Distribution of Plague in Iran in 1246-47 AH / 1830-31 AD and The Causes of Its Widespread Casualties

Plague is a bacterial infection that is transmitted to other animals and humans through rodents and their infected fleas and is a common disease between humans and animals. This disease has a long history in Iran. The spread of this disease is very wide and almost all parts of Iran have experienced it, however, data on how it occurs in the country is very limited. A plague occurred in Iran in 1246 and 1247 AH, which resulted in huge casualties. In this research, using library resources and documents and in a descriptive-analytical method, the cities affected by this disease and ways and the causes of its transmission have been studied. The result of the research revealed that except for a few other provinces, all Iran and even the holy shrines were involved with it. Simultaneous outbreak of other chronic diseases, outbreak of dangerous type of pulmonary plague, neglect of quarantine and escape to other areas have been the most important factors in the prevalence of this disease.