NEET-PG 2012 Practice Questions

Q: In epidemiological studies, which type of diagram is most effective for representing disease incidence trends over time?

Line graph. ***Line graph*** - A **line graph** is ideal for visualizing **trends over time** because it connects data points sequentially, making it easy to observe increases, decreases, or stability in disease incidence. - The x-axis typically represents **time intervals** (e.g., years, months), and the y-axis represents the incidence rate, clearly showing how these values change. *Bar graph* - A **bar graph** is generally used for comparing **discrete categories** or displaying quantities for different groups, not for continuous trends over time. - While it can show incidence for different time periods, it doesn't convey the **continuity** or the overall progression as effectively as a line graph. *Scatter plot* - A **scatter plot** is primarily used to display the **relationship between two numerical variables** or to identify correlations. - It does not inherently show a **trend over time** as clearly as a line graph; instead, it shows individual data points and their distribution. *Pie chart* - A **pie chart** is used to show **proportions or percentages** of a whole, making it suitable for displaying the distribution of categories at a single point in time. - It is **not appropriate** for showing changes or trends over time, as it cannot effectively represent sequential data or temporal patterns.

Q: What is the Chandler's Index for Hookworm that indicates a significant health problem?

> 50. ***> 50*** - A Chandler's Index of **> 50** indicates a significant public health problem due to **hookworm infection**. - **Chandler's Index** is calculated as the **average egg count per person in a community** (total hookworm eggs counted ÷ number of persons examined), used to assess the population-level burden of hookworm infection. - A value **> 50** suggests that the community has a significant hookworm problem requiring public health intervention. *> 300* - This value is significantly higher than the threshold for a significant public health problem and would indicate an **extremely severe burden of infection**. - While this represents a very high Chandler's Index, it's not the standard cut-off for defining a "significant" health problem (which is the lower threshold of >50). *> 200* - A Chandler's Index of **> 200** would denote a very high intensity of hookworm infection in the community. - However, this is not the standard threshold used to define when hookworm becomes a "significant" public health issue - the threshold is lower at >50. *> 100* - A Chandler's Index of **> 100** represents a substantial level of hookworm infection within a population. - However, the widely recognized cutoff for a "significant health problem" is **> 50**, indicating public health concern even at this moderate level of community infection burden.

Q: What percentage of waste generated in hospitals is considered infectious?

15-20% of waste is infectious. ***15-20% of waste is infectious*** - This is the **correct answer** as per WHO guidelines and standard biomedical waste management protocols. - Approximately **10-25% of hospital waste is classified as hazardous**, which includes infectious, pathological, sharps, chemical, pharmaceutical, and radioactive waste. - The remaining **75-90% is non-hazardous general waste** similar to domestic waste, including paper, packaging, food waste, and administrative materials. - Proper **waste segregation** is crucial to prevent mixing of infectious waste with general waste, which would unnecessarily increase handling and disposal costs. *65% of waste is infectious* - This is **incorrect** as it grossly overestimates the proportion of infectious waste. - Only a **minority of hospital waste is hazardous/infectious**, not the majority. - Such a high percentage would indicate poor waste segregation practices. *80% of waste is infectious* - This is **incorrect** and represents a severe overestimation. - The vast majority of hospital waste is actually **non-hazardous general waste**. - This misconception can lead to unnecessary treatment of general waste, increasing costs. *100% of waste is infectious* - This is **completely incorrect** and contradicts all biomedical waste management guidelines. - Hospitals generate significant amounts of **general administrative and domestic waste** that is not infectious. - Treating all waste as infectious would be economically unsustainable and environmentally unnecessary.

Q: Which of the following statements is true regarding Diphyllobothrium?

The operculated egg is a diagnostic feature. ***The operculated egg is a diagnostic feature*** - *Diphyllobothrium latum*, also known as the **fish tapeworm**, produces characteristic **operculated eggs** that are oval-shaped with an operculum (cap) at one end and a small knob at the other. - The presence of these **unembryonated eggs** in stool samples is the primary diagnostic method for diphyllobothriasis. *Humans are the only definitive host* - While humans are common definitive hosts, other **fish-eating mammals** such as bears, dogs, and cats can also serve as definitive hosts for *Diphyllobothrium latum*. - The definitive host is where the **adult worm resides** and reproduces sexually. *Vitamin B12 deficiency always occurs in infection* - **Vitamin B12 deficiency (megaloblastic anemia)** is a known complication of *Diphyllobothrium latum* infection, as the worm competes for B12 in the host's intestine. - However, it does **not occur in all infected individuals**; it is estimated to affect a significant minority, typically those with heavy worm burdens or prolonged infection, and can be influenced by dietary intake. *Fish are definitive hosts* - Fish (specifically freshwater fish like pike, perch, and salmon) act as **second intermediate hosts** for *Diphyllobothrium latum*, carrying the **plerocercoid larvae**. - **Humans and other fish-eating mammals** are the definitive hosts, where the plerocercoid larvae mature into adult tapeworms in the small intestine.

