All 3 Uses

virus
in
Nineteen Minutes
(Auto-generated)

A murmur spread virally through the courtroom, something that always happened in the wake of hearing that not-guilty plea, and that always seemed ridiculous to Alex-what was the defendant supposed to do?†
Chpt 1
Frankly, I think all we're passing along is some viral crud.†
Chpt 1 *
He fussed over her as if she had mono or cancer, not just a virus, which is what she'd told him when he called her on his cell from school that morning.†
Chpt 1

Definitions:

(1) (virus as in: Covid 19 virus)
a tiny infectious agent that causes disease by invading living cells and using them to make more copies of itself

Although viruses contain genetic material, they can only reproduce by hijacking the reproductive machinery of a cell they invade.
(2) (virus as in: computer virus)
a type of software that spreads without invitation between computers and causes damage to data and software

Computer viruses are so-named because like a biological virus, they contain instructions on how to reproduce, but require the infected computer to actually execute the instructions.
(3) (viral as in: it went viral)
spreading rapidly and widely -- especially through the internet or social media
(4) (meaning too rare to warrant focus)