NEET-PG 2013 Practice Questions

Q: The BEINGS Model of disease causation does not include which of the following factors?

Spiritual factors. ***Spiritual factors*** - The **BEINGS model** does not include \"Spiritual factors\" as one of its components. - The BEINGS acronym stands for: **B**iological, **E**nvironmental, **I**mmunological, **N**utritional, **G**enetic, and **S**ocial factors. - While spirituality can influence health outcomes, it is not a formal component of this epidemiological model. *Religious factors* - Religious factors, like spiritual factors, are also not explicitly part of the BEINGS model. - However, religious practices and beliefs may be considered as part of **social factors** (the \"S\" in BEINGS) in some contexts. - This option is less clearly excluded than spiritual factors. *Social factors* - The \"**S**\" in BEINGS specifically stands for **Social factors**, not spiritual factors. - Social factors include community networks, socioeconomic status, cultural practices, and social support systems. - These are well-established determinants of health and disease causation. *Nutritional factors* - The \"**N**\" in BEINGS stands for **Nutritional factors**. - Nutrition plays a critical role in disease causation, affecting immunity, growth, and susceptibility to various diseases. - Deficiencies or excesses in nutrition can lead to a wide range of health problems.

Q: Which of the following is/are fundamental principles of epidemiology?

Distribution, Determinants, and Deterrents. ***Distribution, Determinants, and Deterrents*** - Epidemiology is based on three core principles: **Distribution** (who, when, where), **Determinants** (causes and risk factors), and **Deterrents** (control and prevention measures) - These represent the **complete framework** for epidemiological investigation and public health action - This triad encompasses disease occurrence patterns, causal analysis, and intervention strategies *Distribution only* - While **distribution** (person, place, time) is essential for describing disease patterns, it alone is insufficient - Without understanding determinants and implementing deterrents, epidemiology would be purely descriptive with no causal inference or prevention capability *Determinants only* - **Determinants** (risk factors and causes) are crucial but incomplete without distribution patterns and prevention strategies - Identifying causes without understanding distribution or implementing control measures limits public health impact *Deterrents only* - **Deterrents** (prevention and control) cannot be effectively applied without understanding disease distribution and determinants - Intervention without epidemiological foundation would be unfocused and inefficient

Q: Retraction of tympanic membrane touching the promontory. What is the classification according to Sade's grading system?

Grade 3. ***Grade 3*** - **Grade 3** retraction involves the tympanic membrane making contact with the **promontory** of the middle ear. - This contact indicates significant retraction, often with loss of definition of the malleus handle. *Grade 1* - **Grade 1** retraction is characterized by mild retraction with an **intact cone of light** and good mobility. - The tympanic membrane does not touch any middle ear structures. *Grade 2* - **Grade 2** retraction shows the tympanic membrane touching the **incudostapedial joint** or posterior wall of the middle ear. - The handle of the malleus may appear significantly foreshortened. *Grade 4* - **Grade 4** retraction involves **adhesive otitis media**, where the tympanic membrane is severely retracted and fully adherent to the middle ear structures. - This often results in a nearly complete obliteration of the middle ear space.

Q: Which Schistosoma species is primarily associated with eggs being discharged in urine?

S. haematobium. ***S. haematobium*** - *S. haematobium* specifically targets the **urinary bladder plexus**, leading to the discharge of eggs in the **urine**. - Infection with *S. haematobium* is the primary cause of **urinary schistosomiasis** and is associated with complications like **hematuria** and bladder cancer. *S. japonicum (intestinal)* - *S. japonicum* primarily infects the **mesenteric veins of the small intestine** and discharges its eggs in **feces**, not urine. - This species is known for causing severe **intestinal and hepatic schistosomiasis** due to the large number of eggs produced. *S. mansoni (intestinal)* - *S. mansoni* also primarily infects the **mesenteric veins, mainly of the large intestine**, and its eggs are excreted in **feces**. - It is a common cause of **intestinal schistosomiasis**, leading to symptoms such as abdominal pain, diarrhea, and hepatosplenomegaly. *S. mekongi* - *S. mekongi* is another **intestinal schistosome**, closely related to *S. japonicum*, and its eggs are discharged in **feces**. - This species is found in specific regions of Southeast Asia and causes similar symptoms to other intestinal schistosomes.

