Infectious Diseases Practice Questions

Q: Consider the following statements: Prophylactic disinfection includes 1. disinfection of urine specimen of patient with enteric fever 2. pasteurization of milk 3. disinfection of contaminated linen 4. disinfection of water by chlorine Which of these statements are correct?

2 and 4 only. ***Correct: 2 and 4 only*** - **Prophylactic (preventive) disinfection** is performed on materials that are *potentially* contaminated to prevent disease transmission BEFORE actual contamination occurs - **Pasteurization of milk** and **chlorination of water** are classic examples of prophylactic measures applied to substances before consumption - These are routine public health interventions performed regardless of known contamination *Incorrect: 1 and 3 only* - This incorrectly classifies **disinfection of urine specimens from enteric fever patients** and **disinfection of contaminated linen** as prophylactic measures - Both are examples of **concurrent/terminal disinfection** (performed on materials already known to be contaminated from infected patients) - Misses pasteurization and chlorination which are true prophylactic measures *Incorrect: 1, 2, 3 and 4* - While statements 2 and 4 are correct examples of prophylactic disinfection, statements 1 and 3 are NOT - **Statement 1** (disinfection of urine from enteric fever patient) is **concurrent disinfection** - the patient is already infected, and we're disinfecting their excreta - **Statement 3** (disinfection of contaminated linen) is **concurrent/terminal disinfection** - the linen is already contaminated - Prophylactic measures are preventive; concurrent/terminal measures deal with known contamination *Incorrect: 1, 2 and 4 only* - Incorrectly includes statement 1 (disinfection of urine from infected patient) which is concurrent disinfection, not prophylactic - Also incorrectly excludes statement 3 while the issue is that both 1 and 3 are not prophylactic measures

Q: Consider the following diseases: 1. Rift valley fever 2. Yellow Fever 3. Chikungunya fever 4. West Nile fever Which of the above diseases are transmitted by Aedes mosquito?

1, 2 and 3. ***1, 2 and 3*** - **Rift Valley fever**, **Yellow fever**, and **Chikungunya fever** are all primarily transmitted to humans through the bites of infected **Aedes mosquitoes**. - The **Aedes aegypti** and **Aedes albopictus** species are particularly significant vectors for these viral diseases. *1, 2 and 4* - This option incorrectly includes **West Nile fever** while omitting **Chikungunya fever**. - **West Nile fever** is primarily transmitted by **Culex mosquitoes**, not Aedes mosquitoes. *2, 3 and 4* - This option incorrectly includes **West Nile fever** as an Aedes mosquito-borne disease. - **Yellow fever** and **Chikungunya fever** are indeed transmitted by Aedes mosquitoes, but **West Nile fever** is not. *1, 3 and 4* - This option incorrectly includes **West Nile fever** in the list of Aedes-borne diseases. - While **Rift Valley fever** and **Chikungunya fever** are transmitted by Aedes mosquitoes, **West Nile fever** is primarily transmitted by Culex species.

Q: The most common site for nosocomial (hospital acquired) infection is:

Urinary tract. ***Urinary tract*** - **Urinary tract infections (UTIs)** are the most frequently acquired nosocomial infections, often associated with **urinary catheterization**. - Catheter-associated UTIs (CAUTIs) account for a significant percentage of all healthcare-associated infections. *Surgical site* - **Surgical site infections (SSIs)** are a common type of nosocomial infection, but they are less frequent than UTIs overall. - SSIs are highly dependent on the type of surgery, duration, and patient risk factors. *Blood stream* - **Bloodstream infections (BSIs)**, including central line-associated bloodstream infections (CLABSIs), are serious nosocomial infections. - While they carry high morbidity and mortality, their overall incidence is lower than that of UTIs. *Respiratory tract* - **Respiratory tract infections**, particularly **ventilator-associated pneumonia (VAP)**, are significant nosocomial concerns. - However, they are not as common as UTIs when considering all types of healthcare settings and patient populations.

