Name: Breakthrough Covid-19 Cases Raise Questions About Immunity | WSJ（Breakthrough Covid-19 Cases Raise Questions About Immunity | WSJ）
Uploaded: 2021-07-29T21:40:25.000Z
Duration: 6 min 32 s
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athletes have been the most tested population

on the planet, sometimes providing examples

And as countries around the world continue

This isn't the first we've heard of this.

but it happened to Warriors player Damion Lee.

- [Reporter 1] He will be out at least two weeks.

It was not a false positive as first thought,

- [Reporter 2] Yankees GM Brian Cashman says

for COVID-19 at least two weeks after getting

Do these breakthrough cases mean the vaccines are failing?

They do protect the majority of recipients

- [Narrator] That's what vaccines are designed to do:

But most vaccines, including those created

don't completely protect you from infection.

that breakthrough infections are showing up.

As of July 12th, more than 159 million people in the US

That's one in approximately 29,000 people

but in terms of their overall influence in the pandemic,

than transmission among people who haven't been vaccinated.

- [Narrator] But these cases raise questions

and hint at a future in which it isn't gone completely

including Delta, can partially evade the immune response

against the virus that our body's trying to recognize.

at recognizing and neutralizing those specific threats.

sometimes it doesn't recognize the virus as well.

And so that's how you sort of see it chip away

That's one of the reasons that health officials

in order to prevent the virus from spreading,

but research suggests that full vaccination

is still protective against severe disease and death:

the outcomes that have made COVID-19 so devastating.

What dictates whether someone is more likely

to get infected, even if they're vaccinated?

Dr. Hatziioannou says there are four main variables.

First is the amount of virus that is circulating

- So if a great number of people around you are infected,

of you getting exposed obviously increases.

then the probability of you getting infected increases.

- [Narrator] The second is tied to vaccine uptake.

- So if a large proportion of the population is vaccinated,

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Breakthrough Covid-19 Cases Raise Questions About Immunity | WSJ（Breakthrough Covid-19 Cases Raise Questions About Immunity | WSJ）

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