Community Medicine
3 questionsWhich of the following vaccines is not typically given in disaster situations?
In the context of disease screening, which type of lead time is most beneficial for effective screening?
What is the annual infection rate of tuberculosis?
NEET-PG 2013 - Community Medicine NEET-PG Practice Questions and MCQs
Question 681: Which of the following vaccines is not typically given in disaster situations?
- A. Influenza (Correct Answer)
- B. Measles
- C. Cholera
- D. Tetanus
Explanation: ***Influenza*** - **Influenza vaccination** is generally **NOT a priority** in acute disaster response and emergency vaccination campaigns. - While influenza can spread in crowded conditions, routine disaster response protocols focus on **immediately life-threatening and epidemic-prone diseases** rather than seasonal respiratory infections. - Influenza vaccination requires **cold chain maintenance** and repeated doses, making it logistically challenging in emergency settings. - WHO and SPHERE guidelines do not list influenza among priority vaccines for disaster situations unless there is a specific ongoing outbreak. *Cholera* - **Oral cholera vaccine (OCV)** is increasingly recommended by WHO for disaster settings with **high cholera risk**, particularly in areas with poor water and sanitation. - Modern OCVs (like Shanchol and Euvichol) have improved **cost-effectiveness** and logistics, making them viable for mass campaigns. - Used in conjunction with **WASH interventions** (water, sanitation, hygiene) for comprehensive cholera control. *Measles* - **Measles vaccination** is the **highest priority** vaccine in disaster response, particularly for children aged 6 months to 15 years. - Its **extreme contagiousness** (R0 = 12-18) and high mortality in malnourished populations make it critical. - WHO recommends measles vaccination within the **first days** of a disaster response in displacement settings. *Tetanus* - **Tetanus toxoid** (often as Td or DT) is essential in disasters involving injuries, floods, earthquakes, or debris. - Protects against **_Clostridium tetani_** infection from contaminated wounds. - Part of standard **wound management protocols** in emergency medical care.
Question 682: In the context of disease screening, which type of lead time is most beneficial for effective screening?
- A. Short lead time
- B. Both short and long lead times are beneficial
- C. Long lead time is beneficial for screening (Correct Answer)
- D. Lead time has no impact on screening effectiveness
Explanation: ***Long lead time is beneficial for screening*** - **Long lead time** provides a greater window of opportunity between disease detection by screening and clinical symptom onset - This extended asymptomatic detectable phase allows for **early intervention** when treatments are most effective - Longer lead time correlates with improved prognosis and potential prevention of severe outcomes - Essential criterion for effective screening programs per **Wilson-Jungner criteria** *Short lead time* - Limited time between disease detectability and clinical symptoms - Reduces screening effectiveness as disease progresses rapidly - Minimal opportunity for beneficial early intervention *Both short and long lead times are beneficial* - Only **long lead time** is beneficial for screening programs - Short lead time actually limits screening effectiveness - Screening benefit is directly proportional to duration of asymptomatic detectable phase *Lead time has no impact on screening effectiveness* - **Lead time is crucial** for determining screening program effectiveness - Directly impacts the window for early detection and intervention - Without adequate lead time, screening loses its preventive value
Question 683: What is the annual infection rate of tuberculosis?
