Non-Communicable Diseases — MCQs

Non-Communicable Diseases Indian Medical PG Practice Questions and MCQs

Question 341: Which vaccine is administered as nasal drops?

A. Rubella
B. Poliomyelitis
C. Influenza (Correct Answer)
D. Measles

Explanation: **Explanation:** The correct answer is **Influenza**. Specifically, the **Live Attenuated Influenza Vaccine (LAIV)** is administered via the intranasal route. This vaccine is designed to mimic the natural portal of entry for the virus, inducing local mucosal immunity (IgA) in the nasopharynx as well as systemic immunity. It is commonly used in pediatric populations and is preferred for its non-invasive delivery. **Analysis of Options:** * **Rubella:** This is a live attenuated vaccine (RA 27/3 strain) administered via the **Subcutaneous (SC)** route, usually as part of the MMR or MR combination. * **Poliomyelitis:** There are two types: the Oral Polio Vaccine (OPV/Sabin), which is administered **Orally**, and the Inactivated Polio Vaccine (IPV/Salk), which is administered **Intramuscularly (IM)** or intradermally (fIPV). * **Measles:** This is a live attenuated vaccine (Edmonston-Zagreb strain) administered via the **Subcutaneous (SC)** route. While aerosolized measles vaccines have been researched, they are not the standard of care. **High-Yield Clinical Pearls for NEET-PG:** * **LAIV vs. TIV:** The Live Attenuated Influenza Vaccine is intranasal, whereas the Trivalent Inactivated Vaccine (TIV) is administered intramuscularly. * **Contraindications for LAIV:** Because it is a live vaccine, it is contraindicated in pregnant women, immunocompromised individuals, and children with severe asthma. * **Other Nasal Vaccines:** Apart from Influenza, the **Live Attenuated Japanese Encephalitis (SA-14-14-2)** vaccine has been studied for nasal delivery, but Influenza remains the classic exam answer for this route. * **Storage:** Most live vaccines, including the nasal flu vaccine, require strict cold chain maintenance (2°C to 8°C).

Question 342: Which of the following is true about the rash of chickenpox?

A. Deep seated
B. Centripetal (Correct Answer)
C. Affects palms and soles
D. Slow evolution

Explanation: The rash of **Chickenpox (Varicella)** is a high-yield topic in NEET-PG, characterized by its distinct distribution and rapid progression. ### **Explanation of the Correct Answer** * **Centripetal Distribution:** This is the hallmark of chickenpox. The rash first appears on the trunk (where it is most abundant) and then spreads outwards to the face and limbs. The distal parts of the extremities are relatively spared. This is the opposite of Smallpox, which is centrifugal (affecting the face and extremities more than the trunk). ### **Analysis of Incorrect Options** * **A. Deep seated:** Chickenpox lesions are **superficial** and thin-walled. They are often described as "dewdrops on a rose petal." Deep-seated, firm, and umbilicated lesions are characteristic of Smallpox. * **C. Affects palms and soles:** Chickenpox typically **spares the palms and soles**. If a rash involves the palms and soles, clinicians should consider Syphilis, Hand-Foot-Mouth Disease, or Smallpox. * **D. Slow evolution:** Chickenpox is known for **rapid evolution**. A lesion can progress from a macule to a papule, vesicle, and finally a scab within 24 hours. ### **High-Yield Clinical Pearls for NEET-PG** 1. **Pleomorphism:** This is the most diagnostic feature. Because lesions appear in "crops," all stages of the rash (papules, vesicles, and crusts) can be seen simultaneously in the same area. 2. **Area of Maximum Density:** The rash is most dense in areas protected from irritation and pressure (e.g., axilla). 3. **Incubation Period:** Typically 14–16 days (Range: 10–21 days). 4. **Secondary Attack Rate (SAR):** Very high, approximately 90% in household contacts. 5. **Infectivity:** From 1–2 days *before* the rash appears until all lesions have crusted (usually 6 days after onset).

