Community Medicine
3 questionsIndia started 2-dose vaccination strategy for measles, in -
Which 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?
NEET-PG 2013 - Community Medicine NEET-PG Practice Questions and MCQs
Question 611: India started 2-dose vaccination strategy for measles, in -
- A. 2008
- B. 2009
- C. 2010 (Correct Answer)
- D. 2011
Explanation: ***2010*** - India implemented the **two-dose measles vaccination strategy** as part of its Universal Immunization Program starting in **2010**. - This decision was based on recommendations to improve immunity and reduce measles incidence, moving from a single-dose to a more effective **two-dose schedule**. *2008* - While important immunization initiatives were ongoing, the specific policy of a **two-dose measles vaccination strategy** had not yet been introduced in India during 2008. - At this time, the focus was primarily on ensuring high coverage of the **first dose** of measles vaccine. *2009* - The year 2009 saw continued efforts to strengthen the Universal Immunization Program, but the official launch of the **two-dose measles vaccination strategy** in India occurred later. - Discussions and planning for the transition were likely underway, but implementation began in the subsequent year. *2011* - By 2011, the **two-dose measles vaccination strategy** was already being implemented across India, having been introduced in 2010. - This year marked a period of expanding coverage and consolidation of the new 2-dose schedule rather than its initial introduction.
Question 612: 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 613: 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
Microbiology
2 questionsIn blood culture the ratio of blood to reagent is?
Which of the following is an intermediate level disinfectant?
NEET-PG 2013 - Microbiology NEET-PG Practice Questions and MCQs
Question 611: In blood culture the ratio of blood to reagent is?
- A. 1:5
- B. 1:20
- C. 1:10 (Correct Answer)
- D. 1:100
Explanation: ***1:10*** - A 1:10 ratio of **blood to reagent (culture media)** is recommended for optimal growth of microorganisms in blood cultures. - This dilution minimizes the inhibitory effect of **human antimicrobial factors** present in the blood, while still providing sufficient blood volume for pathogen detection. *1:5* - A 1:5 ratio would mean a relatively **higher concentration of blood** in the culture. - This higher concentration could lead to increased inhibition of bacterial growth by **host defense mechanisms** or **antibiotics** present in the patient's blood, potentially causing false-negative results. *1:20* - A 1:20 ratio implies a **lower concentration of blood** relative to the culture media. - While it further dilutes inhibitory factors, it also reduces the total number of microorganisms sampled, possibly leading to **false-negative results** if the bacterial load is low. *1:100* - A 1:100 ratio would result in an **extremely low concentration of blood** in the culture. - This significantly reduces the likelihood of detecting microorganisms, especially when the **bacteremia is sparse**, due to insufficient bacterial inoculum, leading to a high rate of false negatives.
Question 612: Which of the following is an intermediate level disinfectant?
- A. Ethylene oxide
- B. Hypochlorite (Correct Answer)
- C. 2% glutaraldehyde
- D. None of the options
Explanation: ***Hypochlorite*** - **Hypochlorite** (e.g., sodium hypochlorite, bleach) is an effective **intermediate-level disinfectant** commonly used for surface disinfection and water purification. - It works by **oxidizing cellular components** and disrupting membrane function in microorganisms, effective against a wide range of bacteria, viruses, and some fungi. *2% glutaraldehyde* - **2% glutaraldehyde** is a **high-level disinfectant** and **sterilant** often used for heat-sensitive medical equipment like endoscopes. - It is effective against bacterial spores, mycobacteria, fungi, and viruses, which exceeds the scope of intermediate-level disinfection. *Ethylene oxide* - **Ethylene oxide** is a **gaseous sterilant** used for heat-sensitive and moisture-sensitive medical devices, making it a high-level modality. - It works by **alkylating proteins and nucleic acids**, effectively killing all forms of microbial life, including spores. *None of the options* - This option is incorrect because **Hypochlorite** is indeed an intermediate-level disinfectant. - The classification of disinfectants is based on their ability to kill different types of microorganisms, with hypochlorite falling squarely into the intermediate category.
Obstetrics and Gynecology
1 questionsWhich vaccine is contraindicated in pregnancy?
NEET-PG 2013 - Obstetrics and Gynecology NEET-PG Practice Questions and MCQs
Question 611: Which vaccine is contraindicated in pregnancy?
- A. Cholera vaccine
- B. Typhoid vaccine
- C. Meningococcal vaccine
- D. Measles vaccine (Correct Answer)
Explanation: ***Measles vaccine*** - The measles vaccine is a **live attenuated vaccine**, which carries a theoretical risk of causing infection in the fetus. - Live vaccines are generally **contraindicated during pregnancy** due to this potential risk of congenital infection. *Cholera vaccine* - The cholera vaccine is generally considered **safe during pregnancy** if indicated, especially for travel to endemic areas. - While administration in pregnancy should be based on risk-benefit, it is not consistently contraindicated like live vaccines. *Typhoid vaccine* - Both inactivated and live attenuated typhoid vaccines are available; the **inactivated (killed) vaccine** is generally preferred if vaccination is necessary during pregnancy. - The risks of the disease usually outweigh the vaccine risks, and it is not a universal contraindication. *Meningococcal vaccine* - **Meningococcal vaccines** are generally considered safe and can be administered during pregnancy if there is a significant risk of exposure or during outbreaks. - The benefits of maternal and potential fetal protection from meningococcal disease outweigh theoretical risks.
Pediatrics
2 questionsIdeal temperature for DPT storage?
Which immunization is typically given at 6 months of age?
NEET-PG 2013 - Pediatrics NEET-PG Practice Questions and MCQs
Question 611: Ideal temperature for DPT storage?
- A. Room temperature
- B. 4 to 8°C (Correct Answer)
- C. 0 to - 20°C
- D. None of the options
Explanation: ***4 to 8°C*** - The ideal temperature for DPT (diphtheria, pertussis, tetanus) vaccine storage is between **+2°C and +8°C** (or 35°F and 46°F), which is the standard refrigerator temperature range. - This temperature range is crucial for maintaining the **potency** and **efficacy** of the vaccine, preventing **degradation** due to excessive heat or cold. *Room temperature* - Storing DPT vaccines at **room temperature** (typically 20-25°C or 68-77°F) for extended periods can lead to a **loss of potency** as heat can degrade vaccine components. - While short-term excursions within this range might be permissible under specific conditions (e.g., during transport), it is not the ideal long-term storage solution. *0 to - 20°C* - DPT vaccines, particularly the **whole-cell pertussis (wP)** component, can be **damaged by freezing**. - Temperatures below 0°C can cause the **adjuvant** (usually aluminum salt) to separate, leading to a loss of efficacy and potential local reactions at the injection site. *None of the options* - This option is incorrect because **4 to 8°C** is indeed the established and recommended ideal storage temperature for DPT vaccines.
Question 612: 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.
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 611: 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 612: 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.