When did the virus take hold in the human population?

Once these infected words are said and understood, the virus takes hold of the host.

Once the virus has taken hold, you may as well lie back and enjoy it.

The odds that the virus will take hold here are thought to be low.

Once the virus has taken hold, it is hard to shake it off.

Next, a virus must take control of the host cell's replication mechanisms.

This reactivation takes two to five days, he said, by which time the virus could have taken hold.

Researchers also recognize that the virus can take decades to damage the liver.

The virus takes a much greater toll in developing countries, where it is often passed from mothers to newborn children.

In order to hear the rest of the song, the players will have to let the virus take its course.