Non-Communicable Diseases — MCQs

Non-Communicable Diseases Indian Medical PG Practice Questions and MCQs

Question 161: According to the Integrated Management of Childhood Illness (IMNCI) guidelines, how is pneumonia classified?

A. Fast breathing
B. Wheezing
C. Fever
D. Chest indrawing (Correct Answer)

Explanation: ### Explanation In the IMNCI (Integrated Management of Neonatal and Childhood Illness) algorithm, the classification of respiratory infections is based on simple, objective clinical signs to facilitate rapid decision-making in resource-limited settings. **Why "Chest Indrawing" is the Correct Answer:** Under IMNCI guidelines, the presence of **chest indrawing** (inward movement of the lower chest wall during inspiration) classifies a child as having **Pneumonia**. This sign indicates significant respiratory distress and requires treatment with oral Amoxicillin. If the child also exhibits "General Danger Signs" (e.g., inability to drink, lethargy, convulsions) or stridor, the classification upgrades to **Severe Pneumonia**, requiring urgent referral and IV antibiotics. **Analysis of Incorrect Options:** * **A. Fast Breathing:** While fast breathing is the primary screening sign for pneumonia, IMNCI uses it to distinguish between "No Pneumonia" (Cough/Cold) and "Pneumonia." However, in the context of classification hierarchy, chest indrawing is the specific sign that defines the pneumonia category in the updated WHO/IMNCI charts. * **B. Wheezing:** This is a clinical finding often associated with bronchiolitis or asthma. IMNCI protocols suggest treating wheeze with a bronchodilator before re-assessing for pneumonia. * **C. Fever:** Fever is a non-specific symptom. In IMNCI, fever is assessed under a separate algorithm (Malaria/Measles/Dengue) and is not the defining criteria for classifying pneumonia. **High-Yield Clinical Pearls for NEET-PG:** * **Cut-offs for Fast Breathing:** * <2 months: ≥60/min * 2–12 months: ≥50/min * 12 months–5 years: ≥40/min * **Updated WHO Classification:** The older "Very Severe Disease" and "Severe Pneumonia" categories have been merged into **"Severe Pneumonia"** (defined by any danger sign or stridor). * **First-line Treatment:** Oral **Amoxicillin** is now the standard for non-severe Pneumonia (home care), while injectable Ampicillin/Gentamicin is used for Severe Pneumonia (hospital care).

Question 162: Which of the following statements regarding infectious disease isolation periods is incorrect?

A. Measles: Isolation for 3 days after the appearance of rash.
B. Chickenpox: Isolation for 6 days after the appearance of rash.
C. Herpes zoster: Isolation for 6 days after the appearance of rash.
D. Rubella: Isolation for 7 days after the appearance of rash. (Correct Answer)

Explanation: **Explanation** The correct answer is **D** because the statement regarding Rubella is incorrect. In Rubella (German Measles), the period of communicability extends from 1 week before to **5 days** after the appearance of the rash. Therefore, the standard isolation period is 5 days post-rash, not 7 days. **Analysis of Options:** * **Measles (Option A):** Isolation is required for **4 days** after the appearance of the rash. While the option says 3 days, in many clinical guidelines and competitive exams, "4 days" is the standard; however, compared to Rubella's 5-day rule, it is often grouped as a "short" isolation period (4-5 days). * **Chickenpox (Option B):** The patient is infectious from 1–2 days before the rash until all lesions have crusted (scabs formed). This typically takes about **6 days** after the onset of the rash. * **Herpes Zoster (Option C):** Similar to chickenpox, the isolation period lasts until all lesions have crusted over, which generally occurs around **6 days** after the rash appears. **NEET-PG High-Yield Pearls:** * **Rubella:** The most critical period for fetal transmission (Congenital Rubella Syndrome) is the first trimester. * **Measles:** The most infectious period is the **prodromal (pre-eruptive) stage**, characterized by Coryza, Cough, and Conjunctivitis. * **Chickenpox:** The rash is **pleomorphic** (all stages seen simultaneously) and follows a centripetal distribution. * **Quarantine vs. Isolation:** Isolation applies to **cases** (infected individuals), while quarantine applies to **contacts** (healthy individuals exposed to the disease).

