Natural History of Disease in Epidemiology

The three factors of the epidemiological triad are agent, host, and environment.

The final outcomes of the pathogenesis phase may include recovery, disability, or death.

By cohort studies.

<p>By studying the natural history of disease in the community setting, the epidemiologist fills gaps in knowledge about disease progression.</p> Signup and view all the answers

<p>The way in which a disease evolves over time from the earliest stage of its prepathogenesis phase to its termination as recovery, disability or death, in the absence of treatment or prevention.</p> Signup and view all the answers

<p>Each disease has its own unique natural history, which may vary among individuals.</p> Signup and view all the answers

<p>By cohort studies.</p> Signup and view all the answers

<p>What the physician sees is just an 'episode' in the natural history of disease.</p> Signup and view all the answers

<p>To understand the pathogenetic chain of events for a particular disease and for the application of preventive measures.</p> Signup and view all the answers

<p>The prepathogenesis phase refers to the period preliminary to the onset of disease in man, where the disease agent has not yet entered man but the factors favoring its interaction with the human host are already existing in the environment.</p> Signup and view all the answers

<p>The agent, host, and environment operating in combination determine not only the onset of disease but also the distribution of disease in the community.</p> Signup and view all the answers

<p>The pathogenesis phase in infectious diseases begins with the entry of the disease agent into the susceptible human host. The agent multiplies, induces tissue and physiological changes, progresses through incubation, early and late pathogenesis, and can lead to recovery, disability, or death.</p> Signup and view all the answers

<p>Intervention measures such as immunization and chemotherapy can modify the pathogenesis phase in infectious diseases.</p> Signup and view all the answers

<p>In chronic diseases, the early pathogenesis phase is referred to as the presymptomatic phase.</p> Signup and view all the answers