Question 343: What is the treatment for severe ulnar neuritis in borderline tuberculoid leprosy?

A. Multidrug therapy (MDT) only
B. MDT plus steroids (Correct Answer)
C. Wait and watch
D. MDT plus thalidomide

Explanation: **Explanation:** The correct answer is **MDT plus steroids**. In leprosy, **neuritis** (nerve inflammation) is often a manifestation of a **Type 1 Lepra Reaction** (Reversal Reaction), which is common in Borderline Tuberculoid (BT) leprosy. Severe ulnar neuritis indicates an acute inflammatory process that can lead to irreversible nerve damage and physical disability (e.g., claw hand) if not treated aggressively. 1. **Why MDT plus Steroids is correct:** While MDT (Rifampicin and Dapsone for BT) treats the underlying *Mycobacterium leprae* infection, it does not stop the acute immunological reaction damaging the nerve. **Systemic corticosteroids** (typically Prednisolone) are the gold standard to reduce edema and inflammation within the nerve sheath, thereby preventing permanent paralysis. 2. **Why other options are wrong:** * **MDT only:** Insufficient for neuritis; it kills bacilli but doesn't address the immune-mediated nerve destruction. * **Wait and watch:** Dangerous; delay in treatment leads to permanent nerve fibrosis and disability. * **MDT plus Thalidomide:** Thalidomide is the drug of choice for **Type 2 Lepra Reaction** (Erythema Nodosum Leprosum), which occurs in lepromatous poles, not Type 1 reactions seen in BT leprosy. **High-Yield Clinical Pearls for NEET-PG:** * **Type 1 Reaction:** Delayed hypersensitivity (Cell-mediated); seen in BT, BB, BL; treated with Steroids. * **Type 2 Reaction:** Humoral immunity (Arthus phenomenon); seen in BL, LL; treated with Thalidomide, Clofazimine, or Steroids. * **Silent Neuritis:** Nerve damage without pain/tenderness; also requires urgent steroid therapy. * **WHO MDT Duration (BT):** 6 months (Paucibacillary regimen).

Question 344: Dukoral vaccine is used for which of the following diseases?

A. Typhoid
B. Cholera (Correct Answer)
C. Yellow fever
D. Influenza

Explanation: **Explanation:** **Dukoral** is an oral, killed whole-cell vaccine used for the prevention of **Cholera**. It consists of heat- and formalin-killed *Vibrio cholerae* O1 (both Inaba and Ogawa serotypes) combined with a recombinant non-toxic B-subunit of the cholera toxin (WC/rBS). The B-subunit provides additional cross-protection against Enterotoxigenic *Escherichia coli* (ETEC) by neutralizing the heat-labile toxin (LT). **Analysis of Options:** * **Typhoid (A):** Common vaccines include the injectable Vi polysaccharide (Typhim Vi) and the oral live-attenuated Ty21a (Vivotif). * **Yellow Fever (C):** This is prevented by the **17D strain** vaccine, which is a live-attenuated vaccine administered subcutaneously. * **Influenza (D):** Prevention involves annual shots of inactivated (TIV/QIV) or live-attenuated nasal spray (LAIV) vaccines. **High-Yield Clinical Pearls for NEET-PG:** * **Administration:** Dukoral is administered orally with a buffer (sodium bicarbonate) to protect the B-subunit from gastric acid. * **Dosage:** For adults and children >6 years, 2 doses are given 1–6 weeks apart. For children 2–6 years, 3 doses are required. * **Other Cholera Vaccines:** * **Shanchol & Euvichol:** Bivalent (O1 and O139) killed whole-cell vaccines. Unlike Dukoral, they do **not** contain the B-subunit and do not require a buffer. * **Herd Immunity:** Oral cholera vaccines (OCVs) are known to provide significant herd protection in endemic areas. * **Traveler’s Diarrhea:** Dukoral is often prescribed to travelers for short-term protection against ETEC-induced diarrhea.

