The infection's gotten into the blood stream.

Bacteria run amok in the blood stream.

There's a danger of them entering the blood stream.

If they hit the blood stream, we'll be illing.

Sending abundant amounts of adrenaline into your blood stream.

To reach sufficient levels in the blood stream.

To reach sufficient levels in the blood stream.

Then they would affect every organ through the blood stream.

I don't think it's in your blood stream.

They've burrowed deep into your stomach lining and have entered your blood stream.