- A. Percentage of total patients positive for tuberculin test
- B. Percentage of new patients positive for tuberculin test (Correct Answer)
- C. Percentage of sputum positive total patients
- D. Percentage of sputum positive new patients
Explanation: ***Percentage of new patients positive for tuberculin test*** - The **annual infection rate of tuberculosis (AIRT)** is defined as the percentage of individuals (typically children aged 1-9 years) who show **tuberculin conversion** (from negative to positive) in a given year. - Among the given options, this is the **closest representation** as it focuses on **newly infected individuals** rather than prevalent cases. - AIRT is a key epidemiological indicator reflecting **ongoing transmission** and the **annual risk of tuberculous infection** in a community. - This measure helps assess TB control program effectiveness and disease burden. *Percentage of total patients positive for tuberculin test* - This represents the **prevalence of tuberculosis infection** in the population, including both old and new infections. - It does not specifically measure the **annual rate of acquiring new infections**, which is what AIRT captures. *Percentage of sputum positive total patients* - This indicates the **prevalence of active, infectious pulmonary tuberculosis** in a population. - It refers to individuals with **active TB disease** who are shedding bacteria in sputum, not latent infection detected by tuberculin testing. *Percentage of sputum positive new patients* - This represents the **incidence of new, active, infectious tuberculosis cases** (case detection rate). - While important for TB surveillance, it measures **active disease** rather than **infection rate** detected by tuberculin skin test.
Internal Medicine
2 questionsWhich of the following characteristics can be used to differentiate the rash of chickenpox from the rash of smallpox?
Most common cause of death in diphtheria is due to
NEET-PG 2013 - Internal Medicine NEET-PG Practice Questions and MCQs
Question 681: Which of the following characteristics can be used to differentiate the rash of chickenpox from the rash of smallpox?
- A. Deep-seated
- B. Pleomorphic (Correct Answer)
- C. Centrifugal
- D. Multilocular
Explanation: ***Pleomorphic*** - The rash of **chickenpox** is **pleomorphic**, meaning lesions at various stages of development (macules, papules, vesicles, scabs) are present simultaneously in the same body area. - In contrast, a **smallpox** rash is **monomorphic**, with all lesions in a given area appearing at the same stage of development. *Centrifugal* - A **centrifugal distribution** (lesions more concentrated on the face and extremities) is characteristic of **smallpox**. - **Chickenpox** typically has a **centripetal distribution**, with lesions more concentrated on the trunk. *Deep-seated* - **Smallpox** lesions are described as **deep-seated** and feel like "shot under the skin," often associated with significant scarring. - **Chickenpox** lesions are superficial and less likely to cause scarring unless secondarily infected. *Multilocular* - **Smallpox** vesicles and pustules are typically **multilocular**, meaning they have internal septations and do not collapse when punctured. - **Chickenpox** vesicles are unilocular, appearing as a single compartment, and collapse when punctured.
Question 682: Most common cause of death in diphtheria is due to
- A. Airway obstruction
- B. Septic shock
- C. Toxic cardiomyopathy (Correct Answer)
- D. Descending polyneuropathy (rare)
Explanation: ***Toxic cardiomyopathy*** - Diphtheria toxin primarily targets and damages the **myocardium**, leading to heart failure, arrhythmias, and ultimately death. - Myocardial damage can occur even in mild cases and is the most frequent cause of **fatality** in both treated and untreated diphtheria. *Airway obstruction* - While significant **pharyngeal and laryngeal pseudomembrane formation** can cause severe respiratory distress and obstruction, it is not the most common cause of death overall. - Prompt medical intervention, such as **tracheostomy** or antitoxin administration, can often alleviate acute airway issues. *Septic shock* - Diphtheria itself is a **toxin-mediated disease**, not typically characterized by overwhelming bacterial sepsis leading to septic shock as the primary cause of death. - While secondary infections can occur, direct **toxin-induced organ damage** is the main concern. *Descending polyneuropathy (rare)* - **Neurological complications**, such as polyneuropathy, can occur later in the course of diphtheria due to toxin effects. - However, these are generally less common and less immediately life-threatening than **cardiac complications**, and rarely the direct cause of death.
Pediatrics
3 questionsWhich immunization is typically given at 6 months of age?
2 months old child having birth weight 2kg, with poor feeding, very sleepy and wheezing. The diagnosis is?
A 3-month-old infant with no chest indrawing and a respiratory rate of 52/minute. The diagnosis is:
NEET-PG 2013 - Pediatrics NEET-PG Practice Questions and MCQs
Question 681: Which immunization is typically given at 6 months of age?