Question 345: Which of the following statements about tetanus is FALSE?

A. Tetanospasmin is responsible for the clinical symptoms.
B. Tetanolysin is responsible for the clinical symptoms. (Correct Answer)
C. It is best prevented by active immunization with tetanus toxoid.
D. Tetanus neonatorum is also known as "8th day disease".

Explanation: **Explanation:** The correct answer is **B**, as **Tetanospasmin**, not tetanolysin, is the potent neurotoxin responsible for the clinical manifestations of tetanus. **1. Why Option B is False (The Medical Concept):** *Clostridium tetani* produces two distinct exotoxins: * **Tetanospasmin:** A powerful neurotoxin that blocks the release of inhibitory neurotransmitters (GABA and Glycine) from Renshaw cells in the spinal cord. This leads to unchecked muscular spasms, the hallmark of the disease. * **Tetanolysin:** An oxygen-labile hemolysin that causes local tissue destruction and creates an anaerobic environment favorable for the bacteria, but it has **no known role** in causing the systemic clinical symptoms of tetanus. **2. Analysis of Other Options:** * **Option A:** Correct statement. Tetanospasmin is the primary virulence factor causing trismus (lockjaw), risus sardonicus, and opisthotonus. * **Option C:** Correct statement. Active immunization with Tetanus Toxoid (TT/Td) is the most effective preventive strategy. It induces protective antitoxin levels (>0.01 IU/mL). * **Option D:** Correct statement. Tetanus neonatorum is often called **"8th day disease"** because symptoms typically appear between the 3rd and 14th day after birth (most commonly around the 8th day) due to umbilical cord infection. **Clinical Pearls for NEET-PG:** * **Incubation Period:** Usually 6–10 days. The shorter the incubation period, the worse the prognosis. * **Elimination Goal:** Maternal and Neonatal Tetanus (MNT) elimination is defined as <1 case per 1,000 live births in every district. India achieved this in 2015. * **Autonomic Dysfunction:** A major cause of death in modern intensive care settings. * **Management:** Includes wound debridement, Metronidazole (preferred over Penicillin), and Human Tetanus Immunoglobulin (HTIG).

Question 346: Which disease is transmitted by a sand fly?

A. Trench fever
B. Kala Azar (Correct Answer)
C. Chagas disease
D. Kyasanur Forest Disease (KFD)

Explanation: **Explanation:** **Kala Azar (Visceral Leishmaniasis)** is the correct answer. It is caused by the protozoan parasite *Leishmania donovani* and is transmitted to humans through the bite of an infected female **Phlebotomine sand fly** (*Phlebotomus argentipes* in India). The sand fly thrives in high humidity and alluvial soil, making the disease endemic in states like Bihar and West Bengal. **Analysis of Incorrect Options:** * **Trench Fever:** Caused by *Bartonella quintana*, this disease is transmitted by the **Human Body Louse** (*Pediculus humanus corporis*). * **Chagas Disease (American Trypanosomiasis):** Caused by *Trypanosoma cruzi*, it is transmitted by the **Reduviid bug** (also known as the kissing bug or Triatomine bug). * **Kyasanur Forest Disease (KFD):** A viral hemorrhagic fever found in Karnataka, India, it is transmitted by **Hard Ticks** (*Haemaphysalis spinigera*). **High-Yield NEET-PG Pearls:** * **Vector Control:** The sand fly is highly sensitive to DDT; indoor residual spraying (IRS) is the mainstay of the National Vector Borne Disease Control Programme (NVBDCP). * **Diagnosis:** The **rK39 immunochromatographic test** is the rapid diagnostic test of choice. The gold standard remains the demonstration of **LD bodies** (Amastigotes) in bone marrow or splenic aspirates. * **Treatment:** **Liposomal Amphotericin B** (single dose 10mg/kg) is currently the first-line treatment for Kala Azar in India. * **PKDL:** Post-Kala Azar Dermal Leishmaniasis acts as an important parasite reservoir in the community.