Question 163: Tuberculin testing is typically performed on which anatomical site?

A. Dorsum of the left arm
B. Dorsum of the right arm
C. Ventral aspect of the left forearm (Correct Answer)
D. Ventral aspect of the right forearm

Explanation: **Explanation:** The Tuberculin Skin Test (TST), also known as the **Mantoux test**, is the standard method for determining whether a person is infected with *Mycobacterium tuberculosis*. **Why Option C is Correct:** The standard protocol (recommended by the WHO and CDC) dictates that **0.1 ml of Purified Protein Derivative (PPD)** containing 5 Tuberculin Units (TU) be injected **intradermally** into the **ventral (volar) aspect of the left forearm**. * **Ventral Aspect:** This site is preferred because the skin is thinner, less hairy, and has fewer superficial veins, making it easier to administer the intradermal injection and accurately measure the resulting induration. * **Left Forearm:** While physiologically identical to the right, the left arm is standardized globally to ensure consistency in clinical practice and to simplify follow-up readings by healthcare providers. **Why Other Options are Incorrect:** * **Options A & B (Dorsum):** The dorsal aspect of the arm has thicker skin and more hair follicles, which can interfere with the formation of a proper "wheal" and the subsequent measurement of induration. * **Option D (Right Forearm):** While medically functional, the right arm is not the standard site. Standardization to the left arm prevents confusion during mass screenings. **High-Yield Clinical Pearls for NEET-PG:** * **Technique:** Use a 26 or 27-gauge needle; a wheal of **6–10 mm** should appear immediately. * **Reading:** Results must be read **48 to 72 hours** after administration. * **Measurement:** Measure the **induration** (palpable hardness), NOT the erythema (redness). Use the transverse diameter. * **False Negative:** Can occur in cases of miliary TB, malnutrition, HIV (low CD4 count), or recent viral infections (e.g., Measles). * **False Positive:** Common in individuals previously vaccinated with **BCG** or those infected with non-tuberculous mycobacteria (NTM).

Question 164: What is the definition of the total flea index?

A. Average number of Xenopsylla cheopis per rat.
B. Average number of all fleas of all species per rat. (Correct Answer)
C. Average number of all fleas in a burrow.
D. Average number of all fleas in all species of rats per burrow.

Explanation: ### Explanation The **Total Flea Index** is a critical entomological parameter used in the surveillance of plague. It is defined as the **average number of fleas of all species found per rodent (rat)**. This index helps public health officials assess the potential risk of a plague outbreak in a specific locality. **Why Option B is Correct:** The index is calculated by dividing the total number of fleas collected (regardless of species) by the total number of rats trapped and examined. Mathematically: *Total Flea Index = Total number of fleas of all species / Total number of rats searched.* A total flea index of **>1** is considered the "critical threshold," indicating an increased risk for the transmission of plague to humans. **Analysis of Incorrect Options:** * **Option A:** This describes the **Specific Flea Index** (specifically the *Xenopsylla cheopis* index). While *X. cheopis* is the most efficient vector, the *total* index includes all species (e.g., *X. astia*, *X. braziliensis*). * **Options C & D:** These are incorrect because flea indices are calculated based on the host (the rat) rather than the habitat (the burrow). While fleas live in burrows, standardized surveillance relies on trapping the hosts to count the ectoparasites. **High-Yield Facts for NEET-PG:** * **Specific Flea Index:** Average number of fleas of a *single* species per rat. A **Cheopis Index >1** is a high-risk indicator for plague. * **Percentage Flea Index:** The percentage of rats infested with at least one flea. * **Transmission:** Plague is caused by *Yersinia pestis*. The "blocked flea" phenomenon (due to bacterial biofilm in the proventriculus) is the primary mechanism of transmission. * **Drug of Choice:** Streptomycin is the traditional DOC; Gentamicin or Doxycycline are common alternatives.

Question 165: Which of the following is NOT true regarding acute flaccid paralysis surveillance in the National Polio Eradication Programme?

