rickettsia sibirica rickettsia sibirica rickettsia sibirica is a species of rickettsia. this bacterium is the etiologic agent of north asian tick typhus, which is also known as siberian tick typhus. the ticks that transmit it are primarily various species of dermacentor and haemaphysalis. rickettsia sibirica scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: rickettsiales family: rickettsiaceae genus: rickettsia species group: spotted fever group species: r. sibirica binomial name rickettsia sibiricazdrodovskii, 1948 inoculation eschar on popliteal area and discrete maculopapular elements in patient with lymphangitis infected with rickettsia sibirica mongolitimonae