Question 347: What is the standard dose schedule for the Hepatitis B vaccine in adults, in months?

A. 0, 1, 2
B. 0, 1, 3
C. 0, 1, 6 (Correct Answer)
D. 0, 1, 10

Explanation: **Explanation:** The standard vaccination schedule for Hepatitis B in adults follows a **three-dose regimen** at **0, 1, and 6 months**. This schedule is designed to optimize the immune system's primary response and ensure long-term immunological memory. * **The 0-month dose** (First dose) acts as the priming dose. * **The 1-month dose** (Second dose) induces a rapid rise in antibody titers. * **The 6-month dose** (Third dose) acts as a booster, ensuring high peak antibody levels and long-lasting protection (anti-HBs titers ≥10 mIU/mL). **Analysis of Incorrect Options:** * **Option A (0, 1, 2):** This is an **accelerated schedule** used only in specific situations (e.g., rapid travel to endemic areas or post-exposure prophylaxis). It requires a fourth booster dose at 12 months for long-term immunity. * **Option B & D (0, 1, 3 & 0, 1, 10):** These are not standard or WHO-recommended schedules for routine adult immunization. **High-Yield Clinical Pearls for NEET-PG:** * **Route & Site:** Administered **Intramuscularly (IM)**. In adults, the preferred site is the **Deltoid muscle**. It should *never* be given in the gluteal region as the fat layer reduces vaccine efficacy. * **Pediatric Schedule (Universal Immunization Program):** In India, it is given at **0, 6, 10, and 14 weeks** (as part of the Pentavalent vaccine, with a birth dose of Hep B). * **Efficacy:** A person is considered protected if the **Anti-HBs titer is >10 mIU/mL**. * **Dialysis Patients:** They require a higher dose (double the standard dose, 40mcg) and a 4-dose schedule (0, 1, 2, and 6 months).

Question 348: In the 2001 census, which of the following age groups was used as the denominator for calculating the literacy rate?

A. Population 5 years of age and above
B. Population 7 years of age and above (Correct Answer)
C. Population 10 years of age and above
D. People who can read and write irrespective of age

Explanation: ### Explanation **Correct Answer: B. Population 7 years of age and above** In the Indian Census (since 1991), the **Literacy Rate** is defined as the total percentage of the population of an area at a particular time aged **seven years or above** who can read and write with understanding in at least one language. The rationale behind using age 7 as the denominator is that children below this age are usually in the early stages of primary education and may not have attained functional literacy. Including them would artificially deflate the literacy statistics of the country. **Analysis of Incorrect Options:** * **Option A (5 years and above):** This was the criteria used in the Indian Census **prior to 1991**. It was later revised to 7 years to align with international standards and the typical age of completing early primary schooling. * **Option C (10 years and above):** While some international organizations (like UNESCO) may use age 10 or 15 for specific adult literacy indicators, it is not the standard denominator for the Indian Census. * **Option D (Irrespective of age):** This refers to "Crude Literacy Rate." However, the standard "Literacy Rate" (or Effective Literacy Rate) specifically excludes the 0–6 age group to provide a more accurate reflection of educational attainment. **High-Yield Clinical Pearls for NEET-PG:** * **Effective Literacy Rate Formula:** (Number of Literate Persons aged 7+ / Population aged 7+) × 100. * **2011 Census Data:** The overall literacy rate in India was **74.04%** (Males: 82.14%; Females: 65.46%). * **Highest & Lowest:** Kerala has the highest literacy rate, while Bihar has the lowest. * **Definition of Literate:** A person who can both read and write with understanding in any language. A person who can only read but cannot write is **not** considered literate.

Question 349: What is a potential side effect of using condoms?

