分享

新冠病毒:约翰霍普金斯公共卫生学院问答录!(一)

 睿谈医养 2021-09-06

 聆听世界级公共卫生专家的见解,丰富自己的知识体系!

首先我们必须介绍一下约翰霍普金斯大学彭博公共卫生学院,令读者朋友们了解这个问答录的专业性,让后希望这些问答可以很好地回答大家的疑惑,更加深入地了解新冠病毒!约翰·霍普金斯大学彭博公共卫生学院有一个远大的愿景:保护健康,挽救生命,一次成千上万。自1916年成立以来,彭博公共卫生学院一直在进行先进的研究,教育和实践,以解决世界各地的公共卫生问题。这一百多年来功绩斐然,教师,教职员工和学生帮助消灭了天花,使水可以安全饮用,改善了儿童的存活率,减少了艾滋病毒的传播,并发现了烟草烟雾的危害。

(彭博公共卫生学院)

好闲话少说,笔者这就带大家进入问答实录!

01

我们面对的最严重问题就是:毫无章法的混乱!

'As the media swarms the coronavirus story, most news articles focus on numbers of cases and deaths, new locations of cases, etc. Lost in the shuffle are the important public health insights about how viruses work and humans respond. To help improve understanding of an emerging outbreak’s complex dynamics, GHN has reached outto some of the world’s most respected global health experts for their quick"reality checks" on key issues related to the outbreak.’

       随着媒体一窝蜂的分享这冠状病毒的各种故事,大部分的火力都集中在有多少例病例,又有多少人死亡,又有哪些新的地方发现了病例等等。其实迷失在这些混乱中的真正有意义的公共卫生焦点是病毒的'日常工作状态’是什么,我们人类又是如何应对的?为了帮助人们更好地了解这个复杂多变动态进展的疫情,约翰霍普金斯大学彭博公共卫生学院汇聚了这个世界上最受尊重的全球健康专家,将他们的真知灼见捧给诸君。

(约翰霍普金斯大学彭博公共卫生学院的声音)

02


病毒的传染性问题

问题1 How does a virus shift from zoonotic to human-to-human transmission? (这病毒是如何从动物传染性疾病演进成为人传人的?)回答专家:David Quammen

(人传人也许是因缘际会)

When a virus passes from a nonhuman animalinto a human, we call that moment of spillover a zoonotic transmission. It’s anecological event. What happens next depends on evolutionary potential andchance. If the virus is adaptable, it may succeed in replicating and proliferating in the new human host. Maybe it kills the person and the line of transmission comes to an end there—as happens with rabies. But if the virus is even more adaptable, it may acquire the ability to pass from one human host to another, perhaps by sexual contact (as with HIV), perhaps in bodily fluids such as blood (as with Ebola), perhaps in respiratory droplets launched by coughingor sneezing (as with influenza or SARS). What makes a virus adaptable? The changeability of its genome, plus Darwinian natural selection. Those viruses with single-stranded RNA genomes, which replicate themselves inaccurately and therefore have highly changeable genomes, are among the most adaptable. Coronaviruses belong to that group.

(过程复杂,探案艰难)

当一种病毒从非人类的动物之间的传染跨越到传染人类,我们将这一过程称为动物源传染疾病的溢出。这其实是生态学事件!接下来到底会发生什么全凭进化的可能性与人类的运气。如果病毒的适应能力很强的话,他就会在人类这个新的宿主体内复制增殖,有的时候这一过程本身就会把已经传染的人类个体杀死,继续传播的过程也会因此戛然而止– 比如狂犬病就是这个样子。但是如果病毒的适应能力更加惊人的话,他就可能会获得从一个人继续向另一个人传播的能力,有的时候会主要通过性传播途径(例如艾滋病病毒),有的时候是主要经过体液传播(例如血液传播的埃博拉病毒),有的时候甚至是通过咳嗽、打喷嚏的呼吸道飞沫传播(例如流感病毒、SARS病毒)。那么病毒的适应性从何而来呢?两件事:基因的易变性以及达尔文的进化选择,这主要是因为病毒不能够准确的复制自己所以变化多端,那么哪种病毒是最不稳定,最容易变化的呢?冠状病毒就是了!

(过程如图)

David Quammen is the author of more than a dozen books, including Spillover: Animal Infections and the Next Human Pandemic, and hundreds of articles for publications including National Geographic, The Atlantic, Harper’s, Rolling Stone, and many others.

