It wasn't until modems became common that virus transmission became a real problem.

The only known means of virus transmission is via planthoppers.

Within two years, technology was developed to protect against virus transmission at conception.

These may appear four to seven days after the initial virus transmission.

Higher activity or populations of aphids favor virus transmission.

Human immunodeficiency virus transmission and the role of other sexually transmitted diseases.

"Even the evidence of one infected bird was a signal of virus transmission that needed to be addressed very aggressively."

The only way to prevent Dengue virus transmission is to avoid being bitten by the disease carrying mosquitoes.

But the risk of virus transmission to patients is so low as to be insignificant, experts say.

But there is an increase in virus transmission among young people and drug addicts who use needles.