Q: In the context of "Anti-Malaria Month Campaign", consider the following statements: 1. It is observed every year in the month of June 2. It is planned during the Monsoon season 3. It aims to enhance the level of community awareness and participation Select the correct answer using the code given below:

1 and 3. ***1 and 3*** - The **Anti-Malaria Month Campaign** is observed annually in **June** to raise awareness and implement preventive measures ahead of peak malaria transmission during the monsoon season. - A primary objective is to **enhance community awareness and participation** in malaria control efforts through activities like vector control (larvicidal measures, source reduction), early case detection, and prompt treatment. - Statement 2 is incorrect because the campaign is **planned and launched in June**, which coincides with the **onset** of monsoon, but the planning phase occurs **before** the monsoon rains intensify. The phrase "planned during monsoon" incorrectly suggests the planning happens during the monsoon period, whereas planning occurs in the pre-monsoon period (April-May) for implementation starting in June. *1 and 2* - While statement 1 is correct (observed in June) and statement 3 would be correct (enhancing participation), statement 2 creates confusion about timing. - The campaign **planning occurs before the monsoon season** (April-May), and **implementation begins in June** as monsoon arrives. Saying it is "planned during monsoon" is technically inaccurate. *2 and 3* - Statement 2 is incorrect as explained above - the campaign planning precedes the monsoon season. - While statement 3 about enhancing community participation is correct, this combination is wrong due to statement 2. *3 only* - This misses statement 1, which is clearly correct - the Anti-Malaria Month Campaign has been traditionally observed in **June** every year as part of the National Vector Borne Disease Control Programme (NVBDCP). - Both statements 1 and 3 are correct, making this option incomplete.

Q: Which of the following diseases are spread by airborne transmission? 1. Influenza 2. Chicken pox 3. Q-fever 4. Psittacosis Select the correct answer using the code given below:

3 and 4 only. ***3 and 4 only*** - **Q-fever (Coxiella burnetii)** and **Psittacosis (Chlamydia psittaci)** are true **airborne diseases** that spread via droplet nuclei or dust particles <5 μm that remain suspended in air and can travel long distances. - **Q-fever** spreads through inhalation of contaminated aerosols from infected animal products (particularly during parturition in livestock). - **Psittacosis** spreads via inhalation of aerosolized dried bird droppings or respiratory secretions from infected birds. - **Airborne transmission** requires particles small enough to remain suspended in air for extended periods and travel beyond 1-2 meters. *1, 2, 3 and 4* - This option is incorrect because **Influenza** is classified as a **droplet-borne disease**, not airborne. - **Influenza** spreads primarily through large respiratory droplets (>5 μm) that travel <1 meter and settle quickly, requiring close contact for transmission. - **Chickenpox**, while highly contagious, has both airborne and direct contact routes, but the primary emphasis in this question context should be on strict airborne diseases (Q-fever and Psittacosis). - The distinction between droplet and airborne transmission is critical for infection control measures (surgical masks vs N95 respirators). *1 and 3 only* - This option is incorrect as **Influenza** is not an airborne disease but rather spreads via droplet transmission. - While **Q-fever** is correctly identified as airborne, including Influenza makes this combination incorrect. - **Psittacosis** is also airborne and should be included. *1 and 4 only* - This option is incorrect because **Influenza** does not meet the criteria for airborne transmission. - While **Psittacosis** is correctly identified, the inclusion of Influenza and exclusion of Q-fever makes this choice inaccurate. - Both Q-fever and Psittacosis are classic examples of airborne zoonotic infections.

Q: Consider the following criteria which may indicate elimination of lymphatic filariasis in a community: 1. When lymphatic filariasis ceases to be a public health problem in the community 2. When the number of microfilaria carriers declines to 1.5 % within the community 3. When children born in the community after the initiation of elimination programme are free from circulating antigenaemia Which of the criteria stated above hold true?

