New scope on the relationship between rotifers and Biomphalaria alexandrina snails

Shereen Farouk Mossallam; Eglal Ibrahim Amer; Iman Fathy Abou-El-Naga

摘要

Objective: To investigate the effect of rotifer internalization into snail tissue on the development of schistosomes. Methods:Susceptible laboratory-bred Biomphalaria alexandrina (B. alexandrina) snails were exposed to lab-maintained rotifers; Philodina spp., two weeks before and after being infected with Schistosoma mansoni (S. mansoni) miracidia. The consequent histopathological impact on snail tissues and cercarial biology were investigated before and after emergence from snails. Results:Contamination of B. alexandrina snails with philodina, two weeks before miracidial exposure, was found to hinder the preliminary development of S. mansoni cercariae inside the snail tissues. Furthermore, when snails were contaminated with rotifers two weeks post miracidial exposure; growth of already established cercariae was found to be retarded. The consequent influence of internalized rotifers within the snail tissue was clearly reflected on cercarial emergence, activity and infectivity along the four weeks duration of shedding. In the present study, comparison of snail histopathological findings and altered cercarial biology observed between the experimental and control groups indicated that the rotifers may have affected the levels of snail's energy reservoirs, which eventually was found to have had an adverse impact on reproduction, growth and survival of the parasite within the snail host, coupled with its performance outside the snail. Conclusions:In future biological control strategies of schistosomiasis, ritifers should be considered as a parasitic scourge of humanity.

机译：目的：探讨轮虫内化在蜗牛组织中对血吸虫发育的影响。方法：将易感的实验室繁殖亚历山大草（Biomphalaria alexandrina）蜗牛暴露于实验室维护的轮虫。 Philodina spp。，在曼氏血吸虫（S. mansoni）miracidia感染前后两周。从蜗牛出现之前和之后，研究了其对蜗牛组织和子宫颈生物学的组织病理学影响。结果：在虫暴露前两周，费城氏菌污染了亚历山大藻（B. alexandrina）蜗牛，这阻碍了蜗牛组织内尾man链球菌的初步发育。此外，当蜗牛在轮状病毒暴露后两周被轮虫污染时;发现已经建立的尾c的生长受到阻碍。蜗牛组织内内生轮虫的随后影响清楚地反映在脱落的四个星期内小肠的出现，活性和感染性。在本研究中，比较实验组和对照组的蜗牛组织病理学发现和改变的子宫颈生物学表明，轮虫可能已经影响了蜗牛的储能水平，最终发现它们对生殖，生长和生长有不利影响。寄生虫在蜗牛宿主内的存活率，以及其在蜗牛外的表现。结论：在未来的血吸虫病生物防治策略中，应将ritifers视为人类的寄生虫病。

New scope on the relationship between rotifers and Biomphalaria alexandrina snails

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