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首页> 外文期刊>Parasitology >Mechanisms of mortality in Culicoides biting midges due to Haemoproteus infection
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Mechanisms of mortality in Culicoides biting midges due to Haemoproteus infection

机译：库氏杆菌由于血红蛋白感染而咬咬ges虫的死亡率机制

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摘要

We examined the effects of Haemoproteus infection on the survival and pathology caused in the biting midges. Forty-six females of Culicoides impunctatus were exposed experimentally by allowing them to feed on a naturally infected red-backed shrike infected with Haemoproteus lanii (lineage hRB1, gametocytaemia 5.2%). Seventeen females were fed on an uninfected bird (controls). Dead insects were collected, counted and used for dissection, histological examination and polymerase chain reaction-based testing. Parasites were present in all experimentally infected biting midges, but absent from control insects. Survivorship differed significantly between the control and infected groups. Twelve hours post-exposure (PE), 45 (98%) experimentally infected midges were dead, but all control midges remained alive, and many of them survived until 7 day PE. The migrating ookinetes of H. lanii overfilled midgut, markedly damaged the midgut wall, entered the haemocoel and overfilled the abdomen and thorax of exposed biting midges. Massive infection by migrating ookinetes led to damage of abdomen and thorax of biting midges. The parasites often present in large clumps in the haemocoel in abdomen and thorax, leading to the interruption of the haemolymph circulation. These are the main reasons for rapid death of biting midges after feeding on high-intensity infections of Haemoproteus parasites.
机译：我们检查了血红蛋白感染对叮咬mid的存活和病理的影响。通过实验暴露了46名雌性库库克（Culicoides impunctatus）雌性，它们以自然感染的红背伯劳为食，该伯劳感染了变形血红球藻（谱系hRB1，配子体血症5.2％）。用一只未感染的鸟（对照组）喂养了十七只雌性。收集死昆虫，进行计数，并用于解剖，组织学检查和基于聚合酶链反应的检测。在所有实验性感染的叮咬mid虫中均存在寄生虫，但对照昆虫却没有。对照组和感染组之间的生存率差异显着。暴露后十二小时（PE），有45只（98％）经实验感染的蚊虫死亡，但所有对照蚊虫仍存活，其中许多存活至PE 7天。迁徙的H. lanii的速动子使中肠过满，明显破坏了中肠壁，进入血肠，使腹部和胸腔过满地暴露了叮咬的蚊虫。迁移的行人子宫造成的大规模感染导致腹部受损和mid蚊叮咬。寄生虫通常以大块状存在于腹部和胸部的血小管中，导致血淋巴循环的中断。这些是喂食高强度感染变形杆菌寄生虫后咬咬蚊迅速死亡的主要原因。

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