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Another mortality rate used in public health is the case fatality rate.  It is generally used to represent the severity of the disease.  A disease with a high case fatality rate (like inhalation anthrax) is considered as a very severe disease.

 

The case fatality rate also has a different denominator.  Here the denominator is all persons with the disease.  This is in contrast to other measures where epidemiologists usually consider both the number of persons with disease and the number who are healthy.  The case fatality rate is also a misnomer in name.  It is really a proportion, rather than a rate.