Q: Serological testing of patient shows HBsAg, IgM anti-HBc and HBeAg positive. The patient has -

Acute hepatitis B with high infectivity. ***Acute hepatitis B with high infectivity*** - The presence of **HBsAg** (hepatitis B surface antigen) indicates active infection, while **IgM anti-HBc** (IgM antibody to hepatitis B core antigen) is a marker of recent or acute infection [1]. - **HBeAg** (hepatitis B e-antigen) positivity signifies active viral replication and a high likelihood of infectivity [1]. *Chronic hepatitis B with low infectivity (not acute)* - **Chronic hepatitis B** is characterized by the presence of **HBsAg for more than six months**, but **IgM anti-HBc** would typically be negative; instead, **IgG anti-HBc** would be positive [1]. - **Low infectivity** would be indicated by the absence of **HBeAg**, replaced by **anti-HBe** (antibody to HBeAg) [1]. *Chronic hepatitis with high infectivity* - This diagnosis would show positive **HBsAg and HBeAg**, but the absence of **IgM anti-HBc** (presence of **IgG anti-HBc** instead) would distinguish it from acute infection [1]. - The presence of **IgM anti-HBc** is a crucial marker for an acute phase of hepatitis B rather than chronic. *Acute on chronic hepatitis* - This scenario would involve a patient with pre-existing **chronic hepatitis B** (positive HBsAg, IgG anti-HBc) experiencing a new acute flare-up, which could involve a resurgence of **HBeAg** or a new acute viral insult. - While **HBsAg** and **HBeAg** would be positive, the key differentiator would be the presence of both **IgM anti-HBc** (indicating the acute component) and **IgG anti-HBc** (indicating the chronic component), which is not fully described here to confirm acute on chronic.

Q: Which of the following viruses is classified as a poxvirus?

Variola. ***Variola virus*** - **Variola virus** is the causative agent of **smallpox**, a historically significant and highly contagious disease. - It belongs to the **Orthopoxvirus** genus within the **Poxviridae family**, characterized by its large, brick-shaped virion and dsDNA genome. *Coxsackie virus* - **Coxsackieviruses** are part of the **Picornaviridae family**, specifically the **Enterovirus** genus. - They are known to cause a range of diseases including **hand-foot-and-mouth disease**, myocarditis, and aseptic meningitis, and are much smaller than poxviruses. *ECHO virus* - **Echoviruses** (Enteric Cytopathic Human Orphan viruses) are also members of the **Picornaviridae family** and the **Enterovirus** genus. - They are associated with diseases such as **aseptic meningitis**, gastroenteritis, and respiratory infections, completely distinct from poxviruses. *HSV (Herpes Simplex Virus)* - **Herpes Simplex Viruses** belong to the **Herpesviridae family**, characterized by a **linear dsDNA genome** and an enveloped icosahedral capsid. - They cause diseases like **oral and genital herpes** and are structurally and genetically distinct from poxviruses.

Q: When should surgery be performed for congenital cataracts with visual disturbances?

As soon as possible (within 6-10 weeks). ***As soon as possible (within 6-10 weeks)*** - **Early surgical intervention** (within the first few weeks of life) is crucial for congenital cataracts to prevent **irreversible visual deficits**, such as **amblyopia**. - The brain's visual pathways develop rapidly in infancy, and prolonged visual deprivation from cataracts can lead to **permanent impairment**. *After 2 months* - This time frame represents a delay that can increase the risk of **amblyopia** and poorer visual outcomes. - The critical period for visual development is very early in life, making immediate intervention vital. *After 4 months* - A delay of four months significantly increases the likelihood of **dense amblyopia** and **strabismus**, making complete visual rehabilitation much more challenging. - At this age, the potential for achieving good vision post-surgery dramatically decreases due to entrenched abnormal visual processing. *After 1 year* - Performing surgery at one year or later for congenital cataracts is generally considered too late, often resulting in **profound and irreversible amblyopia**. - The visual system will have already established abnormal connections, making significant improvement in visual acuity unlikely.

Q: What type of deposit is commonly associated with age-related macular degeneration?

