These were the key to the action of the virus, or so everyone thought.

He knew they were thinking of the virus in their own systems.

This means they cannot make all of the virus leave a person's body.

You have high levels of the virus in your blood.

So you can't use the system to produce a lot of virus.

It was probably some kind of virus, the doctor told him.

The source of the virus in nature is not known.

In the early days of the virus they had seen mostly death.

At the same time, the level of virus in his blood dropped 99.8 percent.

"Could there be some kind of general virus doing all this?"