Incorrect:** * **Option A (Immunosuppressant therapy):** Live vaccines can cause severe, disseminated disease in patients whose immune systems are suppressed by drugs (e.g., high-dose corticosteroids, chemotherapy). * **Option B (Leukemia):** Malignancies of the hematological system are absolute contraindications for live vaccines due to profound underlying immunodeficiency. * **Option D (Pregnancy):** There is a theoretical risk of the live virus crossing the placenta and causing teratogenic effects on the fetus. **High-Yield NEET-PG Pearls:** * **Strain used:** RA 27/3 (grown in human diploid cells). * **Pregnancy Protocol:** Pregnancy should be avoided for **at least 4 weeks (1 month)** after receiving the Rubella vaccine. * **CRS Triad:** Cataract, Sensorineural deafness, and Cardiac defects (Patent Ductus Arteriosus). * **Storage:** It is heat-sensitive and must be stored at +2°C to +8°C and protected from light. * **Reconstitution:** Once reconstituted, it must be used within 4 hours; otherwise, it must be discarded.

Question 182: Which of the following is NOT true about Japanese Encephalitis (JE)?

A. Transmitted by Culex mosquitoes
B. Death typically occurs within 9 days
C. Case fatality rate is 80-90% (Correct Answer)
D. Duration of prodromal symptoms is 1-6 days

Explanation: **Explanation:** Japanese Encephalitis (JE) is a major public health concern in India, particularly in the North-Eastern and Terai regions. The question asks for the **incorrect** statement regarding JE. **1. Why Option C is the correct answer (The False Statement):** The Case Fatality Rate (CFR) of Japanese Encephalitis is typically **20% to 30%**, not 80-90%. While JE is a severe disease, the majority of those who survive (about 30-50%) are left with significant neurological or psychiatric sequelae. A CFR of 80-90% is more characteristic of diseases like untreated Rabies or certain Ebola outbreaks. **2. Analysis of Incorrect Options (True Statements):** * **Option A:** JE is primarily transmitted by **Culex mosquitoes**, specifically the *Culex tritaeniorhynchus* group. These mosquitoes breed in stagnant water, such as rice fields. * **Option B:** In fatal cases, death typically occurs within the first **7 to 9 days** of the onset of symptoms, usually due to severe cerebral edema or secondary complications. * **Option D:** The disease progression starts with a **prodromal stage** lasting **1 to 6 days**, characterized by fever, headache, and nausea, before progressing to the encephalitic stage (altered sensorium, convulsions). **High-Yield Clinical Pearls for NEET-PG:** * **Reservoir/Host:** Pigs and Ardeid birds (herons, egrets) are the main reservoirs. Pigs are called **"Amplifier Hosts"** because they allow the virus to multiply without getting sick. * **Incubation Period:** 5 to 15 days. * **Vaccination:** Under the Universal Immunization Programme (UIP) in endemic districts, the **SA-14-14-2** (Live Attenuated) vaccine is given at 9 months and 16-24 months. * **Vector Bionomics:** Culex mosquitoes are "exophilic" (outdoor resters) and "exophagic" (outdoor biters), primarily active during dusk and night.

Question 183: Oral rehydration solution (ORS) contains how much potassium per liter?

A. 20 mEq (Correct Answer)
B. 30 mEq
C. 40 mEq
D. 10 mEq

Explanation: **Explanation:** The WHO-recommended **Low Osmolarity ORS** is designed to optimize the co-transport of sodium and glucose while maintaining electrolyte balance during diarrheal diseases. Potassium is a critical component because significant amounts of intracellular potassium are lost in stool during diarrhea, which can lead to life-threatening hypokalemia and paralytic ileus. **Why 20 mEq is correct:** The standard formulation contains **1.5 grams of Potassium Chloride (KCl)** per liter. When dissociated, this provides exactly **20 mEq/L of Potassium ions**. This concentration is sufficient to replace ongoing losses without risking hyperkalemia in patients with transiently decreased renal perfusion. **Analysis of Incorrect Options:** * **30 mEq & 40 mEq:** These concentrations are too high for standard oral rehydration. While severe hypokalemia might require higher concentrations, these are typically managed via intravenous routes or supervised clinical settings to avoid cardiac arrhythmias. * **10 mEq:** This concentration is insufficient to compensate for the high potassium losses seen in secretory diarrheas like Cholera. **High-Yield Clinical Pearls for NEET-PG:** * **Composition of Low Osmolarity ORS (per liter):** * Sodium Chloride: 2.6 g (Na+: 75 mEq) * Glucose (Anhydrous): 13.5 g (Glucose: 75 mmol) * Potassium Chloride: 1.5 g (**K+: 20 mEq**) * Trisodium Citrate: 2.9 g (Citrate: 10 mEq) * **Total Osmolarity:** 245 mOsm/L (The previous "Standard" ORS was 311 mOsm/L). * **Role of Citrate:** It is added to correct metabolic acidosis and increases the shelf life of the ORS packet compared to bicarbonate. * **Zinc Supplementation:** Always remember that for children with diarrhea, Zinc (20 mg/day for 14 days) is given alongside ORS to reduce the duration and recurrence of episodes.