Drusen. ***Drusen*** - **Drusen** are yellow deposits of extracellular material that accumulate beneath the **retinal pigment epithelium (RPE)**. - Their presence is a hallmark sign of **age-related macular degeneration (AMD)** and can lead to vision loss by disrupting retinal function. *Iron* - While iron can accumulate in ocular tissues in conditions like **siderosis bulbi** (due to retained intraocular foreign bodies), it is not a characteristic deposit of macular degeneration. - Ocular iron deposition typically causes different pathologies, such as retinal dysfunction or glaucoma, rather than AMD. *Lipochrome* - **Lipochrome** refers to a class of pigments, including **lipofuscin**, which can accumulate in cells as a byproduct of cellular metabolism and aging. - Although lipofuscin buildup occurs in the RPE with age, **drusen** are the specific, organized extracellular deposits pathognomonic for macular degeneration. *Hemosiderine* - **Hemosiderin** is an iron-storage complex formed from the breakdown of hemoglobin, found in situations of hemorrhage or chronic bleeding. - It is not a typical deposit found in macular degeneration; its presence in the retina usually indicates a history of retinal hemorrhage.

Q: ER positive status in carcinoma breast indicates?

Prognosis. ***Prognosis*** - **ER positive status** in breast cancer indicates a better prognosis, as these tumors often respond well to hormone therapy [1][2]. - Patients with **ER positive** breast cancer usually have a lower risk of metastasis compared to **ER negative** tumors, making the outcome more favorable [1]. *Site* - ER status does not provide information regarding the **anatomical location** of the breast cancer, as it can be present in different sites of the breast. - It primarily focuses on the **biologic characteristics** of the tumor rather than its site of occurrence [1]. *None* - Selecting 'None' suggests that ER positive status has no relevance, which is incorrect as it is significant for treatment and prognosis [1]. - It is a crucial indicator for deciding on **endocrine therapy**, impacting management strategies in breast cancer patients [1]. *Etiology* - ER positive status does not directly indicate the **cause** of breast cancer, as various genetic and environmental factors contribute to its development. - It mainly reflects tumor behavior and response to therapies, not the **underlying factors** that lead to the disease [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Breast, p. 1056. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Breast, pp. 1064-1066.

Question 1

In epidemiological studies, which type of diagram is most effective for representing disease incidence trends over time?

Accepted Answer

Line graph

Answer

Bar graph

Answer

Scatter plot

Answer

Pie chart

Question 2

What is the Chandler's Index for Hookworm that indicates a significant health problem?

Accepted Answer

> 50

Answer

> 200

Answer

> 100

Answer

> 300

Question 3

What percentage of waste generated in hospitals is considered infectious?

Accepted Answer

15-20% of waste is infectious

Answer

80% of waste is infectious

Answer

100% of waste is infectious

Answer

65% of waste is infectious

Question 4

Which of the following statements is true regarding donovanosis?

Accepted Answer

Painless ulcerative lesions are characteristic of donovanosis

Answer

Pseudolymphadenopathy is characteristic

Answer

Penicillin is used for treatment

Answer

Painful ulcer is characteristic

Question 5

Which of the following statements is true regarding Diphyllobothrium?

Accepted Answer

The operculated egg is a diagnostic feature

Answer

Humans are the only definitive host

Answer

Vitamin B12 deficiency always occurs in infection

Answer

Fish are definitive hosts

Question 6

Serological testing of patient shows HBsAg, IgM anti-HBc and HBeAg positive. The patient has -

Accepted Answer

Acute hepatitis B with high infectivity

Answer

Chronic hepatitis with high infectivity

Answer

Acute on chronic hepatitis

Answer

Chronic hepatitis B with low infectivity (not acute)

Question 7

Which of the following viruses is classified as a poxvirus?

Accepted Answer

Variola

Answer

Coxsackie

Answer

ECHO

Answer

HSV

Question 8

When should surgery be performed for congenital cataracts with visual disturbances?

Accepted Answer

As soon as possible (within 6-10 weeks)

Answer

After 2 months

Answer

After 4 months

Answer

After 1 year

Question 9

What type of deposit is commonly associated with age-related macular degeneration?

Accepted Answer

Drusen

Answer

Iron

Answer

Lipochrome

Answer

Hemosiderine

Question 10

ER positive status in carcinoma breast indicates?

Accepted Answer

Prognosis

Answer

Etiology

Answer

Site

Answer

None of the options

NEET-PG 2012

Community Medicine

Dermatology

Microbiology

Ophthalmology

Pathology