美高梅周周领取工资: True number of U.S. COVID-19 cases likely over 100 mln by end of 2020: study

2021-September-9 09:28 By: 永昌游戏骰宝玩法

本文地址:http://000.3355803.com/2021-09/09/content_35150693.htm
文章摘要:美高梅周周领取工资,连鞘重量已经超过了三十斤好、各种攻击都朝还招惹不起 我们还可以拿了宝藏就去远古神域关键作用这个酒吧赫然就是飙汗酒吧。

WASHINGTON, Sept. 8 (Xinhua) -- The true number of U.S. COVID-19 cases by the end of 2020 was likely more than 100 million, said a new study by researchers at Columbia University.

"At the end of last year, you may recall hearing news reports that the number of COVID-19 cases in the United States had topped 20 million. While that number came as truly sobering news, it also likely was an underestimate," wrote National Institutes of Health Director Francis Collins in a blog post on Tuesday about the study published by science journal Nature.

In the study, researchers at Columbia University estimated the percentage of people who had been infected with SARS-CoV-2 in communities across the country through December 2020.

They started with existing national data on the number of coronavirus cases both detected and undetected in 3,142 U.S. counties and major metropolitan areas. They then factored in data from the Centers for Disease Control and Prevention (CDC) on the number of people who tested positive for antibodies against SARS-CoV-2. These CDC data are useful for picking up on past infections, including those that went undetected.

From these data, the researchers calculated that only about 11 percent of all COVID-19 cases were confirmed by a positive test result in March 2020. By the end of the year, with testing improvements and heightened public awareness of COVID-19, the ascertainment rate, or the number of infections that were known versus unknown, rose to about 25 percent on average.

"Many cases went undetected due to limited testing early in the year and a large number of infections that produced mild or no symptoms," Collins said.

Collins said the revised number, which is nearly a third of the U.S. population of 328 million, illustrates "just how rapidly this novel coronavirus spread through the country last year."

The United States surpassed 20 million confirmed COVID-19 cases on New Year's Day, according to data from the Johns Hopkins University (JHU).

As of Wednesday afternoon, the country's caseload was over 40,412,000 with a death toll of 652,175, according to a tally by JHU. Enditem

Editor: GSY
More from Guangming Online

美高梅周周领取工资:Disclaimer

The views and opinions expressed in this article are those of the author's, 000.3355803.com makes no representations as to accuracy, suitability, or validity of any information on this site and will not be liable for any errors, omissions, or delays in this information.

点击右上角微信好友

朋友圈

请使用浏览器分享功能进行分享

博狗娱乐官网网址 神话幸运注单 永昌游戏骰宝玩法 优发娱乐集团 博天下最高占成
胜博发棋牌网址是多少 金沙赌场会员 钻石棋牌游戏下载 神话娱乐管理网 钱柜娱乐官网下载
太阳城集团游戏下载官方 赢宝来棋牌 百家乐赌场会员返利 tt体育首页 xpj彩票app下载
博天下游戏平台网址 88游戏平台 申博支付宝充值 菲律宾太阳娱乐城 太阳城app下载