something that spreads and causes harm and illness in people or animals, or destroys data on a computer

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Sergeant Jeffords searched the internet for “undiscovered muscle.”

Ten thousand years ago, a deadly virus arose in northeastern Africa.

And there isn't anything they can do about it.

The unlucky infected developed fevers, vomiting, and rashes.

And the doctors don’t — they don’t know what it is.

The virus spread through the air, attacking the skin cells, bone marrow, spleen, and lymph nodes of its victims.

A virus got on the server and sent all of us an email with everyone’s search histories.