Non-Communicable Diseases — MCQs

Non-Communicable Diseases Indian Medical PG Practice Questions and MCQs

Question 51: Which of the following conditions does NOT typically present with a healthy carrier state?

A. Polio
B. Measles (Correct Answer)
C. Cholera
D. Diphtheria

Explanation: **Explanation:** The concept of a **carrier state** refers to an infected individual who harbors a specific infectious agent without having clinical disease but serves as a potential source of infection for others. **Why Measles is the Correct Answer:** Measles is characterized by a **"hit and run"** strategy. It is an acute, highly infectious viral disease where the virus must find a new susceptible host immediately after the clinical phase. There is **no chronic or healthy carrier state** in Measles; an individual is either susceptible, acutely ill, or immune. Once the clinical course is over, the virus is cleared from the body, and the individual develops lifelong immunity. **Analysis of Incorrect Options:** * **Polio:** Known for a significant healthy carrier state. For every one clinical case of paralytic polio, there are hundreds of "inapparent" or subclinical infections (carriers) who shed the virus in their stools. * **Cholera:** Presents with both temporary (convalescent) and healthy carriers. These individuals shed *Vibrio cholerae* in their feces without showing symptoms of diarrhea, playing a major role in the endemicity of the disease. * **Diphtheria:** This is a classic example of a disease with a healthy carrier state. The bacteria (*Corynebacterium diphtheriae*) colonize the throat or nose of individuals who remain asymptomatic but can spread the infection to others. **NEET-PG High-Yield Pearls:** * **Diseases with NO carrier state:** Measles, Pertussis, Smallpox, and Rabies. * **Epidemiological Significance:** Diseases without a carrier state are generally easier to eradicate (e.g., Smallpox) because there is no "hidden" reservoir in the population. * **Measles Infectivity:** The period of communicability is 4 days before to 4 days after the appearance of the rash.

Question 52: Arrange the following stages of the family life cycle in chronological sequence:

A. Formation, Extension, Complete extension, Dissolution, Contraction, Complete contraction
B. Formation, Extension, Contraction, Complete extension, Complete contraction, Dissolution
C. Formation, Contraction, Complete contraction, Extension, Complete extension, Dissolution
D. Formation, Extension, Complete extension, Contraction, Complete contraction, Dissolution (Correct Answer)

Explanation: ### Explanation: The Family Life Cycle The concept of the **Family Life Cycle** is a high-yield topic in Community Medicine, describing the natural progression of a family unit over time. This sequence is vital for understanding the demographic and health needs of a population at different stages. #### 1. Why Option D is Correct The correct chronological sequence follows the biological and social evolution of a nuclear family: 1. **Formation:** Starts with marriage (the union of two individuals). 2. **Extension:** Begins with the birth of the first child. 3. **Complete Extension:** Ends with the birth of the last child (the family is at its maximum size). 4. **Contraction:** Begins when the first child leaves the home (e.g., for marriage or employment). 5. **Complete Contraction:** Ends when the last child leaves the home (only the original couple remains). 6. **Dissolution:** Occurs with the death of one of the spouses. #### 2. Why Other Options are Wrong * **Option A:** Incorrectly places **Dissolution** before **Contraction**. Dissolution is always the final stage. * **Option B:** Places **Contraction** before **Complete Extension**. A family cannot begin to contract (children leaving) until it has finished extending (all children born). * **Option C:** Incorrectly suggests that **Contraction** happens before **Extension**, which is biologically impossible in the standard cycle. #### 3. Clinical Pearls & High-Yield Facts for NEET-PG * **Health Needs:** Different stages have specific health priorities. **Extension** focuses on Maternal and Child Health (MCH), while **Contraction/Dissolution** focuses on Geriatric care and Non-Communicable Diseases (NCDs). * **The "Empty Nest" Syndrome:** This typically occurs during the **Complete Contraction** phase, leading to psychological issues like depression or loneliness in parents. * **Dependency Ratio:** The family's economic dependency is usually highest at the end of the **Complete Extension** phase. * **Note:** This cycle primarily describes the "Nuclear Family" model; variations exist in joint family systems.

