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常见助产蟾蜍蛙病毒首先在光滑蝾螈(Lissotriton vulgaris)的口腔中复制,并表现出明显的与株相关的致病性。

Common midwife toad ranaviruses replicate first in the oral cavity of smooth newts (Lissotriton vulgaris) and show distinct strain-associated pathogenicity.

机构信息

Utrecht University, Utrecht, the Netherlands.

Dutch Wildlife Health Centre, Utrecht, the Netherlands.

出版信息

Sci Rep. 2019 Mar 14;9(1):4453. doi: 10.1038/s41598-019-41214-0.

Abstract

Ranavirus is the second most common infectious cause of amphibian mortality. These viruses affect caudates, an order in which information regarding Ranavirus pathogenesis is scarce. In the Netherlands, two strains (CMTV-NL I and III) were suspected to possess distinct pathogenicity based on field data. To investigate susceptibility and disease progression in urodeles and determine differences in pathogenicity between strains, 45 adult smooth newts (Lissotriton vulgaris) were challenged via bath exposure with these ranaviruses and their detection in organs and feces followed over time by PCR, immunohistochemistry and in situ hybridization. Ranavirus was first detected at 3 days post infection (p.i.) in the oral cavity and upper respiratory mucosa. At 6 days p.i, virus was found in connective tissues and vasculature of the gastrointestinal tract. Finally, from 9 days p.i onwards there was widespread Ranavirus disease in various organs including skin, kidneys and gonads. Higher pathogenicity of the CMTV-NL I strain was confirmed by higher correlation coefficient of experimental group and mortality of challenged animals. Ranavirus-exposed smooth newts shed virus in feces intermittently and infection was seen in the absence of lesions or clinical signs, indicating that this species can harbor subclinical infections and potentially serve as disease reservoirs.

摘要

蛙壶菌是导致两栖动物死亡的第二大常见传染性病原体。这些病毒会影响尾索动物亚门,而有关蛙壶菌发病机制的信息却很少。在荷兰,根据实地数据,两种毒株(CMTV-NL I 和 III)被怀疑具有不同的致病性。为了研究蝾螈对蛙壶菌的易感性和疾病进展,并确定不同毒株之间的致病性差异,通过浸泡实验用这两种蛙壶菌对 45 只成年光滑雨蛙( Lissotriton vulgaris )进行攻毒,然后通过 PCR、免疫组织化学和原位杂交技术,随时间检测各器官和粪便中的病毒。攻毒后 3 天,在口腔和上呼吸道黏膜中首次检测到蛙壶菌。攻毒后 6 天,在胃肠道的结缔组织和脉管系统中发现了病毒。最后,从攻毒后 9 天开始,在包括皮肤、肾脏和性腺在内的各种器官中出现了广泛的蛙壶菌病。CMTV-NL I 毒株的高致病性通过实验组的相关系数更高和受感染动物的死亡率来证实。暴露于蛙壶菌的光滑雨蛙会间歇性地从粪便中排出病毒,在没有病变或临床症状的情况下也能检测到感染,这表明该物种可能携带亚临床感染,并可能成为疾病的储主。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e1af/6418247/a007ae483bb1/41598_2019_41214_Fig1_HTML.jpg

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