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一种由非致病性H5N1禽流感病毒株制备的疫苗可使食蟹猕猴对高致病性禽流感病毒感染产生保护性免疫。

A vaccine prepared from a non-pathogenic H5N1 avian influenza virus strain confers protective immunity against highly pathogenic avian influenza virus infection in cynomolgus macaques.

作者信息

Itoh Yasushi, Ozaki Hiroichi, Tsuchiya Hideaki, Okamoto Kiyoko, Torii Ryuzo, Sakoda Yoshihiro, Kawaoka Yoshihiro, Ogasawara Kazumasa, Kida Hiroshi

机构信息

Department of Pathology, Shiga University of Medical Science, Otsu, Shiga, Japan.

出版信息

Vaccine. 2008 Jan 24;26(4):562-72. doi: 10.1016/j.vaccine.2007.11.031. Epub 2007 Dec 3.

Abstract

In order to prepare for the emergence of pandemic influenza viruses, we have established an influenza virus library that contains non-pathogenic influenza A virus strains with 135 combinations of 15 hemagglutinin and 9 neuraminidase subtypes. In this study, we developed a vaccine against H5N1 highly pathogenic avian influenza (HPAI) virus infection in humans using a virus strain selected from the library. We examined its immunogenic potency using cynomolgus macaques as a primate model. Virus antigen-specific antibodies were elicited by intranasal or subcutaneous administration of inactivated whole virus particle vaccines. After challenge with an H5N1 HPAI virus isolate obtained from a Vietnamese patient, the virus was detected only on next day following inoculation in the nasal and/or tracheal swabs of vaccinated macaques that were asymptomatic. On the other hand, the viruses were isolated from nasal and tracheal swabs from non-vaccinated macaques until day 5 and day 7 after inoculation of the H5N1 HPAI virus, respectively. Although six non-vaccinated macaques developed a high body temperature, and two of them lost their appetite after HPAI virus infection, they recovered by the end of the 12-day observation period and did not show the severe symptoms that have been reported in human H5N1 virus infection cases. This demonstrates that the vaccine prepared with the non-pathogenic H5N1 virus from our influenza virus library conferred protective immunity against H5N1 HPAI virus infection to macaques.

摘要

为了应对大流行性流感病毒的出现,我们建立了一个流感病毒库,其中包含具有15种血凝素和9种神经氨酸酶亚型的135种组合的非致病性甲型流感病毒株。在本研究中,我们使用从该病毒库中挑选的病毒株研发了一种针对人类H5N1高致病性禽流感(HPAI)病毒感染的疫苗。我们以食蟹猴作为灵长类动物模型检测了其免疫原性效力。通过鼻内或皮下接种灭活全病毒颗粒疫苗可诱导产生病毒抗原特异性抗体。在用从一名越南患者身上分离得到的H5N1 HPAI病毒株进行攻击后,仅在接种后的第二天,在无症状的接种疫苗的猕猴的鼻腔和/或气管拭子中检测到了该病毒。另一方面,在接种H5N1 HPAI病毒后,分别在未接种疫苗的猕猴的鼻腔和气管拭子中持续分离到病毒,直到第5天和第7天。虽然6只未接种疫苗的猕猴在感染HPAI病毒后出现了高烧,其中2只还食欲不振,但它们在12天的观察期结束时康复,并未表现出人类H5N1病毒感染病例中所报道的严重症状。这表明用我们流感病毒库中的非致病性H5N1病毒制备的疫苗可使猕猴获得针对H5N1 HPAI病毒感染的保护性免疫。

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