UGC NTA NET/JRF Exam, Social Medicine & Community Health, February-2023

A Case-Cohort study is a design where in the controls are a random sample of the main cohort, irrespective of their exposure status. The distinction between the case-cohort study and the nested case-control study is in the selection of controls.

In a nested case-control, controls are matched to cases by certain criteria, often calendar time. However, in a case-cohort study, controls are a random sample of the entire cohort and are not matched to cases by any criteria.

This provides the flexibility to evaluate multiple outcomes without selecting a new set of controls for each outcome, which can be useful in many epidemiological settings.

When a long-term smoker quits, the risk of heart disease decreases substantially within a relatively short period. It does not instantly match the risk level of a non-smoker, but the reduction is significant.

Specifically, within one year of quitting, the risk of heart disease is about half that of a smoker. Over time, this risk continues to decline, and after about 15 years, the risk is nearly that of a non-smoker.

However, it's essential to note that the earlier in life a person quits smoking, the more they reduce their risk of heart disease and other health complications.

The World Health Assembly at AlmaAta launched the "Health for All (HFA)" by the year 2000 AD in 1978. The Alma-Ata Declaration emphasized primary health care as the means to achieving the goal of Health for All.

It represented a significant shift in global health thinking, focusing on health equity, community involvement, and the importance of health system strengthening at the primary care level.

The Sparsh campaign was initiated to spread awareness about leprosy and to tackle the stigma and discrimination associated with it.

It was launched on Anti Leprosy Day in 2013. One of its main objectives was to empower local communities to sensitize people about the disease.

The campaign also aimed to promote community participation. However, it was not a program specifically for orphan and vulnerable children.

Aedes Aegypti is the primary vector for transmitting the dengue fever virus. Dengue fever is a mosquito-borne tropical disease that results in flu-like symptoms.

In severe cases, it can evolve into dengue hemorrhagic fever or dengue shock syndrome, which can be life-threatening. Aedes Aegypti mosquitoes are also responsible for transmitting other diseases like Zika, chikungunya, and yellow fever.

It's crucial to manage and reduce the populations of these mosquitoes, especially in areas prone to these diseases, to prevent outbreaks.

The risk of an HIV-positive pregnant woman transmitting the virus to her baby, without any intervention, is estimated to be between 15-45%, with 25% being a commonly cited figure.

However, with appropriate antiretroviral treatment and other preventive measures, this risk can be reduced to below 5%.

It's crucial for pregnant women to be tested for HIV early in their pregnancy, and if positive, to receive the necessary care and treatment to reduce the risk of mother-tochild transmission.

Epidemic control measures include early detection and prompt treatment, vaccination (for diseases for which vaccines exist), health education to prevent and reduce disease transmission, and sometimes, isolation of cases to prevent disease spread.

Mass chemoprophylaxis, which involves providing medications to large groups of people who might be at risk of a disease but are not necessarily ill, is not always an accepted method of control for all epidemics.

Its application needs to be very specific, depending on the disease, the context, and the risk of side effects versus benefits.

When travelling to malaria-endemic areas, short-term chemoprophylaxis can help in preventing the disease. Doxycycline, taken daily, is one of the recommended regimens for travellers.

It should be started 1-2 days before travel, taken daily during travel, and continued for 4 weeks after leaving the endemic area.

Apart from its efficacy against malaria, a significant advantage of doxycycline is that it also provides protection against bacterial diarrhea, a common problem for travellers. However, it's essential to be aware of its side effects and contraindications.

The primary distinction between proteins and carbohydrates or fats is that proteins contain nitrogen.

While carbohydrates and fats primarily provide energy and are made up of carbon, hydrogen, and oxygen, proteins are composed of amino acids, which contain nitrogen.

This makes proteins essential for various body functions beyond energy provision, including tissue repair, enzyme function, and hormone synthesis.

Proteins are the building blocks of the body, and their nitrogen-containing structure plays a critical role in many biological processes.