NEET-PG 2012 - Community Medicine Practice Questions

Q: Which of the following best describes the concept where a suspected cause precedes the observed effect?

Temporal association. ***Temporal association*** - This principle in **causal inference** emphasizes that for a factor to be a cause, it must precede the effect. - In epidemiology, it's crucial to establish that exposure occurred **before the disease manifestation**. *Consistency of association* - Refers to the observation of a **similar association across different studies** and populations. - While important for causal inference, it does not directly address the timing of cause and effect. *Strength of association* - Quantifies how often the **exposure and outcome co-occur**, often measured by relative risk or odds ratio. - A strong association is more likely to be causal, but it doesn't confirm that the cause came before the effect. *Coherence of association* - Implies that the observed association should be **consistent with existing biological and medical knowledge**. - This criterion supports the plausibility of an association but doesn't specifically deal with the temporal sequence.

Q: What is the minimum percentage of the population that needs to be vaccinated to eradicate measles?

95%. **95%** - Measles is highly contagious, requiring a **high percentage of immunity** in the population to establish **herd immunity** and prevent outbreaks. - A **95% vaccination coverage** ensures that enough individuals are protected, breaking the chain of transmission and leading to potential eradication. *85%* - This percentage is **insufficient** for highly transmissible diseases like measles. - An 85% vaccination rate would still leave a significant portion of the population susceptible, allowing measles to **continue circulating** and causing outbreaks. *70%* - This level of vaccination is **far too low** for measles, which has a basic reproduction number (R0) of 12-18. - A 70% coverage would result in frequent and widespread measles outbreaks due to **inadequate herd immunity**. *80%* - While 80% vaccination offers some protection, it is still **below the threshold** needed for measles eradication. - Measles outbreaks can still occur with an 80% coverage, particularly in populations with **non-uniform distribution of immunity**.

Q: What is the standard amount of diphtheria toxoid in the DT vaccine?

30 Lf. ***30 Lf*** - The **DT vaccine** (pediatric diphtheria-tetanus vaccine) contains **30 Lf** of **diphtheria toxoid** per dose according to traditional formulations, along with tetanus toxoid. - This higher diphtheria toxoid content is standardized for vaccines administered to children younger than 7 years. - Note: Modern vaccine standards often express potency in **International Units (IU)** where ≥30 IU corresponds to approximately 15-25 Lf, though 30 Lf was the traditional specification. *5 Lf* - This reduced amount of diphtheria toxoid is present in adult formulations like **Tdap vaccine** and **Td vaccine** (typically 2-5 Lf). - The lower diphtheria toxoid content in adult vaccines is sufficient to maintain immunity in individuals with pre-existing immunity from childhood vaccination. *10 Lf* - This amount of diphtheria toxoid is not a standard specification for DT, Td, or Tdap vaccines. - Standard diphtheria toxoid amounts are typically 15-30 Lf for pediatric formulations (DT/DTP) and 2-5 Lf for adult formulations (Td, Tdap). *15 Lf* - While approximately 15 Lf may correspond to the minimum potency when measured in International Units (≥30 IU), the traditional standard specification for DT vaccine is **30 Lf**. - Vaccine formulations are precisely standardized to ensure optimal immunogenicity and safety.

Q: What is the most commonly reported bacterial sexually transmitted infection?

Chlamydia. ***Correct: Chlamydia*** - **Chlamydia trachomatis** is the most frequently reported bacterial STI in many countries, often being **asymptomatic** and thus easily spread - Its high prevalence is due to efficient transmission and the widespread use of sensitive diagnostic tests that detect infections in asymptomatic individuals - Accounts for the majority of reported bacterial STI cases globally *Incorrect: HSV* - **Herpes Simplex Virus (HSV)** is a **viral STI**, not bacterial, and is characterized by recurrent outbreaks of **genital ulcers** or sores - While common, it does not qualify as a bacterial infection and is often not laboratory-confirmed due to mild or subclinical presentations *Incorrect: HIV* - **Human Immunodeficiency Virus (HIV)** is also a **viral STI**, not bacterial, that attacks the immune system leading to AIDS - Although highly impactful, HIV is not a bacterial infection and has lower incidence rates compared to Chlamydia *Incorrect: Syphilis* - **Syphilis**, caused by the bacterium **Treponema pallidum**, is a serious bacterial STI that can have long-term complications if untreated - While its incidence has been increasing in some regions, it is significantly less common than **Chlamydia** in terms of overall reported cases

Q: Which organization among the following is specifically mandated to work on reproductive health and family planning globally?

