Add to ORKGThe author is interested in the following problem: "during great epidemics there are abundant, if not exact records of prevalence, and the resulting mortality can be determined with fair precision, even though a large proportion of the deaths are classified under diagnoses other than influenza. In the intervals between epidemics influenza becomes inextricably confused with other respiratory diseases, having a general clinical resemblance but no definite etiologic entity, so that the record of prevalence and even of mortality is virtually lost." The author therefore looks to what is recorded––i.e. mortality––during previous years in an attempt to gain a sense of the prevalence of influenza. The aim is to better contextualize the prevalence o...