Urban Health — MCQs

Urban Health Indian Medical PG Practice Questions and MCQs

Question 11: Anopheles species responsible for the transmission of malaria in urban areas is

A. Anopheles sundaicus
B. Anopheles stephensi (Correct Answer)
C. Anopheles fluviatilis
D. Anopheles culicifacies

Explanation: **Anopheles stephensi** - **Anopheles stephensi** is recognized as the primary vector for malaria transmission in **urban areas** of the Indian subcontinent due to its ability to breed in man-made water containers and adaptation to urban environments. - It exhibits **endophilic** (resting indoors) and **anthropophilic** (preferring human blood) behaviors, increasing its efficiency in transmitting malaria in human-dense urban settings. *Anopheles sundaicus* - **Anopheles sundaicus** is primarily found in **coastal saline water** and brackish water environments, making it a significant vector in coastal regions rather than typical urban settings. - It is known for transmitting malaria in **swampy and estuarine areas**, which are not characteristic of most urban landscapes. *Anopheles fluviatilis* - **Anopheles fluviatilis** is a major vector in **hilly and forested areas** of India, breeding in clean, flowing water like streams and rivulets. - Its breeding habitats and geographical distribution are typically associated with **rural and foothill regions**, not major urban centers. *Anopheles culicifacies* - **Anopheles culicifacies** is the most important vector for malaria in **rural areas** of India, breeding in a variety of rural water sources such as agricultural fields, wells, and ponds. - While it can be found on the outskirts of urban areas, it is not the primary urban vector and is more strongly associated with **agricultural and village environments**.

Question 12: Urban health center caters to a minimum population of:

A. 10 thousand
B. 50 thousand (Correct Answer)
C. 10 lakh
D. 1 lakh

Explanation: ***50 thousand*** - An Urban Health Center (UHC) is designed to serve a population ranging from **50,000 to 1,00,000 individuals** in urban areas. - **50,000 is the minimum population coverage** for establishing a UHC under the National Urban Health Mission (NUHM) guidelines. - This ensures adequate service delivery for comprehensive primary healthcare including preventive, curative, and rehabilitative care. *10 thousand* - This population size is typically associated with a **Sub-Centre** in rural areas, which is the most peripheral healthcare unit. - An Urban Health Center is intended to serve a significantly larger population than 10,000. *10 lakh* - A population of 10 lakh (**one million**) is far too large for a single Urban Health Center to cater to effectively. - Such a large population would require multiple UHCs or higher-level healthcare facilities like district hospitals. *1 lakh* - While 1 lakh (1,00,000) represents the **upper range** of UHC coverage, the question asks for the minimum population. - **50,000 is the established minimum threshold** as per NUHM norms for setting up an Urban Health Center. - The standard norm is one UHC per 50,000-1,00,000 urban population, with 50,000 being the baseline.

Question 13: Which Anopheles species is commonly found in urban areas?

A. None of the options
B. Anopheles fluviatilis
C. Anopheles culicifacies
D. Anopheles stephensi (Correct Answer)

Explanation: ***Stephensi*** - **Anopheles stephensi** is well-known for its ability to adapt and thrive in **urban environments**, utilizing man-made breeding sites like cisterns, overhead tanks, and construction sites. - Its presence in urban areas makes it a significant vector for **malaria transmission** in cities across Asia and the Middle East, posing a public health challenge. *Culicifacies* - **Anopheles culicifacies** is primarily found in **rural and semi-urban areas**, where it breeds in natural water collections such as irrigation channels, rice fields, and ponds. - While it is a major vector in many regions, it is less commonly associated with densely populated urban centers compared to Anopheles stephensi. *None of the options* - This option is incorrect as **Anopheles stephensi** is recognized as a significant urban malaria vector. - Specific Anopheles species exhibit distinct ecological preferences, and some are highly adapted to urban settings. *Fluvitalis* - **Anopheles fluviatilis** is typically found in **hilly and forested areas**, breeding in clear, slow-moving streams and rivers. - Its ecological niche is generally restricted to natural rural environments, not urban conglomerations.

Question 14: Which of the following diseases shows the LEAST difference in incidence between rural and urban populations?

