Plague Its Cause and the Manner of its Extension, Its Menace, Its Control and Suppression, Its Diagnosis and Treatment

CHAPTER II

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THE CAUSE AND THE MENACE OF PLAGUE 28

Causation of the Disease and its Mode of Conveyance--Types of Plague--Chronic Plague and Immunity in Rats--Flea Conveyance of Plague Bacilli--The Stability of Virulence of Plague Bacilli--Summary of Facts Concerning the Cause and Manner of Extension of Plague.