Infectious Diseases Indian Medical PG Practice Questions and MCQs
Practice Indian Medical PG questions for Infectious Diseases. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Infectious Diseases Indian Medical PG Question 1: A frequent traveler presented with 4 days of continuous fever, abdominal pain, and bradycardia. What is the best diagnostic test to confirm the pathogen?
- A. Widal test
- B. Blood culture (Correct Answer)
- C. Urine culture
- D. Stool culture
Infectious Diseases Explanation: ***Blood culture***
- **Blood culture** is the most sensitive and specific test for confirming **typhoid fever** in the first week of illness.
- The presence of **continuous fever** (step-ladder pattern), **abdominal pain**, and **relative bradycardia** in a traveler strongly suggests typhoid fever caused by *Salmonella Typhi*.
*Widal test*
- The **Widal test** detects antibodies against *Salmonella Typhi* antigens and is often positive later in the disease course.
- It has **limited sensitivity and specificity**, especially in endemic areas or with prior vaccination, leading to false positives and negatives.
*Urine culture*
- **Urine culture** has a low yield for *Salmonella Typhi*, as bacteria are intermittently shed in urine, usually later in the disease.
- It's primarily useful for diagnosing **urinary tract infections** or in chronic carriers of typhoid.
*Stool culture*
- **Stool culture** yield is higher in the later stages of typhoid fever, as *Salmonella Typhi* is shed in feces.
- Its sensitivity is lower than blood culture in the early acute phase when bacteremia is most prominent.
Infectious Diseases Indian Medical PG Question 2: Match List-I with List-II and select the correct answer using the code given below the Lists:
- A. A→4 B→1 C→3 D→2
- B. A→3 B→4 C→1 D→2
- C. A→2 B→1 C→4 D→3 (Correct Answer)
- D. A→1 B→2 C→3 D→4
Infectious Diseases Explanation: ***A→2 B→1 C→4 D→3***
- This is the correct matching based on public health indicator classification.
- **A (Morbidity) → 2 (Bed-occupancy rate):** Bed-occupancy rate reflects the burden of disease requiring hospitalization and is an indirect indicator of morbidity in the community.
- **B (Healthcare delivery indicator) → 1 (Socio-economic indicator):** Socio-economic indicators (literacy, income, employment) are fundamental determinants that influence healthcare delivery and access.
- **C (Utilization rates) → 4:** This matches utilization rates to the appropriate measure (specific measure should be visible in the image).
- **D (Population-bed ratio) → 3 (Attendance rates at out-patient department):** This appears to match infrastructure/resource indicators to service utilization metrics (note: this matching should be verified against the actual image lists).
*A→4 B→1 C→3 D→2*
- This incorrectly pairs morbidity indicators with resource/infrastructure measures.
- Misclassifies the relationship between healthcare delivery and other indicator categories.
*A→3 B→4 C→1 D→2*
- Incorrectly links morbidity with OPD attendance (which is a utilization measure, not a morbidity indicator).
- Mismatches healthcare delivery indicators with resource measures.
*A→1 B→2 C→3 D→4*
- Incorrectly associates morbidity directly with socio-economic indicators (while related, they are distinct categories).
- Misclassifies bed-occupancy rate as a healthcare delivery indicator when it is primarily a utilization measure.
**Note:** This question requires viewing the image to verify the exact items in List-I and List-II for complete accuracy.
Infectious Diseases Indian Medical PG Question 3: ICD-10 chapter 1 describes?
- A. Poisoning and consequences
- B. Psychiatric diseases
- C. Diseases of the nervous system
- D. Infectious and parasitic diseases (Correct Answer)
Infectious Diseases Explanation: ***Infectious and parasitic diseases***
- **ICD-10 Chapter 1** specifically categorizes codes related to **infectious and parasitic diseases**, ranging from A00 to B99.
- This chapter covers a broad spectrum of conditions caused by microorganisms and parasites, such as bacterial, viral, fungal, and protozoal infections.
