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. 2021 Jun 16;9:645405. doi: 10.3389/fpubh.2021.645405

Figure 6.

Figure 6

The Susceptible- Infectious (SI) Model is the ingenious model among the disease models. Units are born without immunity which means they are susceptible to all infections. When they will be infected and not given any treatments, then all cases remain life-long infected, and they remained in contact with the susceptible population. This model applies to diseases such as cytomegalovirus (CMV) and herpes.