一次咳嗽会产生2万个病毒

 一次咳嗽会产生2万个病毒

The next time you cough or sneeze, there is good reason to cover your mouth.

As many as 20,000 viruses are expelled in an average cough, which may be sufficient to infect many people - particularly those who are not vaccinated¹.

Julian Tang, a consultant² at Singapore's National University Hospital's Division of Microbiology, said as many as 3,000 tiny droplets⁴ are produced in a standard cough.

Using previous research on influenza⁵ viral loads in nasal secretions⁶, and assuming that each coughed airborne droplet³ measures between 1 to 5 micrometers in diameter, that adds up to many, many viruses in a single cough.

"Based on this research and assuming about 3,000 droplets are produced per cough, this range of influenza viruses produced per cough is about 195 to 19,500," Tang said.

He added that this figure of 3,000 droplets refers to those that remain suspended in the air for considerable periods - long enough to infect people.

" Larger droplets carrying influenza viruses may also be produced during a cough, but these will fall to the ground relatively⁷ quickly and will no longer be considered to be significant in the airborne transmission of influenza," he said.

With a new N1N1 influenza virus spreading around the world, governments in many countries have revived advertisements entreating⁸ people to observe personal hygiene⁹.

However, experts are uncertain as to what constitutes an infective dose when it comes to influenza viruses.

But as a guide, previous research has found that it takes just one to 10 organisms to cause viral hemorrhagic fevers, and 10 to 100 organisms to cause viral encephalitis.

今后你咳嗽或打喷嚏时，就有充分的理由捂住嘴了。

据统计，每咳嗽一次平均会释放多达2万个病毒，这足以让很多人感染——尤其是那些没有进行预防接种的人。

新加坡国立大学附属医院微生物科的顾问Julian Tang说，一次普通的咳嗽能产生3000个微滴。

根据此前有关鼻腔分泌物中流感病毒载量的研究，并假设每个咳出的通过空气传播的微滴的直径在1至5微米之间，那么一次咳嗽产生的病毒量就非常之多。

Julian Tang说：“根据该研究，并假设每次咳嗽会产生约三千个微滴，那么一次咳嗽产生的流感病毒量约在195到19500个之间。”

他说，这三千个微滴指的是那些长时间悬浮在空气中微滴——它们存留在空气中的时间足以感染人群。

他说：“咳嗽可能也会产生较大的携带流感病毒的微滴，但这些微滴会相对较快地落到地上，所以对流感在空气中的传播几乎不起作用。”

眼下一种新型的N1H1流感病毒正在全球广泛传播，很多国家的政府纷纷重新打出广告，提醒人们注意个人卫生。

然而，专家们也不能确定多少流感病毒能让人感染。

但此前的研究发现，仅1至10个微生物体就可导致病毒出血热，10至100个微生物即可导致病毒性脑炎，这可作为一个参考。

1 vaccinated   

[医]已接种的，种痘的，接种过疫菌的

参考例句：

• I was vaccinated against tetanus. 我接种了破伤风疫苗。
• Were you vaccinated against smallpox as a child? 你小时候打过天花疫苗吗？

2 consultant   

n.顾问；会诊医师，专科医生

参考例句：

• He is a consultant on law affairs to the mayor.他是市长的一个法律顾问。
• Originally,Gar had agreed to come up as a consultant.原来，加尔只答应来充当我们的顾问。

3 droplet   

n.小滴，飞沫

参考例句：

• The rate of droplet growth under different conditions can be evaluated.可以计算在不同条件下的云滴增长率。
• The test results showed that increasing droplet size was associated with better stability.试验结果表明，增加液滴尺寸将使稳定性提高。

4 droplets   

n.小滴( droplet的名词复数 )

参考例句：

• Droplets of sweat were welling up on his forehead. 他额头上冒出了滴滴汗珠。 来自辞典例句
• In constrast, exhaled smoke contains relatively large water droplets and appears white. 相反，从人嘴里呼出的烟则包含相当大的水滴，所以呈白色。 来自辞典例句

5 influenza   

n.流行性感冒，流感

参考例句：

• They took steps to prevent the spread of influenza.他们采取措施
• Influenza is an infectious disease.流感是一种传染病。

6 secretions   

n.分泌（物）( secretion的名词复数 )

参考例句：

• Lysozyme is an enzyme found in egg white, tears, and other secretions. 溶菌酶是存在于卵白、泪和其他分泌物中的一种酶。 来自辞典例句
• Chest percussion and vibration are used with postural drainage to help dislodge secretions. 在做体位引流时要敲击和振动胸部帮助分泌物松动排出。 来自辞典例句

7 relatively   

adv.比较...地，相对地

参考例句：

• The rabbit is a relatively recent introduction in Australia.兔子是相对较新引入澳大利亚的物种。
• The operation was relatively painless.手术相对来说不痛。

8 entreating   

恳求，乞求( entreat的现在分词 )

参考例句：

• We have not bound your feet with our entreating arms. 我们不曾用恳求的手臂来抱住你的双足。
• The evening has come. Weariness clings round me like the arms of entreating love. 夜来到了，困乏像爱的恳求用双臂围抱住我。

9 hygiene   

n.健康法，卫生学 （a.hygienic）

参考例句：

• Their course of study includes elementary hygiene and medical theory.他们的课程包括基础卫生学和医疗知识。
• He's going to give us a lecture on public hygiene.他要给我们作关于公共卫生方面的报告。