Case Fatality Rate is expressed as a proportion of which group?

Case Fatality Rate (CFR) is indeed expressed as a proportion of persons diagnosed with the disease. It represents the proportion of individuals who have a specific disease and subsequently die from it within a defined time period. By focusing on those diagnosed, CFR provides a clear picture of the severity and lethality of a disease among those who have been identified as affected.

This measure is primarily useful in assessing the mortality risk associated with a particular disease, especially in outbreak situations, as it gives insights into the effectiveness of treatment, the virulence of the infectious agent, and the overall impact of the disease on those diagnosed. It is important to note that the CFR does not include all individuals with the disease, such as those who may be undiagnosed, nor does it represent the mortality risk for the general population or specific groups like healthcare workers.