A. Lung Cancer
B. TB (Correct Answer)
C. Bronchitis
D. Mental illness

Explanation: ***Correct: TB*** - **Tuberculosis (TB)** shows relatively **similar incidence rates** in both rural and urban populations in India, making it the disease with the **LEAST difference** between the two settings. - While urban areas have **overcrowding and slums** as risk factors, rural areas have **poverty, malnutrition, and poor access to healthcare**, which are equally important TB risk factors. - TB is endemic in India across all geographic settings, with the disease burden driven more by **socioeconomic factors** than by rural vs urban location per se. - Both settings face challenges with **poor ventilation** (urban slums vs rural housing), **poverty**, and **inadequate sanitation**. *Incorrect: Lung Cancer* - Lung cancer shows a **clear urban predominance** due to higher exposure to **industrial air pollution**, **vehicular emissions**, and **occupational carcinogens**. - Urban populations historically had higher smoking rates, though this gap is narrowing. - Rural areas have significantly lower lung cancer incidence. *Incorrect: Bronchitis* - Chronic bronchitis is **more common in urban areas** due to **air pollution** from industries and vehicles. - While rural areas may have biomass fuel smoke exposure, the overall incidence of bronchitis shows notable rural-urban differences. - Urban environmental factors contribute to higher prevalence of chronic obstructive airway diseases. *Incorrect: Mental illness* - While mental illness occurs in both settings, there are **differences in types and recognition**. - Urban areas may have higher reported rates due to better access to mental health services and less stigma in seeking care. - Rural areas face challenges with **underdiagnosis** and **limited mental health infrastructure**, making true incidence comparisons difficult.

Question 15: Urban malaria is spread by

A. Anopheles stephensi (Correct Answer)
B. Culex fatigans
C. Anopheles gambiae
D. Anopheles culicifacies

Explanation: ***Anopheles stephensi*** - This mosquito species is a predominant vector for **urban malaria**, particularly in India and the Middle East, due to its ability to breed in artificial containers and urban water sources. - Its presence in urban environments facilitates the transmission of malaria in densely populated areas. *Culex fatigans* - This species is better known as **Culex quinquefasciatus** and is a primary vector for **filariasis** (elephantiasis), not malaria. - It also transmits **West Nile virus** and **Japanese encephalitis**, but is not a significant vector for human malaria. *Anopheles gambiae* - This is the primary vector for malaria in **sub-Saharan Africa** due to its highly efficient transmission and opportunistic breeding habits. - While it causes significant malaria burden globally, its distribution is largely rural and sub-Saharan, not typically urban malaria in the context of the Indian subcontinent. *Anopheles culicifacies* - This species is a major vector for **rural malaria in India**, thriving in agricultural areas and fresh water collections. - It is not typically associated with the spread of malaria in densely populated urban settings, unlike *Anopheles stephensi*.

Question 16: What is a key feature of the National Urban Health Mission?

A. To focus on health challenges specifically in urban areas (Correct Answer)
B. To enhance healthcare facilities in urban areas
C. To improve health services in rural areas
D. To provide healthcare for all residents in urban areas

Explanation: ***To focus on health challenges specifically in urban areas*** - The **National Urban Health Mission (NUHM)** was launched specifically to address the unique and growing health needs of the urban population. - It targets challenges such as **poor sanitation**, **overcrowding**, and the specific health issues faced by the **urban poor** and marginalized groups. *To enhance healthcare facilities in urban areas* - While enhancing facilities is a component, the primary focus is on addressing the **specific health challenges** and gaps in service delivery unique to urban settings, not just general enhancement. - This option is broader and doesn't capture the **targeted problem-solving** aspect of NUHM's mandate. *To improve health services in rural areas* - This is the primary objective of the **National Rural Health Mission (NRHM)**, which is distinct from the NUHM. - The NUHM's scope is explicitly limited to **urban areas**. *To provide healthcare for all residents in urban areas* - While comprehensive healthcare is a goal, NUHM specifically targets **vulnerable sections** of the urban population, particularly the urban poor. - Its focus is on making services **accessible and equitable**, rather than just a blanket provision for all residents irrespective of need.

Question 17: A community health survey finds that the prevalence of hypertension is higher in urban areas compared to rural areas. What is the most likely reason for this difference?

A. Increased salt consumption in urban areas (Correct Answer)
B. Improved healthcare access in rural areas
C. Lower stress levels in rural areas
D. Higher physical activity levels in rural areas

Explanation: ***Increased salt consumption in urban areas*** - **Urban diets** often contain more **processed foods** and **fast foods**, which are typically high in **sodium**, contributing to higher blood pressure and hypertension prevalence. - **Epidemiological evidence** consistently shows urban populations have higher dietary sodium intake compared to rural populations who consume more fresh, home-cooked foods. - Urban lifestyle factors including greater access to **restaurant meals, packaged snacks**, and **processed foods** significantly increase average **dietary salt intake**. - This combines with other urban risk factors like **sedentary lifestyle, obesity, tobacco use**, and **chronic stress** to create a higher hypertension burden. *Improved healthcare access in rural areas* - This statement is **factually incorrect**; healthcare access is typically more **limited in rural areas** compared to urban areas. - Urban areas have better access to **diagnostic facilities, specialists**, and **screening programs**, leading to higher detection rates. - Better healthcare access would improve **detection and management** of hypertension, but wouldn't explain the true prevalence difference. *Lower stress levels in rural areas* - **Stress levels** exist in both settings with different stressors. Rural populations face significant stress from **financial instability, agricultural uncertainties**, and **lack of resources**. - Urban stress (work pressure, pollution, crowding) and rural stress (economic vulnerability, isolation) are qualitatively different but not necessarily quantitatively lower in rural areas. - Chronic stress contributes to hypertension, but there's insufficient evidence that rural-urban stress differences alone explain the prevalence gap. *Higher physical activity levels in rural areas* - While historically rural occupations involved more physical labor, **increasing mechanization** and **changing lifestyles** have narrowed this gap. - Even if physical activity is higher in rural areas, this would be **protective against hypertension**, explaining lower rural prevalence—not higher urban prevalence. - **Sedentary behavior** is now prevalent in both settings, though urban populations may have higher rates due to desk jobs and transportation patterns.

