In recent decades, alternatives to the established bubonic-plague theory have been presented as to the microbiologcal identity and mechanism(s) of spread of historical plague epidemics. In this monograph, the six important alternative theories are intensively discussed in the light of the historical sources, the central primary studies and standard works on bubonic plague and the alternative microbiological agents, insofar as they are testable. These seven theories are incompatible and at least six of them must be untenable. In the author’s opinion, the arguments against the bubonic-plague theory and for all alternative theories are untenable. This monograph therefore also has been written also as a standard work on bubonic plague, giving a broad and in-depth presentation of the medical, epidemiological and historical evidence and the methodological tenets for identification of historical diseases by comparison with modern medical knowledge.

This monograph represents an expansion and deepening of previous works by Ole J. Benedictow - the author of highly esteemed monographs and articles on the history of plague epidemics and historical demography. In the form of a collection of articles, the author presents an in-depth monographic study on the history of plague epidemics in Scandinavian countries and on controversies of the microbiological and epidemiological fundamentals of plague epidemics.