UNFPA. ***UNFPA*** - The **United Nations Population Fund (UNFPA)** is the lead UN agency for delivering a world where every pregnancy is wanted, every birth is safe, and every young person's potential is fulfilled. - Its mandate specifically focuses on **sexual and reproductive health (SRH)**, family planning, and maternal health worldwide. *UNICEF* - The **United Nations Children's Fund (UNICEF)** focuses on providing humanitarian and developmental aid to children worldwide, prioritizing their health, education, and protection. - While it addresses child health, its primary mandate is not exclusive to reproductive health or family planning. *ILO* - The **International Labour Organization (ILO)** is a United Nations agency whose mandate is to advance social and economic justice by establishing international labor standards. - Its work focuses on labor rights, decent work, and social protection, not reproductive health. *WHO* - The **World Health Organization (WHO)** works broadly on all aspects of global health including infectious diseases, non-communicable diseases, health systems, and emergency response. - While WHO does work on reproductive health, it is not specifically mandated exclusively for reproductive health and family planning like UNFPA.

Q: What is the most common method of family planning sterilization practiced in India?

Female sterilization. ***Female sterilization*** - **Female sterilization** (tubal ligation) is the most prevalent method of permanent contraception in India, accounting for over **95% of all sterilization procedures**. - This is primarily due to historical policies focusing on female methods and various **socio-cultural factors** including gender norms and male reluctance. - According to **NFHS data**, female sterilization is the single most common contraceptive method overall in India. *Male sterilization* - **Male sterilization** (vasectomy) is significantly less common compared to female sterilization in India, accounting for less than 5% of sterilization procedures. - This disparity is attributed to **gender norms**, misconceptions about masculinity, and limited promotion of vasectomy services. *Condom use* - While condoms are a common **temporary contraceptive method**, the question specifically asks about **sterilization methods**, which are permanent. - Condoms are barrier methods, not sterilization procedures. *Intrauterine device (IUD)* - IUDs are **reversible long-acting contraceptive methods**, not sterilization procedures. - Though IUDs are increasingly popular in India, they do not constitute a sterilization method as they can be removed.

Q: According to WHO guidelines, what prevalence of Bitot's spots indicates a public health problem?

≥ 0.5% prevalence. ***≥ 0.5% prevalence*** - According to **WHO guidelines**, a prevalence of Bitot's spots of **≥ 0.5%** (greater than or equal to 0.5%) in children aged 6-71 months indicates a **moderate public health problem** related to **vitamin A deficiency**. - This threshold is used for **programmatic decision-making** and intervention strategies to combat **xerophthalmia** (vitamin A deficiency eye disease). - At **≥ 1.0%** prevalence, it indicates a **severe public health problem**. *> 1% prevalence* - While ≥ 1% prevalence indicates a **severe public health problem**, the **initial WHO threshold** for identifying a public health problem due to **vitamin A deficiency** as indicated by Bitot's spots is **≥ 0.5%**. - This allows for **earlier public health action** before the situation becomes severe. *> 2% prevalence* - A prevalence of 2% implies a **critical vitamin A deficiency situation**, far exceeding the **WHO's diagnostic threshold** for initiating public health interventions. - Interventions would be critically urgent at this level, but the criteria for recognizing a problem are met at **≥ 0.5%**. *None of the options* - This option is incorrect because the **WHO has specific guidelines** for the prevalence of **Bitot's spots** that indicate a public health problem. - The correct threshold of **≥ 0.5%** is provided among the choices, which is the established criterion for a **moderate public health problem**.

Q: Secondary prevention is applicable to

Early stage of disease. ***Early stage of disease*** - **Secondary prevention** focuses on early detection and prompt treatment to halt the progression of an existing disease. - This stage is crucial for interventions like **screening tests** and **early diagnosis**, which aim to minimize the impact of the disease once it has begun. *Factors leading to disease* - This relates to **primary prevention**, which aims to prevent the disease from occurring in the first place by addressing risk factors or promoting health. - Examples include **vaccination** or promoting healthy lifestyle choices. *Advanced stage of disease* - This is the domain of **tertiary prevention**, which focuses on managing the disease, preventing complications, and improving quality of life once the disease is well-established. - Rehabilitation and long-term care are key aspects of this stage. *None of the options* - This option is incorrect because secondary prevention specifically targets the **early stage of disease** to prevent further progression and adverse outcomes.

Q: Who made the statement 'The secret of national health lies in the homes of people'?