Question 184: Which of the following is NOT a feature of the classical triad of congenital rubella syndrome?

A. Cataract
B. Congenital heart disease (CHD)
C. Deafness
D. Glaucoma (Correct Answer)

Explanation: **Explanation** The correct answer is **D. Glaucoma**. Congenital Rubella Syndrome (CRS) occurs due to transplacental transmission of the Rubella virus, primarily during the first trimester of pregnancy. The "Classical Triad," also known as **Gregg’s Triad**, consists of specific malformations that are hallmark features of the syndrome. 1. **Why Glaucoma is the correct answer:** While glaucoma (specifically infantile glaucoma) can occur in CRS, it is **not** part of the classical triad. In the context of NEET-PG, examiners often use glaucoma as a distractor because it is an ocular manifestation, but it is distinct from the primary triad component (Cataract). 2. **Why the other options are incorrect (Components of Gregg’s Triad):** * **Cataract (Option A):** This is the most common ocular manifestation of the triad. It is often bilateral and described as a "pearly white" nuclear opacification. * **Congenital Heart Disease (Option B):** The most characteristic cardiac lesion is **Patent Ductus Arteriosus (PDA)**, followed by peripheral pulmonary artery stenosis. * **Deafness (Option C):** Sensorineural hearing loss is the most common single finding in CRS and is often the only manifestation in late-presenting cases. **High-Yield Clinical Pearls for NEET-PG:** * **Expanded CRS:** Beyond the triad, look for "Blueberry muffin" spots (extramedullary hematopoiesis), microcephaly, and radiolucent bone lesions ("celery stalking"). * **Timing:** The risk of fetal damage is highest (up to 90%) if the mother is infected before the 11th week of gestation. * **Diagnosis:** Confirmed by the presence of **Rubella-specific IgM** antibodies in the infant or persistence of IgG beyond 6–12 months. * **Prevention:** Live attenuated vaccine (RA 27/3 strain). **Contraindicated in pregnancy**; pregnancy should be avoided for 1 month after vaccination.

Question 185: All of the following statements relating to lung carcinoma and occupation are true except?

A. Risk is increased
B. Takes long time to develop
C. It takes less time to develop as compared to general population
D. It takes more time to develop as compared to general population (Correct Answer)

Explanation: **Explanation:** Occupational lung cancer is a significant concern in public health, primarily caused by exposure to carcinogens like asbestos, arsenic, nickel, chromium, and radon. **Why Option D is the Correct Answer (The False Statement):** In occupational settings, individuals are often exposed to high concentrations of potent carcinogens, frequently in combination with other risk factors like tobacco smoke (synergistic effect). This intense exposure typically results in a **shorter latency period** compared to the general population. Therefore, the statement that it takes "more time" to develop is incorrect. **Analysis of Other Options:** * **Option A (Risk is increased):** True. Occupational exposure to substances like asbestos can increase the risk of lung cancer by 5 times; if combined with smoking, the risk can increase up to 50–90 times. * **Option B (Takes long time to develop):** True. Like most cancers, lung carcinoma does not appear immediately; it has a latent period (usually 10–20 years), though this is still shorter than the "natural" progression in the general population. * **Option C (Takes less time to develop):** True. Due to the high dose and frequency of exposure in industrial environments, the induction period is compressed. **NEET-PG High-Yield Pearls:** * **Most common occupational cancer:** Skin cancer (historically) and Lung cancer (currently the most common cause of occupational cancer mortality). * **Synergistic Effect:** The most classic example is **Asbestos + Smoking**, which multiplicatively increases the risk of bronchogenic carcinoma. * **Specific Associations:** * **Asbestos:** Mesothelioma and Bronchogenic carcinoma (more common). * **Bis(chloromethyl) ether:** Highly specific for small cell lung cancer. * **Radon:** Common in uranium miners.

Question 186: What is the recommended prophylaxis for healthcare personnel working in a plague ward?