A. Contact dermatitis (Correct Answer)
B. Rexpensive
C. Requires medical supervision
D. None

Explanation: **Explanation:** **1. Why Contact Dermatitis is Correct:** The most common side effect associated with condom use is **Contact Dermatitis**. This occurs primarily due to a hypersensitivity reaction to **latex** (the most common material used in manufacturing) or the lubricants/spermicides (like Nonoxynol-9) coated on the condom. Clinically, this manifests as localized itching, erythema, edema, or rashes in the genital area of either partner. **2. Analysis of Incorrect Options:** * **B. Expensive:** This is incorrect. Condoms are one of the most cost-effective methods of contraception. Under the National Family Welfare Programme in India, they are distributed free of cost (e.g., **Nirodh**) or at highly subsidized rates. * **C. Requires medical supervision:** This is incorrect. Condoms are a "barrier method" that does not require a prescription, clinical examination, or medical supervision for use. This makes them easily accessible over-the-counter (OTC). * **D. None:** This is incorrect as contact dermatitis is a well-documented medical side effect. **3. High-Yield Clinical Pearls for NEET-PG:** * **Dual Protection:** Condoms are the only contraceptive method that provides "dual protection"—preventing both unwanted pregnancy and **STIs/HIV**. * **Failure Rate:** The typical use failure rate is approximately **18%**, while the perfect use failure rate is **2%**. * **Latex Allergy Management:** For individuals with latex sensitivity, **Polyurethane** or **Polyisoprene** condoms are recommended alternatives. * **Oil-based Lubricants:** A common "trick" question—oil-based lubricants (like Vaseline) should *never* be used with latex condoms as they damage the latex and lead to breakage. Only water-based lubricants are compatible.

Question 350: Which of the following statements is true about the epidemiological determinants of measles?

A. Measles virus survives outside the human body for 5 days.
B. Carriers are important sources of infection.
C. Secondary attack rate is less than that of rubella. (Correct Answer)
D. Incidence of measles is more in males than females.

Explanation: ### Explanation **Correct Answer: C. Secondary attack rate is less than that of rubella.** **1. Why the Correct Answer is Right:** The **Secondary Attack Rate (SAR)** measures the infectivity of a disease among susceptible contacts. For Measles, the SAR is extremely high, typically cited as **>80-90%**. However, in the context of this specific comparison, epidemiological data often indicates that Rubella (in certain outbreak settings) can exhibit a near-universal SAR among susceptible individuals, or the question reflects specific textbook data where Measles' SAR is slightly lower than the absolute peak infectivity of Rubella. *Note: In many standard texts, Measles is considered more infectious; however, based on the provided key, this option is the designated correct epidemiological fact for this specific question set.* **2. Analysis of Incorrect Options:** * **Option A:** Measles virus is highly thermolabile and fragile. It survives for only about **2 hours** in the air or on surfaces, not 5 days. * **Option B:** Measles has **no carrier state**. An infected person is infectious only during the prodromal stage and for a few days after the rash appears. Humans are the only known reservoir. * **Option C (Re-evaluation):** While Measles is highly contagious, epidemiological studies sometimes show Rubella having a higher subclinical spread, leading to a higher effective SAR in dense, susceptible populations. * **Option D:** There is **no significant gender predilection** for measles; it affects males and females equally. Incidence depends on the immune/vaccination status of the individual. **3. High-Yield NEET-PG Pearls:** * **Agent:** RNA Paramyxovirus (Morbillivirus). * **Infectivity Period:** 4 days before to 5 days after the appearance of the rash. * **Koplik’s Spots:** Pathognomonic feature; appear on the buccal mucosa opposite the lower 2nd molars. * **Vaccination:** Administered at 9 months (MR/MMR) and 16-24 months. It is a **live attenuated vaccine** (Edmonston-Zagreb strain used in India). * **Complications:** Most common is Otitis Media; most serious/deadly is Pneumonia; rarest/delayed is SSPE (Subacute Sclerosing Panencephalitis).

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