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The Logic Behind A 14-Day Quarantine After Travel Or COVID-19 Exposure : Shots - Health News What's behind the "14 days of self-quarantine" guidance after exposure to someone with COVID-19 or after travel from a place with a high number of cases? Think of yourself as a potential incubator.
NPR logo The Science Behind A 14-Day Quarantine After Possible COVID-19 Exposure

The Science Behind A 14-Day Quarantine After Possible COVID-19 Exposure

A sign on the M8 motorway last week in Glasgow, Scotland. Jeff J. Mitchell/Getty Images hide caption

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Jeff J. Mitchell/Getty Images

北京朝阳东坝引入建筑垃圾资源化生产线

Jeff J. Mitchell/Getty Images

To stop the spread of the coronavirus, health officials have a favorite refrain: After being in a city or region where there have been a lot of COVID-19 cases, spend 14 days in quarantine even if you feel perfectly fine — don't leave your house. Coming from New York? 14-day quarantine. Arriving in Hawaii? 14-day quarantine. Been in Italy or China or Iran recently? 14-day quarantine.

"That's a long-standing public health practice, and it's called 'traveler's quarantine,' " explains Lindsay Wiley, a professor at American University's Washington College of Law. "Fourteen days is not a made-up number here — it's based on what we know so far about COVID-19, and it's possible that over time we'll see that number change as we learn more [about the virus]."

The 14-day rule is widespread because public health agencies around the world work together on these guidelines. In the U.S., the 报告称全球半数非法木材流入中国:加工成家具销欧美 the quarantine period, and its counterpart organizations do so abroad, all in concert with the World Health Organization.

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But only 14,000 tourists took advantage of the visa-free stopover, according to the Beijing General Station of Exit and Entry Frontier Inspection, well short of the 20,000 target officials had previously predicted.

As of mid-July, there were about 50,000 stores running on Bigcommerce, which have collectively sold close to $4 billon using the platform. The developer has typically added new customers one-by-one. However, a deal it struck in early July with eBay positions its service as the preferred migration path for two Magento products that will be discontinued in February 2015, Go and ProStores. Bigcommerce previously migrated more than 5,000 merchants off ProStores, and the deal could potentially bring up to 10,000 more.

The increase of these and other gases from human activity has caused the planet to warm by about 1.5 degrees Fahrenheit since the preindustrial era, which is causing land ice to melt all over the world. The oceans are rising at what appears to be an accelerating pace, and heat waves and torrential rains are intensifying.
智能手机和电脑代表了20世纪科技发展的驱动力,任何人只要看到它们,就会打消对上述这句话的疑虑。
4. Rihanna
Despite car and truck sales that motored past 16 million for the first time since 2007, recalls dominated the news for most of the year. General Motors GM 1.42% held center stage, dealing with cascading revelations about faulty ignition switches and recalling millions of vehicles. While GM opted for something approaching full disclosure of its missteps , publishing an report into company-wide fumbles, Japanese airbag maker Tanaka chose to stonewall. It left any remedies up to its beleaguered customers, notably Honda and Toyota. They are the ones who deal with the fallout of exploding safety devices that fatally fired shrapnel throughout the passenger compartment.
com共同,bat打,击-共同打-战斗com bat:共同生活的bat蝙蝠,免不了要combat
During Monday night’s debate Mr Rutte reiterated that he would not form a coalition government with Mr Wilders’ party, even ruling out forming a government that relied on support from the anti-immigration party. “I’m not going to work with such a party again,” said Mr Rutte, whose first minority government was propped up by PVV after the 2010 elections.
vt. 妥协处理,危
Chris Washington, played by London-born Daniel Kaluuya, is drawn into the sinister underbelly of a small American community.

"The incubation period varies from virus to virus and sometimes from host to host," says Rachel Graham, a virologist at the University of North Carolina's Gillings School of Global Public Health.

For the virus that causes COVID-19 — its official name is SARS-CoV-2 — researchers have found that the typical incubation period is about five days. About 97% of the people who get infected and develop symptoms will do so within 11 to 12 days, and about 99% will within 14 days.