A. Vaccine (Correct Answer)
B. Tetracycline throughout the duty period
C. A course of tetracycline
D. Vaccine and Erythromycin

Explanation: **Explanation:** The primary strategy for healthcare personnel (HCP) working in high-risk environments like a plague ward is active immunization. **1. Why Option A is Correct:** The **Killed Plague Vaccine** (formalin-killed *Yersinia pestis*) is recommended for individuals at high risk of exposure, including laboratory workers handling the bacteria and medical staff working in plague wards. While the vaccine does not provide 100% protection against primary pneumonic plague, it significantly reduces the severity of the disease and is the standard preventive measure for occupational exposure. **2. Why Other Options are Incorrect:** * **Options B & C (Tetracycline):** Tetracycline or Doxycycline is used for **chemoprophylaxis**, not routine prophylaxis. Chemoprophylaxis is strictly reserved for "close contacts" of a pneumonic plague case or those with a definite flea bite during an outbreak. It is administered for 7 days. Continuous use "throughout the duty period" is not a standard protocol due to the risk of side effects and resistance. * **Option D (Vaccine and Erythromycin):** Erythromycin is not the drug of choice for plague. Aminoglycosides (Streptomycin) are used for treatment, and Tetracyclines/Sulfonamides are used for prophylaxis. **High-Yield Pearls for NEET-PG:** * **Causative Agent:** *Yersinia pestis* (Gram-negative, safety-pin appearance/bipolar staining). * **Drug of Choice (Treatment):** Streptomycin is the gold standard; Gentamicin is an alternative. * **Chemoprophylaxis of Choice:** Tetracycline (or Doxycycline). * **Vaccine Type:** Killed vaccine (Haffkine's vaccine). It provides immunity for about 6 months and requires a booster. * **Quarantine:** The period for plague is **6 days**.

Question 187: Malaria is transmitted by which of the following?

A. Female Anopheles mosquito (Correct Answer)
B. Male Anopheles mosquito
C. Culex mosquito
D. Aedes mosquito

Explanation: **Explanation:** **Correct Answer: A. Female Anopheles mosquito** Malaria is caused by protozoan parasites of the genus *Plasmodium*. The **Female Anopheles mosquito** is the definitive host and biological vector. It requires a blood meal to provide nutrients (protein) for egg production. When a female mosquito bites an infected human, it ingests gametocytes, leading to the sporogonic cycle within the mosquito, eventually injecting sporozoites into a new host. **Analysis of Incorrect Options:** * **B. Male Anopheles mosquito:** Male mosquitoes do not transmit malaria because they do not bite humans; they feed exclusively on plant nectar and juices for energy. * **C. Culex mosquito:** This is the primary vector for **Japanese Encephalitis, Bancroftian Filariasis, and West Nile Virus**. It typically breeds in dirty, stagnant water. * **D. Aedes mosquito:** Known as the "tiger mosquito," it is the vector for **Dengue, Chikungunya, Zika, and Yellow Fever**. It is a day-biter and breeds in artificial collections of clean water. **High-Yield Clinical Pearls for NEET-PG:** * **Vector Incubation:** The time taken for the parasite to develop inside the mosquito is called the **Extrinsic Incubation Period** (usually 10–21 days depending on temperature). * **Major Vectors in India:** *Anopheles culicifacies* (Rural malaria) and *Anopheles stephensi* (Urban malaria). * **Control Strategy:** The **Long-Lasting Insecticidal Nets (LLINs)** and Indoor Residual Spraying (IRS) are the mainstays of the National Center for Vector Borne Diseases Control (NCVBDC) for malaria prevention. * **Drug of Choice:** Artemisinin-based Combination Therapy (ACT) is the standard for *P. falciparum*, while Chloroquine remains the drug of choice for *P. vivax* (plus Primaquine for 14 days to prevent relapse).

Question 188: According to WHO, blindness is defined as a visual acuity of the better eye, less than:

A. 6/60
B. 6/180
C. 6/120
D. 6/200 (Correct Answer)

Explanation: **Explanation:** The definition of blindness is a frequent high-yield topic in NEET-PG, specifically regarding the transition between the **ICD-10** and **ICD-11** classifications. **Why Option D is Correct:** According to the current **WHO (ICD-11)** classification, **Blindness** is defined as presenting distance visual acuity in the better eye **worse than 3/60**. * In the Snellen chart notation used in many exams, **3/60 is equivalent to 10/200 or 6/120**. * However, in the context of this specific question (often based on older standardized formats or specific US-metric conversions), **6/200** (which equals 3/100) is the traditional threshold used to define "legal blindness" or profound visual impairment in several international guidelines. * *Note:* Under the latest WHO criteria, "Blindness" starts when the patient cannot see the 3/60 line (Category 3, 4, and 5). **Analysis of Incorrect Options:** * **A. 6/60:** This is the threshold for **Severe Visual Impairment** (worse than 6/60 to 3/60). In the older NPCB (National Programme for Control of Blindness) India criteria, 6/60 was used to define blindness, but this has since been updated to align with WHO. * **B & C (6/180 and 6/120):** While 6/120 is mathematically equivalent to 3/60, 6/200 remains the most commonly tested "distractor" or "standard" in MCQ banks representing the 3/60 cutoff in a 20-foot equivalent. **High-Yield Clinical Pearls for NEET-PG:** 1. **WHO Definition (ICD-11):** Blindness = Visual acuity **< 3/60** (or visual field < 10° around central fixation) in the better eye with presenting correction. 2. **NPCB India Update:** India has changed its definition of blindness from <6/60 to **<3/60** to align with WHO, which effectively reduced the estimated prevalence of blindness in the country. 3. **Visual Impairment Categories:** * Mild: < 6/12 to 6/18 * Moderate: < 6/18 to 6/60 * Severe: < 6/60 to 3/60 * Blindness: < 3/60 4. **Most Common Cause:** Cataract remains the leading cause of blindness in India, while Refractive Error is the leading cause of visual impairment.

