Dermacentor nuttallii from Siberia, Rhipicephalus sanguineus from Crimea, a
nd Rh. pumilio from the Astrakhan region were infected with Rickettsia sibi
rica (12%), R. conorii (8%), and the Astrakhan fever agent (3%), respective
ly. Three new Rickettsiae of the R. massiliae genogroup were identified in
ticks by 16S rDNA, gltA, and ompA sequencing.