Question: What Three Factors Interact In The Natural History Of Disease?

What are the three major factors of the epidemiologic triangle?

The epidemiologic triangle is made up of three parts: agent, host and environment..

Why poor health is the major cause of disease?

Overcrowded and poor living conditions can contribute to the spread of airborne diseases such as tuberculosis and respiratory infections such as pneumonia. Reliance on open fires or traditional stoves can lead to deadly indoor air pollution. A lack of food, clean water and sanitation can also be fatal.

What are the 5 W’s of epidemiology?

The difference is that epidemiologists tend to use synonyms for the 5 W’s: diagnosis or health event (what), person (who), place (where), time (when), and causes, risk factors, and modes of transmission (why/how).

What is the epidemiological triangle?

The Epidemiologic Triangle, sometimes referred to as the Epidemiologic Triad, is a tool that scientists use for addressing the three components that contribute to the spread of disease: an external agent, a susceptible host and an environment that brings the agent and host together.

What are epidemiological determinants of Ebola?

Although observed modes of transmission mainly include direct contact and contaminated staff, high case fatality ratio and frequent contacts among individuals in developed countries are among determinants which may lead to the development of the EVD outbreak.

What are the 3 factors that cause disease?

Infectious diseases can be caused by:Bacteria. These one-cell organisms are responsible for illnesses such as strep throat, urinary tract infections and tuberculosis.Viruses. Even smaller than bacteria, viruses cause a multitude of diseases ranging from the common cold to AIDS.Fungi. … Parasites.

What are the stages in the natural history of disease?

Events that occur in the natural history of a communicable disease are grouped into four stages: exposure, infection, infectious disease, and outcome (see Figure 1.6). We will briefly discuss each of them in turn.

What does natural history of a disease mean?

Natural history of disease refers to the progression of a disease process in an individual over time, in the absence of treatment.

What are the 4 stages of disease?

The periods of disease include the incubation period, the prodromal period, the period of illness, the period of decline, and the period of convalescence. These periods are marked by changes in the number of infectious agents and the severity of signs and symptoms.

How is helpful for understanding natural history of any disease?

One of the reasons that natural history studies are so important is that they help a rare disease, such as Dravet syndrome, to be better understood. It studies the hallmarks of the disease and how they progress over time, while unfolding patterns that might otherwise go unnoticed.

What factors contribute to disease?

Many factors are contributing to disease emergence, including climate change, globalization and urbanization, and most of these factors are to some extent caused by humans. Pathogens may be more or less prone to emergence in themselves, and rapidly mutating viruses are more common among the emerging pathogens.

What disease has the shortest incubation period?

Incubation Period of Common DiseasesAdenovirus – 2 to 14 days, leading to a sore throat, fever, and pink eye.Vomiting after exposure to Bacillus cereus, a type of food poisoning – 30 minutes to 6 hours (very short incubation period)Clostridium tetani (Tetanus) – 3 to 21 days.Chickenpox – 10 to 21 days.More items…