One, two, three, skinned patients.

Yeah.

Man, every time I think I get to stop talking about COVID, they keep pulling me back in.

This time it's the Delta variant.

Let's talk about this.

The reason I want to do a video is my parents asked me about this.

They're both fully vaccinated with the Pfizer vaccine and they're watching the news and

they're freaking out like a lot of people are getting a lot of messages.

What is the Delta variant?

It is a new series of mutations that has become in many parts of the world, the dominant

strain of circulating coronavirus.

How does that happen?

It's really quite simple.

The virus doesn't have any intelligence.

It's not making decisions.

It's just as it replicates in humans, it suffers mutations, changes in its RNA genetic

code.

It turns out that some of those mutations make the virus less likely to succeed in the

world and some make it more likely.

It turns out that as the pandemic evolves, the more replication you have, the more chances

you have to select for a virus that's got more fitness.

It's more able to either reproduce at a higher viral load.

...