1, 2 and 3. ***1, 2 and 3*** - All three criteria reflect the **WHO framework for elimination of lymphatic filariasis** as a public health problem. - **Criterion 1**: Represents the overarching goal that the disease burden and transmission have been reduced such that it no longer poses a significant public health threat in the community. - **Criterion 2**: A **microfilaria carrier rate < 1-1.5%** indicates substantial reduction in active infection and transmission potential in the population. - **Criterion 3**: **Transmission Assessment Survey (TAS)** criteria include demonstrating that children born after program initiation are free from circulating filarial antigen (< 2% antigen prevalence in 6-7 year age group), confirming **interruption of transmission**. - Together, these criteria provide epidemiological, clinical, and transmission-based evidence of elimination. *1 and 3 only* - This option incorrectly excludes the **decline in microfilaria carrier prevalence** as a criterion. - Reduction in **microfilaremia prevalence** is a critical epidemiological indicator showing decreased infection reservoir and reduced transmission potential in the community. *1 and 2 only* - This option incorrectly excludes the criterion related to **children being free from circulating antigenaemia**. - The **TAS (Transmission Assessment Survey)** uses antigen testing in children as the primary tool to verify interruption of transmission, making this criterion essential for confirming elimination. *2 and 3 only* - This option excludes the overarching criterion that **lymphatic filariasis ceases to be a public health problem**. - While specific measurable criteria (2 and 3) are important, the overall assessment that the disease no longer constitutes a public health problem remains a fundamental elimination indicator.

Q: Which one of the following is NOT a contagious disease?

Malaria. ***Malaria*** - Malaria is caused by **Plasmodium parasites** transmitted through the bite of infected Anopheles mosquitoes. It is not spread directly from person to person. - Transmission requires a **vector** (mosquito), making it a non-contagious infectious disease. *Trachoma* - Trachoma is a contagious bacterial infection caused by **Chlamydia trachomatis**, spread through direct contact with eye and nose discharge of an infected person. - It can also be transmitted via **fomites** like contaminated towels or clothing, or through eye-seeking flies. *Leprosy* - Leprosy, caused by **Mycobacterium leprae**, is a chronic infectious disease that is considered contagious, although with low infectivity. - It is primarily transmitted through **nasal droplets** during close and prolonged contact with an untreated infected person. *Scabies* - Scabies is a contagious skin infestation caused by the **mite Sarcoptes scabiei**, which burrows into the outer layer of the skin. - It is easily spread through **direct, prolonged skin-to-skin contact** with an infected person.

Q: A 22-year-old woman presents for STI screening. She reports multiple sexual partners and inconsistent condom use. What screening tests would be most appropriate?

HIV, syphilis, gonorrhea, and chlamydia testing. ***HIV, syphilis, gonorrhea, and chlamydia testing*** - This comprehensive panel screens for the most common bacterial and viral STIs in sexually active individuals with **multiple partners** and **inconsistent condom use**, as recommended by **NACO and WHO guidelines**. - **Gonorrhea and chlamydia** often present asymptomatically but can lead to serious reproductive health complications including pelvic inflammatory disease (PID) and infertility if untreated. - In high-risk populations, comprehensive screening is essential for early detection and prevention of transmission. *HPV DNA testing only* - **HPV DNA testing** is primarily for cervical cancer screening in women over 30 years or as a co-test with cytology; it doesn't cover other STIs. - While HPV is common, testing for other prevalent STIs like chlamydia, gonorrhea, syphilis, and HIV is crucial given her risk factors. *Complete blood count and urinalysis* - A **complete blood count (CBC)** assesses overall health and detects conditions like anemia or infection but is not a specific STI screening test. - **Urinalysis** checks for urinary tract infections or kidney issues and does not directly screen for STIs. - These are general screening tests and miss the targeted STI screening needed. *HIV and syphilis testing only* - Although **HIV and syphilis testing** are essential components of STI screening, this option misses other common and treatable bacterial STIs like gonorrhea and chlamydia. - Given the patient's risk factors (multiple partners, inconsistent condom use), a more comprehensive screening panel is warranted to prevent long-term reproductive complications.

Q: A 25-year-old woman is diagnosed with chlamydial cervicitis. Her partner refuses evaluation and treatment. What is the most appropriate approach to partner management?

