[change in the habitat of yersinia pestis in the gorno-altaisk natural focus of plague].the paper analyzes the change that occurred in the habitat of the causative agent of plague in its gorno-altaisk natural focus in 1961 to 2012. since 1961 when the plague microbe was found to come from the southern slopes of the saylyugem mountain range, which are located in mongolia, to the northern slopes situated in russia, a gradual expansion of the habitat of yersenia pestis subsp. altaica had commenced in south-eastern altai. during the considered period, the area where epizootic manifesta ...201525812401
[dispersal of the flea ctenophyllus hirticrus and spreading of plague epizooties in gorny altai].gradual dispersion of an abundant flea species ctenophyllus hirticrus specific to the pallas's pika (the main plague carrier), is revealed in the gorno-altai natural plague focus on the territory, occupied by two populations of this lagomorph. spreading of yersinia pestis in these areas took place a short time later the rise of this ectoparasite's abundance. it is supposed that the colonization of these areas by c. hirticrus was one of the factors determined epizooties spreading within the focus ...200717722641
[epizootological role of fleas in the gorno-altai natural plague focus (a review)].epizootological role of fleas in the gorno-altai natural plague focus (sailugemsk focus) and numerous data on the flea viability are analyzed and generalized. information concerning the flea natural infectivity with yersinia pestis altaica is represented. ecological peculiarities of some flea species parasitizing the main host, mongolian pika ochotona pallasi, and nature of their interrelations with y. pestis are investigated. it is shown that the flea taxocenosis provides the permanent all year ...200415493280
[differences in the blocking of the proventriculus in male and female xenopsylla cheopis (siphonaptera: pulicidae)].frequency of block formation was studied in xenopsylla cheopis infected with the triptophan-dependent and the typical strains of yersinia pestis from the mountain-altai natural plague focus. it was shown that the rate of blocked males in comparison with that of females was statistically higher. in experiments with the triptophan-dependent strain the frequency of blocking in males was 40.9% and exceeded that in females at four times. the highest rate of blocked males was marked at 7-10th and that ...200010750156
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