What is the triad of agent, host, environment?

The triad consists of an external agent, a susceptible host, and an environment that brings the host and agent together. In this model, the disease results from the interaction between the agent and the susceptible host in an environment that supports the transmission of the agent from a source to that host.

What are the components of the epidemiologic triad?

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.

How are agent, host, environment and time related?

The interaction and interdependence of agent, host, environment, and time are used in the investigation of diseases and epidemics. time accounts for incubation periods, the life expectancy of the host or the pathogen, and duration of the course of illness or condition.

How is disease related to interaction between agent and host?

In this model, disease results from the interaction between the agent and the susceptible host in an environment that supports transmission of the agent from a source to that host. Two ways of depicting this model are shown in Figure 1.16.

What are the host, agent, and environment factors?

In infectious disease, we tend to talk about the triad of factors which lead to disease. These factors are host, agent, and environment. In human disease, the host is a human, of course, but each human comes with a set of genes, co-existing diseases, nutritional status, and so on.

Who are the members of the epidemiological triad?

This model comprises a susceptible host (the person at risk for the disease ), a disease agent ( the proximate cause ), and an environmental context for the interaction between host and agent. Figure 1: The Epidemiological Triad

Which is the best description of the triad?

The Epidemiological Triad The best known, but most dated model of communicable disease is the Epidemiologic Triad (Figure 1). This model comprises a susceptible host (the person at risk for the disease ), a disease agent ( the proximate cause ), and an environmental context for the interaction between host and agent.

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