[An experimental study of the ability of the hybrid crosses of Citellophillus tesquorum fleas of 2 subspecies to transmit the causative agent of plague].

The ability to transmit of plague bacillus was studied in the first-, third- and fourth-generation hybrids bred from C.t.altaicus and C.t.sungaris. The fleas were inoculated with two virulent strains from the Tuva and Transbaikal natural foci of plague. The bacillus was demonstrated to infect the hybrids, form gizzard block, and be transmitted to white mice, causing the animals' death.