Expedited partner therapy. ***Expedited partner therapy*** - **Expedited Partner Therapy (EPT)** is the evidence-based, internationally recommended approach for partner management when partners refuse evaluation and treatment for **chlamydia** and **gonorrhea**. - EPT involves providing **antibiotic medication** directly to the partner without clinical examination, ensuring immediate treatment and preventing **reinfection** of the index patient and reducing community transmission. *Provider referral through health department* - While **contact tracing** through health departments is valuable for STI control, it may be **time-consuming** and less effective when partners actively refuse treatment. - This approach relies on **persuasion** rather than direct treatment provision, potentially allowing continued transmission during the delay period. *Counsel patient on condom use only* - **Condom counseling** alone does not address the **current chlamydial infection** in the partner, leaving them untreated. - The infected partner can **reinfect** the patient even with condom use due to potential inconsistent usage or condom failure. *Withhold treatment until partner presents* - Withholding treatment is **medically inappropriate** and can lead to serious complications including **pelvic inflammatory disease (PID)**, chronic pelvic pain, and **infertility**. - The index patient requires **immediate antibiotic treatment** regardless of partner cooperation, as delaying treatment puts the patient at risk for ascending infection.

Question 1

Consider the following statements: Prophylactic disinfection includes

1. disinfection of urine specimen of patient with enteric fever 
2. pasteurization of milk 
3. disinfection of contaminated linen 
4. disinfection of water by chlorine Which of these statements are correct?

Accepted Answer

2 and 4 only

Answer

1 and 3 only

Answer

1, 2, 3 and 4

Answer

1, 2 and 4 only

Question 2

Consider the following diseases:

1. Rift valley fever

2. Yellow Fever

3. Chikungunya fever

4. West Nile fever

Which of the above diseases are transmitted by Aedes mosquito?

Accepted Answer

1, 2 and 3

Answer

1, 2 and 4

Answer

2, 3 and 4

Answer

1, 3 and 4

Question 3

The most common site for nosocomial (hospital acquired) infection is:

Accepted Answer

Urinary tract

Answer

Surgical site

Answer

Blood stream

Answer

Respiratory tract

Question 4

In the context of "Anti-Malaria Month Campaign", consider the following statements:

1. It is observed every year in the month of June

2. It is planned during the Monsoon season

3. It aims to enhance the level of community awareness and participation

Select the correct answer using the code given below:

Accepted Answer

1 and 3

Answer

1 and 2

Answer

2 and 3

Answer

3 only

Question 5

Which of the following diseases are spread by airborne transmission?

1. Influenza
2. Chicken pox
3. Q-fever
4. Psittacosis

Select the correct answer using the code given below:

Accepted Answer

3 and 4 only

Answer

1 and 3 only

Answer

1 and 4 only

Answer

1, 2, 3 and 4

Question 6

Consider the following criteria which may indicate elimination of lymphatic filariasis in a community:

1. When lymphatic filariasis ceases to be a public health problem in the community

2. When the number of microfilaria carriers declines to 1.5 % within the community

3. When children born in the community after the initiation of elimination programme are free from circulating antigenaemia Which of the criteria stated above hold true?

Accepted Answer

1, 2 and 3

Answer

1 and 3 only

Answer

1 and 2 only

Answer

2 and 3 only

Question 7

Which one of the following is NOT a contagious disease?

Accepted Answer

Malaria

Answer

Trachoma

Answer

Leprosy

Answer

Scabies

Question 8

Which of the following statements about screening for chlamydia and gonorrhea is MOST accurate?

Accepted Answer

Screening is recommended for sexually active women under 25, men who have sex with men, and pregnant women

Answer

Screening is not cost-effective and should be avoided in low-risk populations

Answer

Screening is only recommended for patients with symptoms

Answer

Annual screening is recommended for all sexually active adults regardless of age or risk factors

Question 9

A 22-year-old woman presents for STI screening. She reports multiple sexual partners and inconsistent condom use. What screening tests would be most appropriate?

Accepted Answer

HIV, syphilis, gonorrhea, and chlamydia testing

Answer

HPV DNA testing only

Answer

Complete blood count and urinalysis

Answer

HIV and syphilis testing only

Question 10

A 25-year-old woman is diagnosed with chlamydial cervicitis. Her partner refuses evaluation and treatment. What is the most appropriate approach to partner management?

Accepted Answer

Expedited partner therapy

Answer

Counsel patient on condom use only

Answer

Withhold treatment until partner presents

Answer

Provider referral through health department

Infectious Diseases — MCQs

Infectious Diseases — MCQs

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