Question 53: All of the following are true regarding the inactivated polio vaccine (IPV) except?

A. It produces circulatory antibodies.
B. It does not require stringent refrigeration.
C. It provides immunity against paralytic and wild strains. (Correct Answer)
D. It is not effective in an epidemic situation.

Explanation: **Explanation:** The question asks for the **incorrect** statement regarding the Inactivated Polio Vaccine (IPV/Salk vaccine). **1. Why Option C is the Correct Answer (The Incorrect Statement):** While IPV is highly effective at preventing paralytic poliomyelitis by inducing systemic immunity, it **does not prevent infection with wild poliovirus**. IPV induces humoral (IgG) immunity but fails to produce significant local intestinal (IgA) immunity. Therefore, a person vaccinated with IPV can still be infected by wild poliovirus; the virus can multiply in their gut and be excreted in feces, potentially spreading the infection to others in the community. In contrast, the Oral Polio Vaccine (OPV) provides robust intestinal immunity, effectively blocking the transmission of wild strains. **2. Analysis of Other Options:** * **Option A (True):** IPV is an injectable vaccine that induces high levels of circulating serum antibodies (IgG, IgM), which prevent the virus from reaching the central nervous system. * **Option B (True):** IPV is more heat-stable than OPV. While it still requires a cold chain (2°C to 8°C), it does not require the stringent sub-zero freezing temperatures often necessary for long-term OPV storage. * **Option C (True):** IPV is not the vaccine of choice during an epidemic because it does not induce "herd immunity" through intestinal resistance and lacks the "contact vaccination" effect seen with OPV. **High-Yield NEET-PG Pearls:** * **Vaccine Type:** IPV is a "killed" vaccine (Salk), while OPV is "live-attenuated" (Sabin). * **Current Schedule (India):** Under the Universal Immunization Programme (UIP), **Fractional IPV (fIPV)** is administered intradermally (0.1 ml) at 6, 14 weeks, and 9 months. * **VAPP & VDPV:** IPV carries zero risk of Vaccine-Associated Paralytic Polio (VAPP) or Vaccine-Derived Poliovirus (VDPV), making it safer for immunocompromised individuals.

Question 54: Smallpox eradication was successful because of all the following factors except:

A. Subclinical cases do not transmit the disease
B. A highly effective vaccine was available
C. The disease conferred lifelong immunity
D. Cross-resistance existed with animal pox viruses (Correct Answer)

Explanation: **Explanation:** The eradication of Smallpox (declared by the WHO on May 8, 1980) is a landmark achievement in public health. The correct answer is **Option D** because cross-resistance with animal pox viruses was **not** a factor that contributed to its eradication. In fact, the Variola virus (Smallpox) was strictly a human pathogen with no animal reservoir, which was a primary reason why eradication was possible. **Why the other options are incorrect (Factors that DID help eradication):** * **A. Subclinical cases do not transmit the disease:** Smallpox was always clinically apparent. Since there were no asymptomatic carriers or subclinical infections spreading the virus silently, health workers could easily identify, isolate, and trace contacts (the "Ring Vaccination" strategy). * **B. Highly effective vaccine:** The bifurcated needle and the heat-stable lyophilized vaccine allowed for easy administration and potency in tropical climates without a strict cold chain. * **C. Lifelong immunity:** A single infection or successful vaccination provided long-lasting, solid immunity, preventing re-infection within the population. **High-Yield NEET-PG Pearls:** * **Last Case:** The last naturally occurring case of *Variola major* was in **Rahima Banu** (Bangladesh, 1975); the last case of *Variola minor* was in **Ali Maow Maalin** (Somalia, 1977). * **Strategy Shift:** Eradication was achieved by shifting from "Mass Vaccination" to **"Surveillance and Containment"** (Ring Vaccination). * **Incubation Period:** 7–14 days (highly predictable). * **Key Biological Feature:** No animal reservoir and no chronic carrier state. If a virus cannot hide in animals or asymptomatic humans, it can be eliminated.

