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中东呼吸综合征冠状病毒感染在骆驼科动物中。

Middle East respiratory syndrome coronavirus infection in camelids.

机构信息

IRTA, Centre de Recerca en Sanitat Animal (CReSA, IRTA-UAB), Campus de la Universitat Autònoma de Barcelona, Bellaterra, Spain.

Department of Pathology, University of Veterinary Medicine, Hannover, Germany.

出版信息

Vet Pathol. 2022 Jul;59(4):546-555. doi: 10.1177/03009858211069120. Epub 2022 Jan 8.

Abstract

Middle East respiratory syndrome coronavirus (MERS-CoV) is the cause of a severe respiratory disease with a high case fatality rate in humans. Since its emergence in mid-2012, 2578 laboratory-confirmed cases in 27 countries have been reported by the World Health Organization, leading to 888 known deaths due to the disease and related complications. Dromedary camels are considered the major reservoir host for this virus leading to zoonotic infection in humans. Dromedary camels, llamas, and alpacas are susceptible to MERS-CoV, developing a mild-to-moderate upper respiratory tract infection characterized by epithelial hyperplasia as well as infiltration of neutrophils, lymphocytes, and some macrophages within epithelium, lamina propria, in association with abundant viral antigen. The very mild lesions in the lower respiratory tract of these camelids correlate with absence of overt illness following MERS-CoV infection. Unfortunately, there is no approved antiviral treatment or vaccine for MERS-CoV infection in humans. Thus, there is an urgent need to develop intervention strategies in camelids, such as vaccination, to minimize virus spillover to humans. Therefore, the development of camelid models of MERS-CoV infection is key not only to assess vaccine prototypes but also to understand the biologic mechanisms by which the infection can be naturally controlled in these reservoir species. This review summarizes information on virus-induced pathological changes, pathogenesis, viral epidemiology, and control strategies in camelids, as the intermediate hosts and primary source of MERS-CoV infection in humans.

摘要

中东呼吸综合征冠状病毒(MERS-CoV)是一种严重的人类呼吸道疾病,其病死率较高。自 2012 年年中出现以来,世界卫生组织已报告了 27 个国家的 2578 例实验室确诊病例,导致 888 例已知与该病及其相关并发症有关的死亡。单峰驼被认为是该病毒的主要宿主,导致人类发生人畜共患感染。单峰驼、羊驼和骆马易感染 MERS-CoV,会发生轻度至中度上呼吸道感染,其特征是上皮增生,以及上皮内、固有层内中性粒细胞、淋巴细胞和一些巨噬细胞浸润,同时存在大量病毒抗原。这些骆驼类动物下呼吸道的非常轻微病变与 MERS-CoV 感染后无明显疾病相一致。不幸的是,目前尚无针对人类 MERS-CoV 感染的批准抗病毒治疗或疫苗。因此,迫切需要在骆驼类动物中开发干预策略,例如接种疫苗,以最大程度地减少病毒溢出到人类。因此,建立 MERS-CoV 感染的骆驼类动物模型不仅是评估疫苗原型的关键,也是了解这些宿主物种中感染如何自然得到控制的生物学机制的关键。本文综述了骆驼类动物中病毒引起的病理变化、发病机制、病毒流行病学和控制策略方面的信息,因为它们是 MERS-CoV 感染的中间宿主和主要来源。

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