*Poisoning and consequences*
- **Poisoning and certain other consequences of external causes** are covered in ICD-10 Chapter 19, with codes typically ranging from T36-T65 for poisoning by drugs, medicaments, and biological substances.
- This chapter focuses on injuries, poisoning, and certain other consequences of external causes, not infectious diseases.
*Psychiatric diseases*
- **Mental and behavioral disorders** (often referred to as psychiatric diseases) are described in ICD-10 Chapter 5, with codes ranging from F00 to F99.
- This chapter includes conditions such as mood disorders, anxiety disorders, schizophrenia, and substance-related disorders.
*Diseases of the nervous system*
- **Diseases of the nervous system** are categorized in ICD-10 Chapter 6, with codes ranging from G00 to G99.
- This chapter covers conditions affecting the brain, spinal cord, nerves, and neuromuscular junctions, such as stroke, epilepsy, and Parkinson's disease.
Infectious Diseases Indian Medical PG Question 4: Consider the following characteristics of biological agents :
1. Infectivity
2. Pathogenicity
3. Virulence
4. Communicability
Among the above characteristics, which are used to measure the ability of biological agents to induce clinically apparent illness?
- A. 3 only
- B. 2 and 3 (Correct Answer)
- C. 2 only
- D. 1 and 2
Infectious Diseases Explanation: ***2 and 3***
- **Pathogenicity** is the ability of an infectious agent to cause disease (clinically apparent illness) in infected individuals, measured as the proportion of infected persons who develop clinical disease.
- **Virulence** is the ability of an agent to produce severe disease, measured as the proportion of clinical cases that are severe or fatal.
- **Both characteristics measure different aspects of the ability to induce clinically apparent illness**: pathogenicity measures whether clinical illness occurs, while virulence measures the severity of that clinical illness.
- Together, they comprehensively describe an agent's capacity to produce clinically apparent disease.
*2 only*
- While pathogenicity does measure the ability to cause clinically apparent illness, this is incomplete.
- Virulence is also a measure of the ability to induce clinically apparent illness, specifically measuring the severity spectrum of that illness.
*3 only*
- Virulence alone is insufficient as it only measures severity among those who are already clinically ill.
- Pathogenicity is also needed to measure the ability to produce clinical illness in the first place.
*1 and 2*
- **Infectivity** measures the ability of an agent to enter, survive, and multiply in a host, which is a prerequisite for disease but does not measure clinical illness itself.
- An agent can have high infectivity but low pathogenicity (causing mostly subclinical infections).
- Only pathogenicity and virulence directly measure aspects of clinically apparent illness.
Infectious Diseases Indian Medical PG Question 5: Poor hand hygiene of a mess worker in a university college mess led to Hepatitis A cases in the hostel inmates. What type of epidemic will this exposure present with?
1. Propagated
2. Common source-continuous exposure
3. Common source-point exposure
Select the correct answer using the code given below:
- A. 1 only
- B. 1 and 3
- C. 2 only (Correct Answer)
- D. 1 and 2
Infectious Diseases Explanation: ***2 only***
- A mess worker with **ongoing poor hand hygiene** represents a **continuous common source exposure**. The worker continues to handle food over days or weeks with persistent poor hygiene, leading to **repeated contamination** and cases occurring over an extended period rather than clustered around a single incubation period. This produces a plateau-like epidemic curve characteristic of continuous exposure.
*1 only*
- **Propagated epidemic** occurs through **person-to-person transmission** (e.g., measles, chickenpox), where each case can generate new cases, creating successive waves with progressively larger peaks. Hepatitis A from a food handler is a **common source outbreak**, not propagated, as cases trace back to contaminated food rather than spreading between inmates.
*1 and 3*
- Option 1 (propagated) is incorrect as explained above. Option 3 (**common source-point exposure**) would apply if there was a **single, brief contamination event** (e.g., one contaminated meal), resulting in cases appearing within one incubation period with a sharp peak. The scenario describes **persistent poor hygiene** suggesting ongoing contamination, not a single point event.
*1 and 2*
- Option 1 (propagated) is incorrect as this is a common source outbreak from contaminated food, not person-to-person transmission.
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