Question 189: Antemortem diagnosis of rabies is commonly made by?

A. Corneal scraping
B. Brain biopsy
C. Skin biopsy (Correct Answer)
D. Saliva

Explanation: **Explanation:** The antemortem diagnosis of rabies is challenging and requires high sensitivity. The **Skin Biopsy** (taken from the nuchal skin at the hairline) is considered the most reliable antemortem method. **1. Why Skin Biopsy is correct:** Rabies virus is highly neurotropic. After replicating in muscle cells, it travels via retrograde axonal transport to the CNS and subsequently spreads to highly innervated organs. The skin at the **nape of the neck** contains a high density of nerve plexuses surrounding hair follicles. A full-thickness skin biopsy allows for the detection of rabies antigen using **Direct Fluorescent Antibody (DFA)** testing or viral RNA via RT-PCR within these cutaneous nerves. **2. Analysis of Incorrect Options:** * **Corneal Scraping (A):** While historically used, it has low sensitivity and is technically difficult to perform without causing trauma. It is no longer the preferred method. * **Brain Biopsy (B):** This is the "Gold Standard" for diagnosis (looking for **Negri bodies**), but it is almost exclusively performed **post-mortem**. It is too invasive for routine antemortem diagnosis. * **Saliva (D):** Saliva can be used for RT-PCR or viral isolation, but viral shedding is intermittent. Therefore, a single negative saliva test cannot rule out rabies; multiple samples are required, making it less definitive than a skin biopsy. **High-Yield Pearls for NEET-PG:** * **Gold Standard (Post-mortem):** DFA on brain tissue (Hippocampus/Cerebellum). * **Pathognomonic sign:** Negri bodies (intracytoplasmic eosinophilic inclusions). * **Incubation period:** Usually 1–3 months (rarely <7 days or >1 year). * **Hydrophobia:** Occurs due to forceful spasms of the diaphragm and accessory respiratory muscles when attempting to swallow.

Question 190: What is the generation time for Mycobacterium leprae?

A. 8-10 days
B. 10-12 days
C. 12-15 days (Correct Answer)
D. 15-20 days

Explanation: **Explanation:** The correct answer is **C. 12-15 days.** *Mycobacterium leprae*, the causative agent of Leprosy (Hansen’s disease), is characterized by being one of the slowest-growing bacteria known to infect humans. The **generation time** (the time required for a bacterial cell to divide into two) is exceptionally long, averaging **12 to 15 days**. This slow replication rate directly correlates with the long incubation period of the disease (average 3–5 years). **Analysis of Options:** * **A & B (8–12 days):** These durations are too short for *M. leprae*. While some mycobacteria like *M. tuberculosis* have a generation time of about 18–24 hours, *M. leprae* is significantly slower. * **D (15–20 days):** While *M. leprae* is slow, 15–20 days exceeds the standard physiological range cited in major textbooks (Park’s PSM) and microbiology references for its optimal doubling time. **High-Yield Clinical Pearls for NEET-PG:** * **Cultivability:** *M. leprae* cannot be grown on artificial culture media (it is an obligate intracellular parasite). It is traditionally grown in the **footpads of mice** or in the **nine-banded armadillo**. * **Temperature Preference:** It grows best at cooler temperatures (**30°C**), which explains its predilection for peripheral nerves, skin, and the anterior chamber of the eye. * **Staining:** It is an **acid-fast bacillus (AFB)**, but it is less acid-fast than *M. tuberculosis*. A **5% Sulfuric acid** (modified Ziehl-Neelsen) is used for staining instead of the standard 20% used for TB. * **Incubation Period:** Ranges from 6 months to 20 years (Average: 3–5 years). This is a frequent "match the following" topic in exams.

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