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Disease Description
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The epidemiologic triangle (triad model) explains that infectious diseases are produced from the interaction of a causative agent, susceptible animal (host), and environmental surrounding. More attentionally, transmission of the causative agent results when the agent leaves its animal (host or reservoir) through a way of escape (portal of exit), is produced by some means of transmission, and enters through a specific entrance (portal of entry) to infect a susceptible animal. This cycle is sometimes called the chain of infection. https://www.intechopen.com/books/bacterial-cattle-diseases/introductory-chapter-bacterial-cattle-diseases-economic-impact-and-their-control
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