Bhore. ***Bhore (Bhore Committee Report, 1946)*** - This famous statement emphasizes the importance of **community-level health** and the role of individuals and families in maintaining national health. - The **Bhore Committee**, chaired by Sir Joseph Bhore in colonial India (1943-1946), was a landmark Health Survey and Development Committee that laid the foundation for India's health policy. - The committee highlighted the need for **primary healthcare at the grassroots level**, accessibility of health services, and the integration of preventive and curative services. - This philosophy remains foundational to India's public health approach and community medicine. *Indira Gandhi* - While a prominent Prime Minister of India who contributed significantly to national development programs and social welfare initiatives, this specific statement is not attributed to her. - Her health-related contributions included the **National Health Policy** discussions and family planning programs, but this quote predates her political leadership. *Abraham Lincoln* - As the 16th U.S. President (1861-1865), his leadership focused on the Civil War and abolition of slavery. - His famous speeches include the Gettysburg Address with "**government of the people, by the people, for the people**" but do not address national health in this specific manner. *Florence Nightingale* - A pioneer of modern nursing and founder of professional nursing education, she emphasized **sanitation**, hygiene, and patient care. - While she revolutionized hospital conditions and public health nursing, particularly during the Crimean War (1853-1856), this exact quote is not attributed to her. - Her focus was on **evidence-based nursing practice** and improving hospital sanitation standards.

Q: Which disease is associated with a propagative cycle?

Filaria. ***Filaria*** - The **filarial worm** undergoes a **biological transmission cycle** in the mosquito vector where microfilariae develop through larval stages (L1 → L2 → L3) with multiplication. - This represents a **cyclopropagative cycle** (both development and multiplication occur in the vector). - In the context of this question and classical teaching, filaria is considered the standard example of biological transmission with vector multiplication. - The infective L3 larvae multiply from a single microfilaria, and multiple larvae can develop within one mosquito. *Plague* - **Plague** (*Yersinia pestis*) is transmitted by fleas through **mechanical transmission**. - Bacteria multiply in the flea's gut causing blockage (blocking transmission), but this is not considered a true biological cycle. - The pathogen does not undergo developmental stages in the vector. *Malaria* - **Malaria** (*Plasmodium* spp.) undergoes the **sporogonic cycle** in the mosquito, which is also a **cyclopropagative cycle**. - Gametocytes → ookinete → oocyst → sporozoites (development with multiplication). - While biologically similar to filaria, in classical epidemiology teaching, filaria is more commonly cited as the example for propagative transmission. *None of the options* - This option is incorrect as filaria demonstrates biological transmission with multiplication in the vector. - Both filaria and malaria technically undergo cyclopropagative cycles, but filaria is the conventional answer in medical education contexts.

Question 1

Which of the following best describes the concept where a suspected cause precedes the observed effect?

Accepted Answer

Temporal association

Answer

Consistency of association

Answer

Strength of association

Answer

Coherence of association

Question 2

What is the minimum percentage of the population that needs to be vaccinated to eradicate measles?

Accepted Answer

95%

Answer

85%

Answer

70%

Answer

80%

Question 3

What is the standard amount of diphtheria toxoid in the DT vaccine?

Accepted Answer

30 Lf

Answer

5 Lf

Answer

10 Lf

Answer

15 Lf

Question 4

What is the most commonly reported bacterial sexually transmitted infection?

Accepted Answer

Chlamydia

Answer

HSV

Answer

HIV

Answer

Syphilis

Question 5

Which organization among the following is specifically mandated to work on reproductive health and family planning globally?

Accepted Answer

UNFPA

Answer

UNICEF

Answer

ILO

Answer

WHO

Question 6

What is the most common method of family planning sterilization practiced in India?

Accepted Answer

Female sterilization

Answer

Male sterilization

Answer

Intrauterine device (IUD)

Answer

Condom use

Question 7

According to WHO guidelines, what prevalence of Bitot's spots indicates a public health problem?

Accepted Answer

≥ 0.5% prevalence

Answer

> 1% prevalence

Answer

> 2% prevalence

Answer

None of the options

Question 8

Secondary prevention is applicable to

Accepted Answer

Early stage of disease

Answer

Factors leading to disease

Answer

Advanced stage of disease

Answer

None of the options

Question 9

Who made the statement 'The secret of national health lies in the homes of people'?

Accepted Answer

Bhore

Answer

Indira Gandhi

Answer

Florence Nightingale

Answer

Abraham Lincoln

Question 10

Which disease is associated with a propagative cycle?

Accepted Answer

Filaria

Answer

None of the options

Answer

Plague

Answer

Malaria

NEET-PG 2012 — Community Medicine