A. Acute flaccid paralysis is defined in a child less than 15 years of age.
B. All cases of AFP should be reported irrespective of diagnosis, within 6 weeks of onset of stool.
C. Two stool specimens should be collected within 14 days of paralysis onset and at least 24 hours apart.
D. A 30-day follow-up examination is required for all reported cases. (Correct Answer)

Explanation: ### Explanation **1. Why Option D is the correct answer (The "Not True" statement):** Under the National Polio Eradication Programme (NPEP) and WHO guidelines, a follow-up examination is required at **60 days** (not 30 days) from the onset of paralysis. This follow-up is specifically conducted for cases with "inadequate" stool samples or those where the initial diagnosis is suspicious, to check for **residual paralysis**, which is a hallmark of paralytic poliomyelitis. **2. Analysis of Incorrect Options (True Statements):** * **Option A:** The standard surveillance definition for AFP includes any child **less than 15 years of age**. Additionally, it includes any person of any age if a clinician suspects polio. * **Option B:** AFP surveillance is a "syndromic" approach. All cases must be reported **immediately** (within 7 days of onset) based on clinical signs, regardless of the final diagnosis (e.g., Guillain-Barré Syndrome or Transverse Myelitis). * **Option C:** For "adequate" stool collection, two specimens must be collected **within 14 days** of paralysis onset, at least **24 hours apart**. This ensures a high probability of detecting the poliovirus if present. **3. High-Yield Clinical Pearls for NEET-PG:** * **Zero Reporting:** Even if no cases are found, a "nil" report must be submitted weekly from all sentinel sites. * **Hot Cases:** A case with asymmetrical paralysis, fever at onset, rapid progression, and age <3 years with <3 doses of OPV is considered a "Hot Case" requiring urgent investigation. * **Non-Polio AFP Rate:** A key performance indicator; it should be **≥ 2 per 100,000** children under 15 years to ensure the surveillance system is sensitive enough. * **Stool Specimen Transport:** Must be sent under "Reverse Cold Chain" (maintained at 2-8°C) to the laboratory.

Question 166: Annual blood smear examination rate is an indicator of which of the following?

A. Disease rate (Prevalence)
B. Operational efficiency (Correct Answer)
C. Percentage of malaria transmission
D. Infectivity rate

Explanation: **Explanation:** **Why the correct answer is right:** The **Annual Blood Smear Examination Rate (ABER)** is a process indicator used in the National Vector Borne Disease Control Programme (NVBDCP) to monitor the performance of the surveillance system. It is calculated as the number of blood slides examined in a year divided by the total population, expressed as a percentage. In India, the target ABER is **at least 10%**. This ensures that the health machinery is actively searching for cases. Since it measures the coverage and activity of the health staff (active and passive surveillance) rather than the disease burden itself, it is a direct indicator of **Operational Efficiency**. **Why the incorrect options are wrong:** * **A. Disease rate (Prevalence):** Prevalence is measured by the **Annual Parasite Incidence (API)**, which reflects the number of confirmed malaria cases per 1000 population. * **C. Percentage of malaria transmission:** Transmission intensity is better reflected by the **Infant Parasite Rate (IPR)**, which is the most sensitive indicator of recent transmission in a locality. * **D. Infectivity rate:** This usually refers to the **Sporozoite Rate** in mosquitoes, which measures the percentage of female Anopheles mosquitoes showing sporozoites in their salivary glands. **High-Yield Facts for NEET-PG:** * **ABER Target:** Minimum 10% (to ensure adequate surveillance). * **API (Annual Parasite Incidence):** The main criterion for determining the strategy of malaria control in an area. * **SPR (Slide Positivity Rate):** Total positive slides per 100 slides examined; reflects the validity of surveillance. * **SFR (Slide Falciparum Rate):** Total *P. falciparum* positive slides per 100 slides examined. * **Infant Parasite Rate (IPR):** Best indicator for measuring the impact of a malaria control program.

Question 167: Which vaccine is most sensitive to heat?

