男友太凶猛1v1高h,大地资源在线资源免费观看 ,人妻少妇精品视频二区,极度sm残忍bdsm变态

Global EditionASIA 中文雙語Fran?ais
World
Home / World / Europe

Coronavirus patients most infectious when they first show symptoms: WHO

Xinhua | Updated: 2020-06-10 09:03
Share
Share - WeChat
Maria Van Kerkhove, Technical Lead of the World Health Organization (WHO) Health Emergencies Programme attends a news conference on the outbreak of the coronavirus disease (COVID-19) in Geneva, Switzerland, March 16, 2020. [Photo/Agencies]

GENEVA - Studies show people with the coronavirus are most infectious just at the point when they first begin to feel unwell, World Health Organization (WHO) experts said on Tuesday.

This feature has made it so hard to control spread of the virus that causes COVID-19 disease, but it can be done through rigorous testing and social distancing, they said.

"It appears from very limited information we have right now that people have more virus in their body at or around the time that they develop symptoms, so very early on," Maria van Kerkhove, a WHO epidemiologist and technical lead on the pandemic, told a live session on social media.

Preliminary studies from Germany and the United States suggest that people with mild symptoms can be infectious for up to 8-9 days, and "it can be a lot longer for people who are more severely ill", she said.

Earlier, some disease experts questioned her statement on Monday that transmission of COVID-19 by people with no symptoms is "very rare", saying this guidance could pose problems for governments as they seek to lift lockdowns.

Van Kerkhove, citing disease-modelling studies, clarified on Tuesday that some people do not develop symptoms, but can still infect others.

"Some estimates of around 40 percent of transmission may be due to asymptomatic (cases), but those are from models. So I didn't include that in my answer yesterday but wanted to make sure that I made that clear," she said.

Dr. Mike Ryan, WHO's top emergencies expert, said that the novel coronavirus lodges in the upper respiratory tract, making it easier to transmit by droplets than related viruses such as SARS or MERS, which are in the lower tract.

"Now as we look at COVID-19, we have an infectious pathogen that is present in the upper airway for which the viral loads are peaking at the time you are just beginning to get sick," he said.

"That means you could be in the restaurant feeling perfectly well and start to get a fever, you are feeling ok, you didn't think to stay home, but that's the moment at which your viral load could be actually quite high," he said.

Ryan added: "And it's because the disease can spread at that moment that the disease is so contagious, that's why it spread around the world in such an uncontained way, is because it's hard to stop this virus."

But some countries have shown that transmission can be brought down to "an acceptable level or even to no level", as New Zealand had recently demonstrated, he said.

Reuters

 

Most Viewed in 24 Hours
Top
BACK TO THE TOP
English
Copyright 1995 - . All rights reserved. The content (including but not limited to text, photo, multimedia information, etc) published in this site belongs to China Daily Information Co (CDIC). Without written authorization from CDIC, such content shall not be republished or used in any form. Note: Browsers with 1024*768 or higher resolution are suggested for this site.
License for publishing multimedia online 0108263

Registration Number: 130349
FOLLOW US
主站蜘蛛池模板: 隆林| 苍南县| 郎溪县| 永嘉县| 沁水县| 砚山县| 伊川县| 青神县| 潞城市| 西昌市| 铜鼓县| 茶陵县| 交城县| 化德县| 长春市| 二连浩特市| 香港 | 云阳县| 河北省| 秦皇岛市| 阿巴嘎旗| 海门市| 广灵县| 玉林市| 吉首市| 宁乡县| 唐海县| 正宁县| 波密县| 射洪县| 海兴县| 清涧县| 汉源县| 太康县| 凤阳县| 遂溪县| 聊城市| 饶河县| 阿巴嘎旗| 富宁县| 突泉县|