[ocfnash]

Most viruses are bacteriophages, so I imagine bacteria would run wild!

[zahlman]

Aren't bacteria generally much larger than viruses?

[karolinepauls]

Phages don't devour bacteria, they get inside and hijack them, like viruses tend to do with cells.

[melagonster]

Sometimes when phages get enough copies inside bacteria. The host will explode and release all phages inside it.

[zahlman]

Seems strange to call them that, then; but such is English I suppose.