Question 18: Which statement best describes the criteria for starting an urban community health center?

A. Caters to a population of 1-1.5 lakh (Correct Answer)
B. Referral center for 2-3 primary health centers
C. Should have a 100-bed facility in metro cities
D. No sub-district and district hospitals present in the area

Explanation: ***Caters to a population of 1-1.5 lakh*** - An **urban community health center (UCHC)** is designed to provide comprehensive primary healthcare services to an urban population of **1 to 1.5 lakh**. - This population criterion ensures effective service delivery and proper resource allocation for a designated urban area. *Referral center for 2-3 primary health centers* - This description typically applies to a **sub-district hospital** or a higher-level facility, which serve as referral centers for multiple primary health centers. - A UCHC primarily focuses on direct provision of primary care, not usually acting as a referral hub for other primary care units. *Should have a 100-bed facility in metro cities* - A **100-bed facility** is characteristic of a larger hospital, such as a district hospital, not an urban community health center. - UCHCs typically have minimal or no inpatient beds, focusing on outpatient services and emergency care rather than extensive hospitalization. *No sub-district and district hospitals present in the area* - This statement is not a criteria for a UCHC; in fact, UCHCs often function within a healthcare system that includes larger hospitals for referral of complex cases. - The presence or absence of higher-level facilities does not define the necessity or establishment of a UCHC.

Question 19: Which of the following larvicide is used under urban Malaria Scheme?

A. Malathion
B. Parathion
C. DDT
D. Abate (Correct Answer)

Explanation: ***Abate*** - **Abate (temephos)** is an organophosphate larvicide widely used in public health programs, including the urban malaria scheme, due to its effectiveness against mosquito larvae at low concentrations. - It is applied to water storage containers, wells, and other mosquito breeding sites to **prevent the development of adult mosquitoes**. *Malathion* - **Malathion** is an organophosphate insecticide primarily used as an **adulticide** for fogging operations against adult mosquitoes, not specifically as a larvicide in urban schemes. - While it can kill larvae, its primary application and efficacy are geared towards **adult mosquito control**. *Parathion* - **Parathion** is a highly toxic organophosphate insecticide that is generally **not used in public health programs** due to its significant environmental and human health risks. - Its use is largely restricted to agricultural pest control and is **not a recommended larvicide** for urban settings. *DDT* - **DDT (dichlorodiphenyltrichloroethane)** is a persistent organic pollutant whose use has been largely banned or severely restricted globally due to its **environmental impact** and long-term toxicity. - While historically used for mosquito control (both larvae and adults), it is **not used in current urban malaria schemes** due to its banned status in many regions and resistance issues.

Question 20: Which of the following is a criterion for overcrowding?

A. Floor space (Correct Answer)
B. Sex separation
C. Door and window
D. Number of persons

Explanation: ***Floor space*** - **Floor space per person** is the most fundamental criterion for assessing overcrowding, as inadequate space leads to poor ventilation and increased disease transmission. - Public health guidelines (WHO, Indian standards) specify a **minimum floor area** per occupant (typically 40-50 sq ft per person) to prevent overcrowding and associated health risks. - This is a **direct quantitative measure** that objectively defines overcrowding. *Sex separation* - **Sex separation** is a criterion for privacy, decency, and housing quality, particularly in shared living spaces, but not a measure of physical overcrowding. - It relates to **social and cultural considerations** rather than occupancy density or physical capacity of a dwelling. *Door and window* - The presence and adequacy of **doors and windows** are criteria for ventilation, natural light, and safety, contributing to overall habitability. - While important for health, these features define **housing quality** rather than **overcrowding**, which is primarily based on occupant-to-space ratios. *Number of persons* - The **number of persons alone** is insufficient as a criterion without spatial context. - While **persons per room** (>2 persons/room) is a valid overcrowding criterion, the absolute number of persons must be considered **in relation to available space** (floor area or rooms) to be meaningful. - A large family in a spacious dwelling is not overcrowded, whereas few persons in a confined space could be, illustrating that **person count alone cannot define overcrowding**.

Practice by Chapter

Urban Health Challenges

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Urbanization and Health

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Urban Slum Health

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Urban Health Mission

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Healthcare Delivery in Urban Areas

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Urban Water Supply and Sanitation

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Urban Pollution Management

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Healthy Cities Concept

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Migration and Health

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Urban Disease Patterns

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Urban Nutrition Issues

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Urban Healthcare Planning

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