Question 55: Which of the following is NOT true about dengue?

A. Aedes aegypti is the vector
B. Caused by a flavivirus
C. Malnutrition is protective
D. Lamivudine is the drug of choice (Correct Answer)

Explanation: **Explanation:** The correct answer is **D (Lamivudine is the drug of choice)** because there is currently no specific antiviral therapy for Dengue. Management is primarily **supportive**, focusing on fluid replacement and monitoring for complications like Dengue Hemorrhagic Fever (DHF). Lamivudine is a nucleoside reverse transcriptase inhibitor (NRTI) used for HIV and Hepatitis B, not Dengue. **Analysis of other options:** * **Option A:** *Aedes aegypti* is indeed the primary vector. It is a day-biting mosquito that typically breeds in artificial collections of clean water (e.g., desert coolers, flower pots). * **Option B:** Dengue is caused by the **Dengue Virus (DENV)**, which belongs to the family *Flaviviridae* and genus *Flavivirus*. There are four distinct serotypes (DEN-1 to DEN-4). * **Option C:** Interestingly, **malnutrition is considered protective** against the severe forms of Dengue (DHF/DSS). This is because the pathogenesis of DHF involves a robust immune response (cytokine storm); malnourished children often have a suppressed immune system, which paradoxically reduces the severity of the plasma leak. **High-Yield Clinical Pearls for NEET-PG:** * **Vector:** *Aedes aegypti* is also known as the "Tiger Mosquito" due to white stripes on its body. * **Incubation Period:** 3 to 10 days. * **Diagnosis:** NS1 Antigen (Day 1–5), IgM/IgG ELISA (after Day 5). * **Tourniquet Test:** Used as a screening tool for capillary fragility; >20 petechiae per square inch is positive. * **Warning Signs:** Abdominal pain, persistent vomiting, mucosal bleed, and a rapid drop in platelet count with a rise in hematocrit.

Question 56: When did the WHO declare the global eradication of smallpox?

A. 26th October 1977
B. 5th July 1975
C. 17th May 1975
D. 8th May 1980 (Correct Answer)

Explanation: **Explanation:** The correct answer is **8th May 1980**. This date marks a monumental milestone in public health history when the **33rd World Health Assembly** officially declared the global eradication of smallpox. Smallpox remains the only human infectious disease to be completely eradicated through vaccination. **Analysis of Options:** * **8th May 1980 (Correct):** The official date of the WHO declaration of global eradication. * **26th October 1977:** This is the date of the **last naturally occurring case** of Smallpox (*Variola minor*) in the world, reported in Ali Maow Maalin in Merca, Somalia. * **5th July 1975:** This marks the date of the **last case of Smallpox in India** (specifically, the last case of *Variola major* in a patient named Rahima Banu in Bangladesh occurred later in Oct 1975, but India was declared smallpox-free in April 1977). * **17th May 1975:** This is a distractor date often confused with the timeline of the National Smallpox Eradication Programme (NSEP) in India. **High-Yield Clinical Pearls for NEET-PG:** * **Eradication vs. Elimination:** Eradication refers to the global extinction of the pathogen (Smallpox), while elimination refers to the interruption of transmission in a specific geographic area (e.g., Polio in India). * **Vaccine Type:** The Smallpox vaccine used the **Live Vaccinia virus** (not Variola). * **Last Case (Lab Accident):** The absolute last human case occurred in **1978** due to a laboratory accident in Birmingham, UK (Janet Parker). * **Bifurcated Needle:** The specific tool used for the "Multiple Puncture Method" of vaccination, which was crucial for the eradication campaign.

