Name: 冠状病毒正在变异这是我们所知道的（The Coronavirus Is Mutating. Here’s What We Know | WSJ）
Uploaded: 2021-05-30T10:28:47.000Z
Duration: 6 min 22 s
Description: 【看影片學英語】數萬部 YouTube 影片，搭配英漢字典即點即查，輕鬆掌握單字發音與用法，長久累積看電影不必再看字幕。

including the UK, South Africa, Nigeria and Brazil

- British officials imposed a new lockdown across England.

- Recent reports of a highly contagious coronavirus variant

that some of these variants are highly transmissible

and at least one may reduce how well vaccines work.

Like other viruses, the coronavirus spreads

by infecting cells and then reproducing within them,

creating copies of itself that spread throughout the body.

As new versions are made, the virus' genetic code,

for building new virus particles is copied over

But the code isn't always reproduced correctly.

If the new version of the virus has mutations

where some of the newest ones were first found.

Current data suggests that the UK variant

scientists run a series of experiments in the lab.

- Genetic sequencing gets to the blueprint

- [Narrator] To do this, scientists take a sample

of the mutated virus and sequence its genes.

We can either start working with clinical islets

of that virus or we can actually make the strains.

into the backbone of viruses that we already have.

- What we do is we compare how well the virus replicates

We will just do infections and kind of measure the level

of the virus over time in these cell types.

And the other thing that we'll do is a competition,

the original strain and 50% of the mutant strain

that advantage 24 hours or after 48 hours,

researchers can also test whether human antibodies created

are effective at fighting the new form of the virus.

scientists typically move on to animal models

but scientists are beginning to get a clearer picture

From sequencing, they know the UK variant

- [Narrator] This has a lot to do with the spike protein,

which is critical to how the virus spreads.

A portion of the spike bonds to a receptor

on human cells like a key fitting into a lock.

Scientists found that the UK variant's spike proteins

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冠状病毒正在变异这是我们所知道的（The Coronavirus Is Mutating. Here’s What We Know | WSJ）

individual

pandemic

critical

determine