Question: What Are The Four Stages Of Natural History Of Disease?

What is meant by natural history of disease?

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

For example, untreated infection with HIV causes a spectrum of clinical problems beginning at the time of seroconversion (primary HIV) and terminating with AIDS and usually death..

What are the 4 types of infectious diseases?

A variety of microorganisms can cause disease. Pathogenic organisms are of five main types: viruses, bacteria, fungi, protozoa, and worms.

What does nature of disease mean?

Nature: the principal physical characteristic(s) of the injury or illness. Part of Body Affected: the part of the body directly affected by the previously identified nature of injury or illness.

What are the 3 types of prevention?

The three levels of preventive care—primary, secondary, and tertiary care—are detailed below:Primary Prevention. Primary prevention aims to avoid the development of a disease or disability in healthy individuals. … Secondary Prevention. … Tertiary Prevention.

What is convalescent stage?

Convalescence is the gradual recovery of health and strength after illness or injury. It refers to the later stage of an infectious disease or illness when the patient recovers and returns to previous health, but may continue to be a source of infection to others even if feeling better.

How can the chain of infection be broken?

Break the chain by cleaning your hands frequently, staying up to date on your vaccines (including the flu shot), covering coughs and sneezes and staying home when sick, following the rules for standard and contact isolation, using personal protective equipment the right way, cleaning and disinfecting the environment, …

What is incubation period of disease?

Abstract: The incubation period of an infectious disease is the time interval between the exposure to a disease-causing infectious agent and the onset of symptomatic (clinical) disease.

What are the four stages of disease development?

10.3B: Disease DevelopmentStages of Disease.STAGE 1: INCUBATION PERIOD.STAGE 2: PRODROMAL PERIOD.STAGE 3: ACUTE PERIOD.STAGE 4: CONVALESCENCE PERIOD.

What is the illness stage?

During the illness stage, symptoms characteristic of a particular disease are recognized. It is also at this stage that the infectious disease is highly communicable. When the patient overcomes the disease, the ensuing stage is the convalescent period. Also called: illness stage.

How does disease develop?

Infection occurs when viruses, bacteria, or other microbes enter your body and begin to multiply. Disease, which typically happens in a small proportion of infected people, occurs when the cells in your body are damaged as a result of infection, and signs and symptoms of an illness appear.

What three factors interact in the natural history of disease?

Among the simplest of these is the epidemiologic triad or triangle, the traditional model for infectious disease. The triad consists of an external agent, a susceptible host, and an environment that brings the host and agent together.

What are the 5 stages of disease?

The five periods of disease (sometimes referred to as stages or phases) include the incubation, prodromal, illness, decline, and convalescence periods (Figure 2). The incubation period occurs in an acute disease after the initial entry of the pathogen into the host (patient).