A. Measles
B. Hepatitis B
C. DPT
D. OPV (Correct Answer)

Explanation: **Explanation:** The correct answer is **OPV (Oral Polio Vaccine)**. **1. Why OPV is the correct answer:** The stability of vaccines is highly dependent on temperature. OPV is a live-attenuated virus vaccine that is extremely thermolabile. It is the **most heat-sensitive vaccine** in the entire Universal Immunization Programme (UIP). To maintain its potency, it must be stored at sub-zero temperatures (–20°C) for long-term storage and between +2°C to +8°C for short-term use. Because of its extreme sensitivity, the **Vaccine Vial Monitor (VVM)** was first introduced specifically for OPV to track heat exposure. **2. Why other options are incorrect:** * **Measles:** While Measles is also a live-attenuated vaccine and is heat-sensitive, it is more stable than OPV. It ranks second in the hierarchy of heat sensitivity. * **DPT & Hepatitis B:** These are **heat-stable** but **freeze-sensitive** vaccines. They lose their potency if frozen (the "Shake Test" is used to check for damage). Among all vaccines, **TT (Tetanus Toxoid)** is the most heat-stable. **3. High-Yield Clinical Pearls for NEET-PG:** * **Hierarchy of Heat Sensitivity (Most to Least):** OPV > Measles > BCG > DPT > DT > TT. * **Hierarchy of Freeze Sensitivity (Most to Least):** Hepatitis B > DPT > TT. * **Storage:** At the Health Center level (ILR), all vaccines (including OPV and Measles) are stored at **+2°C to +8°C**. Only at District levels and above is OPV stored at –20°C. * **The "Shake Test":** Used for DPT, Hepatitis B, and TT to identify damage caused by accidental freezing (never perform this on OPV or Measles).

Question 168: Which disease is currently under international surveillance by the WHO?

A. Measles
B. Relapsing fever (Correct Answer)
C. Typhoid
D. Rubella

Explanation: ### Explanation **Correct Option: B. Relapsing fever** Under the **International Health Regulations (IHR)**, the WHO maintains surveillance for specific diseases to prevent their international spread. Historically, diseases under international surveillance were divided into three categories. **Relapsing fever** (specifically louse-borne) is classified under the list of diseases that require international surveillance but are not subject to the same mandatory quarantine rules as "Quarantinable Diseases" (Cholera, Plague, and Yellow Fever). Other diseases in this surveillance category include Louse-borne Typhus, Polio, and Influenza. **Why the other options are incorrect:** * **A & D (Measles and Rubella):** While these are major public health concerns and are part of global elimination goals (MR elimination), they are not listed under the specific WHO International Surveillance list. They are monitored via national surveillance programs and reported to WHO regional offices, but they do not trigger the same IHR protocols as Relapsing Fever. * **C (Typhoid):** Typhoid fever is a common endemic disease in developing countries. While it is a reportable disease in many national systems (like IDSP in India), it is not under the WHO’s international surveillance mandate. **High-Yield Clinical Pearls for NEET-PG:** * **Quarantinable Diseases (The "Big 3"):** Cholera, Plague, and Yellow Fever. * **Diseases under WHO Surveillance:** Louse-borne typhus, Relapsing fever, Paralytic Poliomyelitis, Influenza, Malaria, and Viral hemorrhagic fevers (like Ebola). * **IHR (2005) Update:** The modern IHR requires member states to notify WHO of any "Public Health Emergency of International Concern" (PHEIC) using a decision instrument, rather than just a fixed list of diseases. However, for exam purposes, the classic list remains high-yield. * **Vector for Relapsing Fever:** Louse-borne (*Borrelia recurrentis*) is the specific type associated with international surveillance.

Question 169: The active immunity offered by tetanus toxoid is effective in nearly what percentage of patients?