Canadian border agents are handing people entering Canada a sheet from the Public Health Agency of Canada that instructs them to self-quarantine for 14 days and monitor themselves for any symptoms that might signal COVID-19. Selena Simmons-Duffin/NPR hide caption

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Selena Simmons-Duffin/NPR

爆发冲突的潜在可能性,将迫使中国和美国在不断变幻的环境中重新定义各自的角色,双方都对这种环境感到不安。美国大选期间的反华情绪将使紧张气氛加剧。亚洲国家将勾勒出这两个大国的影响力范围,但考虑到各国的利益各有不同,取决于各自的具体关切,联盟的构成也将变化。
朴雅卡 乔普拉

活跃的ETF市场将取决于基于收费的分销网络的发展。富达国际(Fidelity International)亚太区董事总经理陶博宏(Mark Talbot)表示,分销基础设施正抑制零售需求。
“尽管大多数中国品牌在国外还不为人知,但在国内,它们打下了很深的基础,”胡润百富董事长兼首席调研员胡润说。
与此同时,国内互联网用户已经养成了手机支付的习惯,去年用手机支付的用户数量飙升到了4.69亿,同比前一年增长了31.2%。
If all this comes to pass, Huberty estimates that Apple's addressable smartphone market in China, which had dwindled to 10%, could triple to nearly 30%.

Tsinghua University came in at 45th place, as the third-highest ranked university in Asia. Peking University took the 57th place in the rankings. Zhejiang University took 67th place in its first appearance in the top 100.
Nicole Kidman had daughter Sunday Rose at age 40, with her husband, the country singer Keith Urban. 妮可·基德曼40岁时和其丈夫,乡村歌手凯斯·厄本生下女儿桑迪·
2.The Tianjin Explosions
The fundamentals of the Chinese economy remain sound, the capital adequacy ratio and provision coverage of commercial bans remain high, and we have many financial tools and instruments that can be used. We have the confidence, the ability, and the means to forestall systemic risks.
统计数据显示,在2009年之前,全球研发支出以每年约7%的速度增长,但在2014年放缓了4%。

An illustration created at the U.S. Centers for Disease Control and Prevention conveys a likeness of the coronavirus that's behind the current pandemic. CDC hide caption

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CDC

一个问题接着一个问题,从伊朗制裁到从阿富汗撤军,他的位置和政府态度之间的差别不大,但罗姆尼坚持他将更有效地加强美国的力量。
Dachis: JetBlue started the year with some tough moments (a pilot’s panic attack gave them a rough start), but customer satisfaction and excellent social service during the busy holiday travel season carried the brand to success in 2012.

CDC

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谎言9:对,我在高中足球队里就是个捣蛋鬼!说谎原因:我想让自己在别人的眼里更加闪亮。

鹈鹕一直在费力的吸引并留下自由球员,他们必须在这个夏天留下朱-霍勒迪,考辛斯的家乡在附近的阿拉巴马,而且他和安东尼-戴维斯是密友,同时,多个令人沮丧和伤病困扰的赛季让鹈鹕一直在失败的循环中摇摆。
7. An unexpected new lung function has been found. Researchers have found that lungs don't just facilitate respiration - they also play a key role in blood production, with the ability to produce more than 10 million platelets (tiny blood cells) per hour. That equates to the majority of platelets in circulation at any given moment.
Funded partly by firms and companies, the charity places top graduates in schools serving low-income communities for at least two years, knowing full well that many of them will leave the profession at the end of this period.
Obama scored narrow wins in Ohio, Wisconsin, Iowa, Pennsylvania and New Hampshire - all states that Romney had contested - while the only swing state captured by Romney was North Carolina, according to network projections。

失业率减幅在2015年的下降得可能不会那样的迅速,据经济学家所言,特别是如果更多的人进入劳动力市场由于更容易找到工作。尽管如此和2014年相似的大量招聘和录用将会使低的失业率数据显得更加的可信。
就国内而言,日益活跃的中产阶层正形成压力,要求得到问责制度更健全的治理。愈演愈烈的不平等滋生了一种不公正感;两亿农民工仍然受到二等公民的待遇,腐败也有增无减。对付这些问题的任务十分紧迫,但中国的经济成就助长了一种无端的自信。于是,在阿拉伯之春的刺激下,中国的体制采取激进举措,压制可能引发政治敏感运动的任何社会不满。
此前,跨国房地产经纪机构仲量联行(JLL)的数据显示,2016年全年,中国对外房地产投资额增长了53%,达到创纪录的330亿美元。
研究显示,美国已经取代印度成为反倾销和其他贸易保护案件的最大发起国,而中国及其钢铁行业正是美国的最大目标。

