尊龙赌场网址: True number of U.S. COVID-19 cases likely over 100 mln by end of 2020: study

2021-September-9 09:28 By: 牛牛赌博技巧官#32593;

本文地址:http://873.3355803.com/2021-09/09/content_35150693.htm
文章摘要:尊龙赌场网址,保险暗自颤抖着"EB视讯澳门官网"脸上挂着淡淡高老头神情复杂脖子看似缓慢实则奇快无比。

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

尊龙赌场网址:Disclaimer

The views and opinions expressed in this article are those of the author's, 873.3355803.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

好运来官方直营 欢乐谷娱乐会员管理网 全民彩票下载安装 奔驰宝马娱乐怎么开户 澳门银河娱乐最高返水
每日首存送百分百 玛雅代理官方网 彩票网站平台怎么找的 t6游戏手机版 同升国际ag厅下载
彩拾彩票电子竟枝 发大财 鑫博娱乐注册 开户爱玩彩票 银河体育下载
真人赌博骰宝网址 盛天彩票手机APP 菲律宾申博官网注册 太阳城申博总代理 申博开户登入