Question 57: What will be the BMI of a male whose weight is 89 kg and height is 172 cm?

A. 27
B. 30 (Correct Answer)
C. 33
D. 36

Explanation: **Explanation:** **1. Calculation & Correct Answer:** Body Mass Index (BMI), also known as Quetelet’s Index, is a key anthropometric measure used to classify nutritional status. The formula is: **BMI = Weight (kg) / [Height (m)]²** * **Step 1:** Convert height from cm to meters: $172\text{ cm} = 1.72\text{ m}$. * **Step 2:** Square the height: $1.72 \times 1.72 = 2.9584$. * **Step 3:** Divide weight by height squared: $89 / 2.9584 \approx 30.08$. Rounding to the nearest whole number gives **30**, making Option B the correct answer. **2. Analysis of Incorrect Options:** * **Option A (27):** This would be the result if the weight were approximately 80 kg. A BMI of 27 falls under the "Overweight" category. * **Option C (33):** This would require a weight of approximately 98 kg. This falls under Class I Obesity. * **Option D (36):** This would require a weight of approximately 106 kg. This falls under Class II Obesity. **3. High-Yield Clinical Pearls for NEET-PG:** * **WHO Classification (Global):** * Underweight: $<18.5$ * Normal: $18.5–24.9$ * Overweight: $25–29.9$ * Obesity: $\geq 30$ (Class I: $30–34.9$; Class II: $35–39.9$; Class III: $\geq 40$) * **Revised Classification for Asians (India):** Due to higher body fat percentages at lower BMIs, the cut-offs are lower: * Normal: $18.5–22.9\text{ kg/m}^2$ * Overweight: $23–24.9\text{ kg/m}^2$ * Obesity: $\geq 25\text{ kg/m}^2$ * **Ponderal Index:** $\text{Weight (kg)} / \text{Height (m)}^3$. It is considered more sensitive than BMI for certain populations. * **Corpulence Index:** Actual weight / Desired weight.

Question 58: What is the threshold level of herd immunity for Pertussis?

A. 80%
B. 70%
C. 90% (Correct Answer)
D. 50%

Explanation: **Explanation:** The threshold level of herd immunity is the proportion of a population that must be immune to an infectious disease to stop its transmission. This threshold is directly determined by the **Basic Reproduction Number ($R_0$)**, which represents the average number of secondary cases generated by one primary case in a totally susceptible population. **1. Why 90% is Correct:** Pertussis (Whooping Cough) is highly contagious, with an $R_0$ estimated between **12 and 17**. The formula for Herd Immunity Threshold (HIT) is $1 - (1/R_0)$. For Pertussis, this calculation yields a requirement of approximately **92–94%**. In standardized medical examinations like NEET-PG, **90-95%** is the recognized range, making **90%** the most accurate option provided. **2. Why Other Options are Incorrect:** * **80% (Option A):** This level is sufficient for diseases with lower $R_0$ values, such as Polio or Diphtheria, but is inadequate to prevent outbreaks of Pertussis. * **70% (Option B):** This is often cited as the threshold for Rubella or Mumps, which are less infectious than Pertussis. * **50% (Option C):** This level is far too low for most vaccine-preventable childhood diseases and would result in sustained community transmission. **High-Yield Clinical Pearls for NEET-PG:** * **Highest Herd Immunity Threshold:** Measles requires the highest threshold (**94–95%**) because it has the highest $R_0$ (12–18). * **Diphtheria:** Threshold is approximately **85%**. * **Polio:** Threshold is approximately **80%**. * **Concept:** Herd immunity applies only to diseases that spread from **person to person**. It does not apply to **Tetanus**, as it is not communicable.

Question 59: A person's height is 174 cm and their weight is 89 kg. What is their BMI classification?