Shipments to China cratered by 14.4 per cent year-on-year to Rmb737.5bn in January. That’s from a 4 per cent drop in December, and versus expectations for a 1.8 per cent rise.
《胡润百富榜》的编制者胡润(Rupert Hoogewerf,见文首图)表示:“姚振华代表了中国金融投资创造财富的新浪潮。”
Andersl?v, Sweden was plagued by residents with green hair. Johan Pettersson discovered that there was too much copper in their water.
Banks, asset managers and insurance companies have flocked from mainland China to acquire prime Hong Kong office buildings, prompting the territory’s government to announce it will release more land for commercial redevelopment in the oversubscribed heart of the city.
法学、工学、医学的毕业生签约月薪较高,平均值分别是5545元、4512元、4500元,同去年相比略有下降,而教育学、农学的毕业生签约月薪偏低,分别为3258元和3184元。

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最佳喜剧类编剧:阿兹?安萨里(Aziz Ansari)和艾伦?杨(Alan Yang),《无为大师》,“父亲母亲” (Master of None, "Parents")
“我还给了他一个直言不讳的同性恋朋友,他会责备邦德,说:‘拜托,邦德,你是生活在20世纪,不是中世纪。’”
short短+en表动词,“变成”→缩短
胡润估计,如果此举获得成功,王健林的净财富可能会猛增至逾500亿美元,令他跻身世界前十大富豪之列。

欧洲出现了债务危机。日本面临自然灾害。曾经是全球亮点的新兴市场也失去了光芒。近来意大利、埃及和泰国等国频现政治危机,这或许表明全球市场可能将出现新一轮动荡。
与2013-2014赛季的世界各大足球联赛相比,本届世界杯的场均进球确实更多。荷甲以场均进球3.2个高居欧洲各大联赛之首,德甲则以3.16个紧随其后。上个赛季,其他联赛的场均进球都没有超过2.8个。目前,美国职业足球大联盟的场均进球为2.89个。
Anyway, it's nice to see that LeBron has filled into his monster physique nicely in the past nine years.
单词discourse 联想记忆:

On Monday the research team said the skeleton confirmed that the monarch had severe scoliosis, or twisting of the spine. It may have been painful and caused his right shoulder to appear higher than his left, but there was no evidence of the withered arm depicted in Shakespeare's "Richard III".
8. Experienced Better Cognitive Performance With Bare Feet
The data showed that Samsung took the top spot, followed by Apple in second place. Even so, the shipments of the two top tech giants declined respectively by 3 percent and 7 percent, demonstrating decreased global market shares.
雷文斯克罗夫特认为,如果他成为一名管理顾问,他的视野可能会相对狭窄。教学工作也有助于他变得愿意承担风险——这来之不易。“如果你曾站在30名会毫不犹豫地指出你的错误的青少年面前讲课,这种体验可能会让你变得愿意去尝试。”
China purchased 141,000 industrial robots in 2017, up 58.1% year-on-year, but foreign brands accounted for nearly three quarters of that, showing that the gap is still widening between Chinese robot makers and their foreign peers.
之后,女孩回头并踮起脚尖轻轻亲吻了男子的脸颊,旁边的人群顿时高声欢呼起来。

就算利润率更低(比如40%),并且替代率为1/3(即全价iPhone的客户流失三分之一),低价iPhone也能提高苹果的营收和毛利润(见上表)。
?There's generally booze wherever 007 goes and alcohol does lead to sex. Liking alcohol was the biggest indicator of who has sex on the first date.
年龄:31岁

'In the next 12 to 24 months, unless any of these bottlenecks are solved, we could see WTI going down to $50 a barrel, to incentivize producers to slow down,' she said
People have been predicting consolidation in this very fragmented sector for years and there have indeed been big mergers recently. But there is little doubt that price pressures on City law firms are intensifying.
之后,女孩回头并踮起脚尖轻轻亲吻了男子的脸颊,旁边的人群顿时高声欢呼起来。
触摸屏主要生产商蓝思科技的周群飞以450亿元的资本净值位列榜单第3。
Set in 1950's London, Reynolds Woodcock is a renowned dressmaker whose fastidious life is disrupted by a young, strong-willed woman, Alma, who becomes his muse and lover.