Vashchenok V S, Avtushenko L A
Parazitologiia. 1979 Sep-Oct;13(5):503-9.
In infected fleas the agent of intestinal yersiniosis underwents a complex cycle of quantitative changes after each feeding. A species belonging of blood consumed greatly affected the dynamics of the agent abundance. The general peculiarity of the development of microbes in insects, which fed on various animals (white mice, Sirian hamsters, white rats and guinea pigs), is characterized by the decrease in the abundance of the agent during the first hours after feeding. This was followed by an active multiplication of microbes replaced by a new fall after which the abundance maintained on the level close to the initial one. A comparison of obtained results with the data on the digestion in fleas has shown that the phases of the primary dying off and depression of the agent falls within the intensive-decay of the food clot. The active multiplication proceeds at the end of digestion that may be promoted by the decrease in the fermentative activity and abundance of products of blood decay easily assimilated by microbes. The next fall in the agent's abundance and the absence of multiplication are associated with the exhaustion of the nutrient medium in the process of absorbtion and vital activity of microbes.
在受感染的跳蚤中，肠道耶尔森氏菌病病原体在每次进食后都会经历一个复杂的数量变化周期。所吸食血液的动物种类对病原体数量动态有很大影响。以各种动物（小白鼠、叙利亚仓鼠、大白鼠和豚鼠）为食的昆虫体内微生物发育的一般特点是，进食后的最初几个小时内病原体数量减少。随后是微生物的活跃增殖，之后又出现新的数量下降，随后数量维持在接近初始水平。将所得结果与跳蚤消化的数据进行比较表明，病原体最初死亡和数量减少的阶段与食物凝块的强烈分解阶段相吻合。活跃增殖发生在消化末期，这可能是由于发酵活性降低以及微生物易于同化的血液分解产物数量减少所致。病原体数量的下一次下降以及不再增殖与微生物吸收和生命活动过程中营养介质的耗尽有关。