- A. Measles vaccine
- B. DPT vaccine (Correct Answer)
- C. BCG vaccine
- D. None of the options
Explanation: **DPT vaccine** - The DPT (diphtheria, pertussis, and tetanus) vaccine is administered in multiple doses during infancy as part of the primary immunization series. - At **6 months of age**, the **third dose of DPT** is typically given (following doses at 6 weeks, 10 weeks, and 14 weeks according to the Indian immunization schedule). - Among the options provided, DPT is the only vaccine routinely administered at 6 months of age. - This vaccine protects against three serious bacterial infections: **diphtheria**, which can cause breathing problems; **pertussis (whooping cough)**, a severe respiratory illness; and **tetanus**, which causes painful muscle spasms. *Measles vaccine* - The measles vaccine (given as part of the **MMR vaccine** or as MR vaccine in India) is typically administered at **9 to 12 months of age** for the first dose, and a second dose between 15-18 months or 4-6 years. - It is not routinely given at 6 months, as maternal antibodies can interfere with its effectiveness at this younger age. *BCG vaccine* - The BCG (Bacillus Calmette-Guérin) vaccine protects against **tuberculosis** and is given at **birth** or in early infancy as a single dose. - It is not administered at 6 months of age. *None of the options* - This option is incorrect because the **DPT vaccine** (third dose) is a standard immunization given at 6 months of age according to the Indian immunization schedule. - Multiple vaccines are actually given at 6 months (including OPV, Hepatitis B, Hib, PCV), but among the listed options, only DPT is correct.
Question 682: 2 months old child having birth weight 2kg, with poor feeding, very sleepy and wheezing. The diagnosis is?
- A. Very severe disease (Correct Answer)
- B. No evidence of pneumonia
- C. Severe respiratory infection
- D. No diagnosis
Explanation: ***Very severe disease*** - According to **WHO/IMNCI (Integrated Management of Neonatal and Childhood Illness) classification** for young infants (0-2 months), the presence of **danger signs** automatically classifies the condition as "Very severe disease" - This infant presents with two critical danger signs: **poor feeding** and **lethargy (very sleepy)**, along with respiratory symptoms (wheezing) - In young infants, any danger sign (poor feeding, lethargic/unconscious, convulsions, severe chest indrawing, central cyanosis) requires immediate classification as "Very severe disease" and **urgent referral** to higher center - This is a specific diagnostic classification used in pediatric emergency protocols, not a general term *Severe respiratory infection* - While the child has respiratory symptoms (wheezing), this classification would only be appropriate if respiratory distress was present **without danger signs** - The presence of danger signs (poor feeding, lethargy) escalates the classification to "Very severe disease" in the WHO/IMNCI protocol - In young infants (0-2 months), the classification system prioritizes danger signs over organ-specific diagnoses *No evidence of pneumonia* - This is incorrect as the infant clearly presents with respiratory symptoms (wheezing) and systemic signs of illness - The presence of wheezing, poor feeding, and lethargy indicates serious illness requiring urgent evaluation and treatment - This option contradicts the clinical presentation *No diagnosis* - This is incorrect as the WHO/IMNCI classification provides a clear diagnostic framework - The presence of danger signs in a young infant mandates classification as "Very severe disease" - A working diagnosis is essential for guiding appropriate management and urgent referral
Question 683: A 3-month-old infant with no chest indrawing and a respiratory rate of 52/minute. The diagnosis is:
- A. Severe pneumonia
- B. Pneumonia (Correct Answer)
- C. No pneumonia
- D. Very severe disease
Explanation: ***Pneumonia*** - A respiratory rate of 52/minute in a 3-month-old infant **meets the age-specific threshold for tachypnea** (respiratory rate ≥ 50 breaths/minute for infants 2-12 months according to IMCI guidelines). - In the **absence of chest indrawing**, the presence of fast breathing (tachypnea) alone classifies this as **pneumonia** per IMCI classification. - This requires **outpatient management with oral antibiotics** and close follow-up. *No pneumonia* - This diagnosis would apply if the respiratory rate was **< 50 breaths/minute** for this age group with no chest indrawing. - Since the respiratory rate is 52/minute (≥ 50/minute), this rules out "no pneumonia." *Severe pneumonia* - This diagnosis requires the presence of **chest indrawing** in addition to fast breathing. - The question explicitly states **"no chest indrawing,"** which excludes severe pneumonia. - Severe pneumonia would require **hospitalization and parenteral antibiotics**. *Very severe disease* - This diagnosis involves **danger signs** such as inability to drink or breastfeed, persistent vomiting, convulsions, lethargy, unconsciousness, or severe malnutrition. - None of these critical signs are mentioned in the clinical scenario. - Very severe disease requires **urgent hospitalization and injectable antibiotics**.
