The formidable virus once seemed almost beyond the reach of chemicals or vaccines.

Neither the virus nor the Spurs seemed to have any impact once the game started.

Another concern was that the virus seemed to mutate to develop resistance to the drug.

As strong if subtle agents for change, "viruses seem to have been important forces in evolution," he says.

For one thing, "the virus seems to prefer these animals, for some reason."

By that description, a virus seems more like a chemistry set than an organism.

This virus seems to be happy with the genes it's got.

Experts say the effort is crucial because the virus now seems to be spreading relatively rapidly in women.

The cells are infected, but the virus seems to be in a state of suspended animation.

Scientists say they are not sure why the viruses seem to land on genes.