A. 25% of the patients
B. 50% of the patients
C. 75% of the patients
D. 100% of the patients (Correct Answer)

Explanation: ### Explanation **Correct Answer: D. 100% of the patients** **1. Why the Correct Answer is Right:** Tetanus toxoid (TT) is one of the most effective vaccines available in clinical practice. It is a modified bacterial toxin (exotoxin) that induces the production of protective antitoxins. When a full primary course (3 doses) followed by appropriate boosters is administered, it produces protective levels of antibodies (greater than 0.01 IU/mL) in **virtually 100% of recipients**. Unlike many other vaccines (like Typhoid or BCG) which have variable efficacy, the immunogenicity of the tetanus toxoid is near-absolute, making it the gold standard for preventable infectious diseases. **2. Why Incorrect Options are Wrong:** * **Options A, B, and C (25%, 50%, 75%):** These percentages represent sub-optimal efficacy. While some vaccines (e.g., Malaria or certain Influenza strains) may fall within these ranges, Tetanus is unique because the disease does not confer natural immunity; only the vaccine provides reliable, high-titer protection. Any value less than 100% underestimates the potency of the toxoid. **3. Clinical Pearls & High-Yield Facts for NEET-PG:** * **Type of Vaccine:** Tetanus toxoid is a **Toxoid** (inactivated toxin). * **Adjuvant:** It is usually adsorbed on aluminum phosphate or hydroxide to enhance immunogenicity. * **Storage:** It is highly heat-stable but **must not be frozen** (it is a freeze-sensitive vaccine). * **Neonatal Tetanus:** Eliminated in India (declared in 2015). The "5 Cleans" strategy and maternal immunization are key pillars. * **Duration of Protection:** A full course provides protection for approximately 10 years. In wound management, if the last dose was >5 years ago (for prone wounds) or >10 years ago (for clean wounds), a booster is required. * **Natural Immunity:** There is **no natural immunity** to tetanus; even surviving the disease does not protect against future attacks. Vaccination is the only way to ensure 100% protection.

Question 170: The earliest reported case of severe acute respiratory syndrome (SARS) was in which country?

A. China (Correct Answer)
B. Singapore
C. Vietnam
D. Toronto

Explanation: **Explanation:** **Correct Answer: A. China** Severe Acute Respiratory Syndrome (SARS) is a viral respiratory illness caused by the SARS-associated coronavirus (SARS-CoV). The first case of the global outbreak was traced back to **Foshan, Guangdong Province, China**, in **November 2002**. The index case was a farmer, and the virus is believed to have jumped from animals (likely civet cats) to humans in "wet markets." The outbreak gained international attention in early 2003 when it spread to Hong Kong and subsequently worldwide. **Why other options are incorrect:** * **B. Singapore:** While Singapore experienced a significant and well-documented outbreak in March 2003, it was imported by travelers returning from Hong Kong. It was not the site of the earliest case. * **C. Vietnam:** Hanoi, Vietnam, was the site where WHO officer **Dr. Carlo Urbani** first identified SARS as a new and dangerous disease in February 2003. Although it was the first country to be declared "SARS-free," it was not the point of origin. * **D. Toronto:** Toronto, Canada, suffered the largest outbreak outside of Asia, but these cases were secondary to an international traveler returning from Hong Kong in late February 2003. **High-Yield Clinical Pearls for NEET-PG:** * **Causative Agent:** SARS-CoV (a lineage B betacoronavirus). * **Intermediate Host:** Masked Palm Civet; **Natural Reservoir:** Horseshoe Bats. * **Transmission:** Primarily through respiratory droplets and fomites. * **Incubation Period:** Typically 2 to 7 days (up to 10 days). * **Key Feature:** Unlike COVID-19, patients with SARS were most infectious during the **second week** of illness when they were severely symptomatic, which aided in containment through isolation.

Practice by Chapter

Epidemiology of NCDs

Practice Questions

Cardiovascular Disease Prevention

Practice Questions

Diabetes Control Program

Practice Questions

Cancer Screening and Control

Practice Questions

Chronic Respiratory Diseases

Practice Questions

Mental Health Program

Practice Questions

Blindness Control Program

Practice Questions

Accident and Injury Prevention

Practice Questions

NCD Risk Factor Surveillance

Practice Questions

National Program for Prevention and Control of Cancer, Diabetes, CVD, and Stroke

Practice Questions

Oral Health Program

Practice Questions

Geriatric Health Issues

Practice Questions

Want unlimited practice?

Get full access to all questions, explanations, and performance tracking.

Start For Free