Q: Most common site for hydatid cyst

Liver. ***Liver*** - The **liver** is the most common site for hydatid cysts, accounting for approximately **60-70%** of cases [1]. - It often leads to **biliary obstruction** and liver dysfunction, highlighting its impact on the organ. *Kidney* - Hydatid cysts in the **kidney** are rare and account for a small percentage of cases (around **2-5%**). - Symptoms are often nonspecific, including **flank pain** or hematuria, which are not primary concerns. *Brain* - While the **brain** can be affected, it is not a common site; CNS involvement occurs in only **1-2%** of hydatid disease cases. - Symptoms are related to increased intracranial pressure or focal neurological deficits, not typical for hydatid cysts. *Lung* - The **lung** is another site for hydatid cysts but accounts for about **10-20%** of cases. - Presentation may include **cough** and chest pain, making it less common compared to liver involvement.

Q: What does the hookworm primarily feed on?

Blood from intestinal mucosa. ***Blood from intestinal mucosa*** - Hookworms attach to the **intestinal wall** and ingest host blood, leading to blood loss and potential **anemia**. - They produce **anticoagulants** to facilitate continuous feeding from the mucosal capillaries. *Plasma proteins* - While plasma contains proteins, hookworms primarily feed directly on **whole blood**, not just isolated plasma proteins. - Feeding mainly on plasma proteins would not explain the significant **iron-deficiency anemia** associated with hookworm infection. *Lymphatic fluid* - Hookworms reside in the **small intestine** and do not typically feed on lymphatic fluid. - Other parasites, like **filarial worms**, are known to inhabit and obstruct the lymphatic system. *Interstitial fluid* - Interstitial fluid is found in the spaces between cells; hookworms feed from the **vascular supply** within the intestinal mucosa. - Feeding on interstitial fluid would not cause the characteristic **blood loss** seen in hookworm infections.

Q: Most common organism causing ventilator associated pneumonia -

Pseudomonas. ***Pseudomonas*** - **Pseudomonas aeruginosa** is one of the most common causes of **ventilator-associated pneumonia (VAP)**, particularly in **late-onset VAP** (≥5 days) and in patients with prolonged mechanical ventilation, prior antibiotic exposure, or underlying lung disease. - Its ability to form **biofilms** and its intrinsic antibiotic resistance contribute to its prevalence in hospital-acquired infections. - Along with **Staphylococcus aureus** (especially MRSA), Pseudomonas is consistently among the leading causes of VAP in ICU settings. *Legionella* - **Legionella** is a less common cause of VAP and is typically associated with contaminated water sources, manifesting as **Legionnaires' disease**. - It usually causes severe, rapidly progressive pneumonia and is often harder to culture than other bacteria. *Pneumococcus* - **Streptococcus pneumoniae (Pneumococcus)** is the most common cause of **community-acquired pneumonia (CAP)**, but it is less frequently implicated in VAP. - While it can cause severe pneumonia and may be seen in **early-onset VAP**, its incidence in late-onset VAP is lower compared to Gram-negative rods like Pseudomonas. *Coagulase negative staphylococcus* - **Coagulase-negative Staphylococci** (e.g., *Staphylococcus epidermidis*) are common **contaminants** in cultures and primarily cause device-related infections, such as those associated with central venous catheters. - They are rarely a primary cause of VAP, as they typically have low virulence in the respiratory tract.

Q: Consumption of uncooked pork is likely to cause which of the following helminthic disease -

Taenia solium. ***Taenia solium*** - Infection with **_Taenia solium_** (pork tapeworm) occurs by consuming raw or undercooked **pork** containing **cysticerci** (larval cysts). - This can lead to **taeniasis** (intestinal tapeworm infection) and, if humans ingest the eggs, **cysticercosis**, a more severe disease involving larval cysts in tissues like the brain. *Taenia saginata* - **_Taenia saginata_** (beef tapeworm) is acquired by eating raw or undercooked **beef** containing larval cysts, not pork. - While it causes gastrointestinal symptoms, it does not typically lead to systemic cysticercosis in humans. *Trichuris trichiura* - **_Trichuris trichiura_** (whipworm) infection is caused by ingesting **embryonated eggs** from contaminated soil, typically associated with poor sanitation. - It is not transmitted through the consumption of undercooked meat. *None of the options* - This option is incorrect because **_Taenia solium_** is definitively associated with the consumption of uncooked pork.

