【摘要】 本文报告了另一个对疫源地内病原体和宿主动物之间的矛盾的研究,目的是为了印证较早的一个研究—疫病流行过程特点中的疫病季节性的研结究果。根据对12头血孢子虫带虫奶牛的血液检查,血孢子虫在牛体内于一年可出现三个高潮期,第一个高潮期出现于三月,第二个高潮期出现于六月,第三个高潮期发生于10月。牛体血孢子虫的季节消长情况分与微小方头蜱在一年内所出现的三个高潮期是基本相吻合的。因此,认为牛体内血孢子虫的季节消长是牛只受到蜱的侵袭有关。这些带虫牛只,虽然在其血液中的血孢子虫数有呈现季节性的升高,但是牛只并不发生血孢子虫病,这种情况与牛只本身具有带虫免疫有关。讨论中指出了带虫现象在维持牛血孢子虫病疫源地方面的重要性。更多还原

【Abstract】 Another study on the contradiction or relationships between the pathogens and host animals of the nidus is reported in the present article. It serves to confirm the results of the study on the seasonal variation of the infection, one of the characteristic features of the course of infection. Upon examination of the blood smears of 12 heads of dairy cows that were haemosporidia carriers, there were three peaks found in a year, the first peak in March, the second one in June while the thirdone in October. The seasonal dynamics of bovine haemosporidia correspond generally with that of the three peaks of Boophilus microplus ticks in a year. Hence it is believed that the seasonal dynamics of haemosporidia in cattle are related to the tick infestation. In spite of the fact that there are seasonal variations of the haemosporidia in the blood stream of the cattle, the animals show no clinieal symptoms. This may, be due to the existence of premunition.It is discussed that the animals,being the components of bioeenosis of. the, nidus, involve not only sick animals but also carriers. It is thought that the latter may be more important epizootiologically than the former.更多还原