| http://www.w3.org/ns/prov#value | - Instead, it depended largely on the complex and inefficient mechanisms of the rat carrier and rat-flea vector.37 Moreover, despite two serious epidemics of pneumonic plague in Manchuria in 1911 and 1922, several outbreaks of plague in which Pulex irritans may have been the ectoparasite, and plague deaths resulting from handling skins of marmots, squirrels, cats, and other carriers, or from the con
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