Q: Child having perianal pruritus with the following eggs is due to -

E. vermicularis. ***E. vermicularis*** - **Enterobius vermicularis**, or **pinworm**, is a common cause of **perianal pruritus** in children, particularly at night, due to the female worms migrating to the perianal region to lay eggs. - The characteristic eggs are **oval, flattened on one side**, and are typically identified via the **scotch tape test** around the anus. *Ascaris* - **Ascaris lumbricoides** causes **ascariasis**, which usually presents with **gastrointestinal symptoms** or **pulmonary symptoms** during larval migration, not typically perianal pruritus. - Their eggs are characteristically **mammillated** (roughened outer layer) and typically found in **feces**, not perianal region. *Ancylostoma duodenale* - **Ancylostoma duodenale** causes **hookworm infection**, leading to **iron deficiency anemia** due to blood loss in the intestines. - Hookworm eggs are characteristically **oval, thin-shelled**, and contain a developing **larva**, found in feces. *S. stercoralis* - **Strongyloides stercoralis** causes **strongyloidiasis**, which can present with skin manifestations (larva currens), gastrointestinal issues, or pulmonary symptoms. - It is unique because it causes **auto-infection** and primarily diagnostic stages are **rhabditiform larvae** in stool, not eggs, although eggs are rarely seen in stool.

Q: Which of the following is the only ovoviviparous parasite among the options provided?

Strongyloides. ***Strongyloides*** - *Strongyloides stercoralis* stands out as the only **ovoviviparous** parasite among the options, meaning that its eggs hatch while still inside the uterus of the female worm. - The female worm lays **larvated eggs** that quickly hatch into **rhabditiform larvae** in the intestine or intestinal wall, which are then passed in the feces. *Ascaris* - *Ascaris lumbricoides* is **oviparous**, laying **unembryonated eggs** that are passed in the feces and require a period of maturation in the soil to become infective. - The eggs are robust and can survive for long periods in the environment before they are ingested. *Enterobius* - *Enterobius vermicularis* (pinworm) is also **oviparous**, with the female worm migrating to the perianal region to lay **embryonated eggs** on the skin. - These eggs are immediately infective to humans upon ingestion. *Ancylostome* - Ancylostomes (hookworms) are **oviparous** and lay **thin-shelled eggs** that are passed in the feces and hatch into rhabditiform larvae in the soil. - These larvae then develop into infective **filariform larvae** that penetrate the skin.

Question 1

The BEINGS Model of disease causation does not include which of the following factors?

Accepted Answer

Spiritual factors

Answer

Religious factors

Answer

Social factors

Answer

Nutritional factors

Question 2

Which of the following is/are fundamental principles of epidemiology?

Accepted Answer

Distribution, Determinants, and Deterrents

Answer

Distribution only

Answer

Deterrents only

Answer

Determinants only

Question 3

Retraction of tympanic membrane touching the promontory. What is the classification according to Sade's grading system?

Accepted Answer

Grade 3

Answer

Grade 1

Answer

Grade 2

Answer

Grade 4

Question 4

Which Schistosoma species is primarily associated with eggs being discharged in urine?

Accepted Answer

S. haematobium

Answer

S. japonicum

Answer

S. mansoni

Answer

S. mekongi

Question 5

Most common site for hydatid cyst

Accepted Answer

Liver

Answer

Lung

Answer

Brain

Answer

Kidney

Question 6

What does the hookworm primarily feed on?

Accepted Answer

Blood from intestinal mucosa

Answer

Plasma proteins

Answer

Lymphatic fluid

Answer

Interstitial fluid

Question 7

Most common organism causing ventilator associated pneumonia -

Accepted Answer

Pseudomonas

Answer

Legionella

Answer

Pneumococcus

Answer

Coagulase negative staphylococcus

Question 8

Consumption of uncooked pork is likely to cause which of the following helminthic disease -

Accepted Answer

Taenia solium

Answer

Taenia saginata

Answer

Trichuris trichiura

Answer

None of the options

Question 9

Child having perianal pruritus with the following eggs is due to -

Accepted Answer

E. vermicularis

Answer

Ascaris

Answer

Ancylostoma duodenale

Answer

S. stercoralis

Question 10

Which of the following is the only ovoviviparous parasite among the options provided?

Accepted Answer

Strongyloides

Answer

Ascaris

Answer

Enterobius

Answer

Ancylostoma

NEET-PG 2013

Community Medicine

ENT

Microbiology