Epidemiology is the investigation of the frequency and causes of disease occurrence in various populations.
In other words, the incident rate is the proportion of total cases to total exposure of the population to illness. Three frequency measurements are used to describe the frequency of illnesses in a population: incidence, prevalence, and death rates. As we have seen since 2020, pandemics are likely to inflict significant disruption, disease, and poverty. A disease is said to be endemic when it spreads within a population at a typical or anticipated rate. After a disease is becoming more stable and controllable, a pandemic starts to transition into an endemic. A sick organism frequently displays symptoms or indicators that point to its aberrant condition.
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