A. Underweight
B. Normal weight
C. Pre-obese (Correct Answer)
D. Obese

Explanation: **Explanation:** To determine the BMI classification, we first calculate the Body Mass Index (BMI) using Quetelet’s Index formula: **BMI = Weight (kg) / [Height (m)]²** 1. **Conversion:** Height = 174 cm = 1.74 m. 2. **Calculation:** BMI = 89 / (1.74 × 1.74) = 89 / 3.0276 ≈ **29.4 kg/m²**. According to the **WHO Classification of BMI**, a value of 29.4 kg/m² falls into the **Pre-obese** category (25.00 – 29.99 kg/m²). **Analysis of Options:** * **A. Underweight:** Defined as a BMI **< 18.5 kg/m²**. * **B. Normal weight:** Defined as a BMI between **18.5 – 24.99 kg/m²**. * **C. Pre-obese (Correct):** Defined as **25.0 – 29.99 kg/m²**. This is the stage where intervention is most effective to prevent clinical obesity. * **D. Obese:** Defined as a BMI **≥ 30 kg/m²**. (Obese Class I: 30–34.9; Class II: 35–39.9; Class III: ≥ 40). **High-Yield NEET-PG Pearls:** * **Asian-Indian Specific Criteria:** For the Indian population, the cut-offs are lower due to higher body fat percentages at lower BMIs. Normal: 18.5–22.9; Overweight/Pre-obese: **23–24.9**; Obese: **≥ 25**. * **Ponderal Index:** Calculated as $Height (cm) / \sqrt[3]{Weight (kg)}$. It is considered a more sensitive indicator of physical build than BMI. * **Waist-Hip Ratio (WHR):** A better predictor of metabolic risk than BMI. Risk increases if WHR is **> 0.9 in men** or **> 0.85 in women**.

Question 60: According to the new WHO 2013 malaria treatment guidelines, which of the following statements is true?

A. Artemisinin-based combination therapy (ACT) is not used in falciparum malaria.
B. Presumptive treatment with chloroquine should be given.
C. Primaquine is contraindicated in infants and pregnant women. (Correct Answer)
D. Primaquine is to be given for 7 days in falciparum malaria.

Explanation: ### Explanation **Correct Answer: C. Primaquine is contraindicated in infants and pregnant women.** **Why it is correct:** Primaquine is an 8-aminoquinoline used to eliminate gametocytes (in *P. falciparum*) and hypnozoites (in *P. vivax/ovale*). It is strictly contraindicated in **pregnant women** and **infants under 6 months** (or those breastfeeding infants under 6 months) because it can cross the placenta and enter breast milk, potentially causing severe **hemolysis** in a fetus or neonate who may be G6PD deficient. Before administration, G6PD status should ideally be checked to prevent acute hemolytic anemia. **Why the other options are incorrect:** * **Option A:** ACT is actually the **first-line treatment** for uncomplicated *P. falciparum* malaria globally. * **Option B:** The 2013 guidelines (and subsequent updates) emphasize **parasitological confirmation** (via Microscopy or RDT) before starting treatment. Presumptive treatment is no longer recommended unless diagnostic tools are completely unavailable. * **Option C:** In *P. falciparum* malaria, Primaquine is given as a **single dose (0.25 mg/kg)** on Day 2 as a gametocide to prevent transmission. A 7-day or 14-day course is reserved for the radical cure of *P. vivax* to prevent relapse. **High-Yield Clinical Pearls for NEET-PG:** * **Drug of Choice (DOC):** ACT is the DOC for *P. falciparum*. In India, the preferred ACT is Artesunate + Sulfadoxine-Pyrimethamine (AS+SP), except in North-Eastern states where Artemether-Lumefantrine is used due to resistance. * **Pregnancy:** In the 1st trimester of pregnancy, the DOC for *P. falciparum* is **Quinine** (though recent WHO updates now allow ACT if Quinine is unavailable). * **Primaquine Dose:** Single dose (0.25 mg/kg) for *P. falciparum*; 14 days (0.25 mg/kg/day) for *P. vivax* radical cure.

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