Pharmacology
2 questionsWhich vaccine is associated with a risk of encephalopathy?
What is the appropriate diluent for the BCG vaccine?
NEET-PG 2013 - Pharmacology NEET-PG Practice Questions and MCQs
Question 681: Which vaccine is associated with a risk of encephalopathy?
- A. OPV
- B. Rubella
- C. Measles (Correct Answer)
- D. BCG
Explanation: ***Measles*** - Among the options provided, **measles vaccine** has been reported to have a very rare association with **post-vaccination encephalitis/encephalopathy** (approximately 1 per million doses). - **Important note:** The **pertussis vaccine (particularly whole-cell DTP)** is the vaccine most classically associated with encephalopathy risk, but it is not among the options here. - The risk of encephalopathy from the measles vaccine is significantly lower than the risk from natural measles infection itself. - Modern measles vaccines are highly purified and safer than earlier formulations. *OPV* - **Oral Polio Vaccine (OPV)** is associated with **vaccine-associated paralytic poliomyelitis (VAPP)**, not encephalopathy. - VAPP occurs at a rate of approximately 1 case per 2.4 million doses due to reversion of the attenuated virus to a neurovirulent form. - Manifests as flaccid paralysis, not encephalopathy. *Rubella* - **Rubella vaccine** (component of MMR) is very safe with no significant association with encephalopathy. - Rare adverse effects include transient arthralgia (especially in adult women), mild rash, or lymphadenopathy. - Severe neurological complications are extremely rare. *BCG* - **Bacillus Calmette-Guérin (BCG) vaccine** protects against tuberculosis and is not associated with encephalopathy. - Common adverse effects are local reactions: induration, ulceration, scarring, and rarely lymphadenitis. - Disseminated BCG infection can occur in immunocompromised individuals but is distinct from encephalopathy.
Question 682: What is the appropriate diluent for the BCG vaccine?
- A. Sterile normal saline
- B. Sterile distilled water (Correct Answer)
- C. Sterile dextrose solution
- D. Colloid solutions
Explanation: ***Sterile distilled water*** - **Sterile distilled water** is the recommended diluent for the **BCG vaccine** to ensure proper reconstitution and antigen stability. - Using the correct diluent is critical for maintaining the **efficacy** and safety of the vaccine. *Sterile normal saline* - **Sterile normal saline** (0.9% NaCl) can be used as a diluent for some vaccines, but it is **not appropriate for BCG** as it can negatively impact vaccine viability. - The **salt concentration** in saline can affect the live attenuated organisms in the BCG vaccine. *Sterile dextrose solution* - **Dextrose solutions** are generally avoided as vaccine diluents due to their potential to support **bacterial growth** or alter vaccine stability. - They are primarily used for **intravenous fluid administration** and not for vaccine reconstitution. *Colloid solutions* - **Colloid solutions** like albumin or dextran are never used as vaccine diluents as they can interfere with the **vaccine antigens** and cause adverse reactions. - These solutions are typically used for **plasma volume expansion** and have no role in vaccine preparation.