Vashchënok V S
Parazitologiia. 1979 Jan-Feb;13(1):19-25.
Experimentally infected fleas of X. cheopis are capable of preserving two strains of Y. enterocolitica. One of the strains was found to belong to the 3rd, the other to the 9th serotype. The both strains actively multiplied and accumulated in great amount (up to several millions of microbial cells) in ectoparasites which were maintained at 6 to 8 degrees C. At a temperature of 18 to 21 degrees C some part of fleas gradually became free from the agent that was favoured by their periodical feeding or constant maintenance on the host. In insects infected with the strain of the 3rd serotype the decrease of the infected individuals carried out quicker and was accompanied by the reduction in the number of microbes. The strain of the 9th serotype preserved more steadily and was found in many individuals in amount exceeding the initial level.
实验感染的印鼠客蚤能够保存两株小肠结肠炎耶尔森菌。其中一株属于第3血清型，另一株属于第9血清型。这两株菌在6至8摄氏度饲养的体外寄生虫中均能大量繁殖并积累（多达数百万个微生物细胞）。在18至21摄氏度时，部分跳蚤会逐渐清除病原体，这得益于它们定期进食或持续寄生于宿主。感染第3血清型菌株的昆虫中，受感染个体数量的减少更快，且伴随着微生物数量的减少。第9血清型菌株保存得更稳定，在许多个体中的数量超过初始水平。
