First, he had to make a blood test for the virus.

I would have to study the entire system to find the right place for the virus.

So far we have had no success with our search for the virus.

Few of them want to be tested for the virus.

Ten times since then, he has had himself tested for the virus.

These are all needed for the virus to make copies of itself.

All it takes is a little break in the skin for the virus to enter the system.

Why not let him help you find a cure for the virus?

Her son tested positive for the virus when he was around 2, she said.

You need a flu shot for the current virus each year.