(戴维 夸曼先生)

戴维 夸曼先生,论著数十本,包括《溢出:动物传染性疾病以及下一场人类瘟疫》,学术论文数百篇,发表于国家地理杂志、美国大西洋月刊、哈珀杂志、滚石杂志等等

(相关著作1)

(相关著作2)

03


疫苗的问题

问题2:How do you go about creating a vaccine against a new virus? (如何着手研制针对新病毒的疫苗?)回答专家:Peter Hotez

(困难加倍,斗志加倍)

Every virus has its unique challenges. Inthe case of n-coronavirus, the vaccine challenges are 2-fold. First, you haveto interfere with the virus’s ability to dock with a specific receptor in thelungs called ACE2.

Then, you need to reduce the problem ofantibody-dependent enhancement. ADE means that some respiratory virus vaccinescan actually make things worse. There are multiple ways to solve this problem.One option is creating a vaccine that only uses parts of the pathogen tostimulate the immune system. One approach is to do this by producingrecombinant protein subunit vaccines. 

We have found that these vaccines that usea part of a protein of the virus (the spike protein) and known as the receptorbinding domain (RBD) are optimal for 2 reasons: Recombinant proteins are astandard technology that has resulted in other licensed vaccines, including thehepatitis B and HPV vaccines; and it’s possible to produce this vaccine inabundance and at low cost.

Moreover, this approach, unlike manyothers, reduces ADE and has a potential for being safe. 

每一种病毒都有其特别的挑战。对于新型冠状病毒来说,疫苗研制的工作难度是翻倍的!首先,你不得不被病毒可以和肺部特殊受体ACE2结合的能力所困扰。

接下来,您还得处理病毒依赖抗体增强的作用问题(ADE)。ADE问题意味着某些呼吸道病毒疫苗可能会让事情变的更糟糕。当然还是有很多解决问题的方式。有一种方案是,利用病原体的一部分来制作疫苗,刺激身体的免疫系统。另一种方法是生产重组蛋白亚单位疫苗。

我们认为最佳的疫苗方案是选择病毒的部分蛋白质(突刺蛋白),这一区域也被认为是RBD(病毒的受体结合区域),具体原因有二:重组蛋白技术已经一种成熟标准的技术广泛运用其他疫苗生产,例如乙肝病毒疫苗及人类乳头瘤病毒疫苗(HPV);第二个原因是因为这种技术生产的疫苗可以用低廉的价格量产!

(疫苗制作的过程)

Peter Hotez, MD, PhD, is dean of the National School of Tropical Medicine at Baylor College of Medicine and Co-Director, Texas Children’s Hospital Center for Vaccine Development.

彼得 霍特兹,医师,博士,贝勒医学院国家热带病学院院长,德克萨斯儿童医院疫苗发展中心总监。

(彼得 霍特兹医生)

04


新冠病毒有什么特殊性?

问题3 How does this particular coronavirus compare with other coronaviruses like SARS and MERS?(这种新型冠状病毒与其他冠状病毒相比有什么特殊性,例如SARS及MERS)回答专家:Tom Frieden

(我们并不十分了解它)

“We are learning more about the virus everyday. On the continuum of the common cold to SARS, it’s now clear that the novelcoronavirus is more contagious than SARS, but less deadly. We don’t yet knowhow much more contagious, or how much less deadly. The number of confirmedinfections with nCoV has already far outpaced the total number of suspectedSARS cases.”

事实上我们每天都能从病毒身上学到新东西。这从普通感冒病毒到SARS一直延续着,现在关于新型冠状病毒比较明确的一点是:它比SARS的传染性更强,但是致死率比较低。但是我们还不知道新冠病毒的传染力到底有多强,致死率到底有多低。目前确诊的新冠病毒患者已经疑似病例确实比SARS更多!

(冠状病毒一直离我们不远)

Tom Frieden is President & CEO ofResolve to Save Lives, an initiative of Vital Strategies, and the formerDirector of the US CDC and Commissioner of the New York City Health Department.

汤姆 弗里登 拯救生命解决方案总裁/首席执行官,关键策略创立;前美国CDC总监;前纽约市卫生局局长

(汤姆 弗里登先生)

扫描二维码

获取医养精彩

关注作者

    转藏 分享 献花(0

    0条评论

    发表

    请遵守用户 评论公约

    类似文章 更多