B2 中高級 英國腔 3141 分類 收藏
開始影片後,點擊或框選字幕可以立即查詢單字
字庫載入中…
回報字幕錯誤
Recently there has been a lot of talk about measles.
What does measles actually do, and should you vaccinate against it?
Or is this just hysteria?
Measles is a virus:
a hull of proteins, RNA,
plus some more proteins for reproduction.
It cannot reproduce by itself; it needs a host cell to do so.
To understand measles, we have to understand the immune system.
You might already have seen
the visual system we developed to help here.
Now, let’s focus on the parts of the immune system relevant to measles.
The measles virus enters humans through the nose, mouth, or eyes.
The measles infection starts in the lungs.
Measles is especially good at infecting the body’s first line of defence:
macrophages, powerful guard cells that protect the lungs from intruders.
They enter a cell and take it over.
The virus reprograms the cell and
transforms it into a dangerous virus production center.
Once a cell is filled with viruses,
they leave the crippled cell and begin the cycle over again.
But the immune system has powerful weapons against virus infections:
natural killer cells.
These cells basically patrol the body and check other cells for infections.
If they find an infected cell, they order it to commit suicide.
This is so effective that for the first 10 days or so,
you will not even notice that you’re infected with measles.
And now, the reason why measles is so powerful.
After a period of fighting and dying,
macrophages alert the brain of the immune system:
the dendritic cells.
The job of the dendritic cells is to collect samples of intruders,
travel to the lymph nodes,
and then activate the heavy weapons
that eradicate the infection very fast in a team effort.
But the measles virus uses a dreadful tactic.
It infects the dendritic cells
and uses them as a Trojan horse to enter deeper into the body.
The infected cells travel to the next lymph node
to alert other immune cells.
Once it arrives,
the measles virus spreads around the virgin T and B cells
and infects them.
It attacks the very system that evolved to fight it.
Now, things happen very fast.
The lymph system spreads the virus everywhere
and it enters the bloodstream,
infecting cells while traveling.
Measles infects organs like
the spleen, the liver, the intestines, and, most importantly, the lungs.
The symptoms range from
a very high fever, headache, sickness, bronchitis, and, of course, a rash.
In the lungs, the immune system was doing pretty okay.
But now, millions of viruses attack a second time
and kill countless cells, wiping out the defense systems.
In this phase, you start coughing out millions of measles viruses.
Measles is so contagious at this stage,
that if you meet someone who isn’t vaccinated,
there’s about a 90% chance you’ll infect them.
Without the protective army in the lungs, other bacteria or viruses that
would usually not stand a chance can now enter the lungs and develop into
harmful parallel infections that can cause pneumonia,
the most common way to die from measles.
Your body’s immune system is now seriously wounded.
Various protective systems are hurt and disrupted.
The virus spreads everywhere, infecting the skin all over the body.
The typical measles rash now becomes visible.
And in some cases, the measles virus
reaches the brain and causes a brain infection.
If it does so, the chances of dying are between 20 to 40 percent,
and there may be long-term damage.
But your body is far from giving up at this stage,
and it fights back agressively.
Some dendritic cells survive long enough to activate
the anti-virus forces of the body.
Plasma cells in the lymph nodes start producing billions of antibodies,
tiny proteins that mark infected cells for destruction
or clump the virus together.
Killer T cells flood the body and kill infected cells left and right.
After 2 to 3 weeks, the body usually gets
the upper hand and overwhelms the infection.
But the immune system is now seriously weakened,
and may take weeks or months to recover,
leaving the body vulnerable to other diseases.
But, if you make it, you are now immune:
the immune system remembers the virus forever.
Measles is no joke.
Although 84% of all humans are vaccinated against measles,
122,000 people died because of the infection in 2014.
Some people cannot get vaccinations,
either because they’re too young, because of chemotherapy or HIV,
or because they’re allergic to the vaccine.
They need the rest of us to stop the disease for them.
The measles vaccination is safe, cheap, and available.
There are no benifits from having measles at all.
You don’t strengthen your immune system and it’s not more natural.
Most people who don’t vaccinate only want the best for their children,
which is honorable.
But if you ask yourself,
“Am I putting the life of my child and other children at risk by
not vaccinating against measles?”
The sad answer is yes. Yes, you are.
Let’s not play the blame game, though.
Let’s work together and eradicate this virus.
Together, we can get rid of these dreadful monsters and
consign them to their rightful place: the history books.
Subtitles by the Amara.org community
提示:點選文章或是影片下面的字幕單字,可以直接快速翻譯喔!

載入中…

麻疹概論—需要為它接種疫苗嗎? (Measles Explained — Vaccinate or Not?)

3141 分類 收藏
mommy 發佈於 2015 年 8 月 24 日
看更多推薦影片
  1. 1. 單字查詢

    在字幕上選取單字即可即時查詢單字喔!

  2. 2. 單句重複播放

    可重複聽取一句單句,加強聽力!

  3. 3. 使用快速鍵

    使用影片快速鍵,讓學習更有效率!

  4. 4. 關閉語言字幕

    進階版練習可關閉字幕純聽英文哦!

  5. 5. 內嵌播放器

    可以將英文字幕學習播放器內嵌到部落格等地方喔

  6. 6. 展開播放器

    可隱藏右方全文及字典欄位,觀看影片更舒適!

  1. 英文聽力測驗

    挑戰字幕英文聽力測驗!

  1. 點擊展開筆記本讓你看的更舒服

  1. UrbanDictionary 俚語字典整合查詢。一般字典查詢不到你滿意的解譯,不妨使用「俚語字典」,或許會讓你有滿意的答案喔